Merge branch 'master' into michael-sayapin/master

README.md

@@ -68,14 +68,15 @@ message Greeting {
 You can run the following:
 
 ```sh
-protoc -I . --python_betterproto_out=. example.proto
+mkdir lib
+protoc -I . --python_betterproto_out=lib example.proto
 ```
 
-This will generate `hello.py` which looks like:
+This will generate `lib/hello/__init__.py` which looks like:
 
-```py
+```python
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
-# sources: hello.proto
+# sources: example.proto
 # plugin: python-betterproto
 from dataclasses import dataclass
 
@@ -83,7 +84,7 @@ import betterproto
 
 
 @dataclass
-class Hello(betterproto.Message):
+class Greeting(betterproto.Message):
     """Greeting represents a message you can tell a user."""
 
     message: str = betterproto.string_field(1)
@@ -91,23 +92,23 @@ class Hello(betterproto.Message):
 
 Now you can use it!
 
-```py
->>> from hello import Hello
->>> test = Hello()
+```python
+>>> from lib.hello import Greeting
+>>> test = Greeting()
 >>> test
-Hello(message='')
+Greeting(message='')
 
 >>> test.message = "Hey!"
 >>> test
-Hello(message="Hey!")
+Greeting(message="Hey!")
 
 >>> serialized = bytes(test)
 >>> serialized
 b'\n\x04Hey!'
 
->>> another = Hello().parse(serialized)
+>>> another = Greeting().parse(serialized)
 >>> another
-Hello(message="Hey!")
+Greeting(message="Hey!")
 
 >>> another.to_dict()
 {"message": "Hey!"}
@@ -315,7 +316,7 @@ To benefit from the collection of standard development tasks ensure you have mak
 
 This project enforces [black](https://github.com/psf/black) python code formatting.
 
-Before commiting changes run:
+Before committing changes run:
 
 ```sh
 make format
@@ -336,7 +337,7 @@ Adding a standard test case is easy.
 
 - Create a new directory `betterproto/tests/inputs/<name>`
   - add `<name>.proto`  with a message called `Test`
-  - add `<name>.json` with some test data
+  - add `<name>.json` with some test data (optional)
 
 It will be picked up automatically when you run the tests.
 

betterproto/__init__.py

@@ -7,27 +7,22 @@ import sys
 from abc import ABC
 from base64 import b64decode, b64encode
 from datetime import datetime, timedelta, timezone
-import stringcase
 from typing import (
     Any,
-    AsyncGenerator,
     Callable,
-    Collection,
     Dict,
     Generator,
-    Iterator,
     List,
-    Mapping,
     Optional,
     Set,
-    SupportsBytes,
     Tuple,
     Type,
     Union,
     get_type_hints,
 )
-from ._types import ST, T
-from .casing import safe_snake_case
+
+from ._types import T
+from .casing import camel_case, safe_snake_case, safe_snake_case, snake_case
 from .grpc.grpclib_client import ServiceStub
 
 if not (sys.version_info.major == 3 and sys.version_info.minor >= 7):
@@ -124,8 +119,8 @@ DATETIME_ZERO = datetime_default_gen()
 class Casing(enum.Enum):
     """Casing constants for serialization."""
 
-    CAMEL = stringcase.camelcase
-    SNAKE = stringcase.snakecase
+    CAMEL = camel_case
+    SNAKE = snake_case
 
 
 class _PLACEHOLDER:

betterproto/casing.py

@@ -1,9 +1,21 @@
-import stringcase
+import re
+
+# Word delimiters and symbols that will not be preserved when re-casing.
+# language=PythonRegExp
+SYMBOLS = "[^a-zA-Z0-9]*"
+
+# Optionally capitalized word.
+# language=PythonRegExp
+WORD = "[A-Z]*[a-z]*[0-9]*"
+
+# Uppercase word, not followed by lowercase letters.
+# language=PythonRegExp
+WORD_UPPER = "[A-Z]+(?![a-z])[0-9]*"
 
 
 def safe_snake_case(value: str) -> str:
     """Snake case a value taking into account Python keywords."""
-    value = stringcase.snakecase(value)
+    value = snake_case(value)
     if value in [
         "and",
         "as",
@@ -39,3 +51,70 @@ def safe_snake_case(value: str) -> str:
         # https://www.python.org/dev/peps/pep-0008/#descriptive-naming-styles
         value += "_"
     return value
+
+
+def snake_case(value: str, strict: bool = True):
+    """
+    Join words with an underscore into lowercase and remove symbols.
+    @param value: value to convert
+    @param strict: force single underscores
+    """
+
+    def substitute_word(symbols, word, is_start):
+        if not word:
+            return ""
+        if strict:
+            delimiter_count = 0 if is_start else 1  # Single underscore if strict.
+        elif is_start:
+            delimiter_count = len(symbols)
+        elif word.isupper() or word.islower():
+            delimiter_count = max(
+                1, len(symbols)
+            )  # Preserve all delimiters if not strict.
+        else:
+            delimiter_count = len(symbols) + 1  # Extra underscore for leading capital.
+
+        return ("_" * delimiter_count) + word.lower()
+
+    snake = re.sub(
+        f"(^)?({SYMBOLS})({WORD_UPPER}|{WORD})",
+        lambda groups: substitute_word(groups[2], groups[3], groups[1] is not None),
+        value,
+    )
+    return snake
+
+
+def pascal_case(value: str, strict: bool = True):
+    """
+    Capitalize each word and remove symbols.
+    @param value: value to convert
+    @param strict: output only alphanumeric characters
+    """
+
+    def substitute_word(symbols, word):
+        if strict:
+            return word.capitalize()  # Remove all delimiters
+
+        if word.islower():
+            delimiter_length = len(symbols[:-1])  # Lose one delimiter
+        else:
+            delimiter_length = len(symbols)  # Preserve all delimiters
+
+        return ("_" * delimiter_length) + word.capitalize()
+
+    return re.sub(
+        f"({SYMBOLS})({WORD_UPPER}|{WORD})",
+        lambda groups: substitute_word(groups[1], groups[2]),
+        value,
+    )
+
+
+def camel_case(value: str, strict: bool = True):
+    """
+    Capitalize all words except first and remove symbols.
+    """
+    return lowercase_first(pascal_case(value, strict=strict))
+
+
+def lowercase_first(value: str):
+    return value[0:1].lower() + value[1:]

betterproto/compile/importing.py

@@ -1,70 +1,160 @@
-from typing import Dict, Type
-
-import stringcase
+import os
+import re
+from typing import Dict, List, Set, Type
 
 from betterproto import safe_snake_case
+from betterproto.compile.naming import pythonize_class_name
 from betterproto.lib.google import protobuf as google_protobuf
 
 WRAPPER_TYPES: Dict[str, Type] = {
-    "google.protobuf.DoubleValue": google_protobuf.DoubleValue,
-    "google.protobuf.FloatValue": google_protobuf.FloatValue,
-    "google.protobuf.Int32Value": google_protobuf.Int32Value,
-    "google.protobuf.Int64Value": google_protobuf.Int64Value,
-    "google.protobuf.UInt32Value": google_protobuf.UInt32Value,
-    "google.protobuf.UInt64Value": google_protobuf.UInt64Value,
-    "google.protobuf.BoolValue": google_protobuf.BoolValue,
-    "google.protobuf.StringValue": google_protobuf.StringValue,
-    "google.protobuf.BytesValue": google_protobuf.BytesValue,
+    ".google.protobuf.DoubleValue": google_protobuf.DoubleValue,
+    ".google.protobuf.FloatValue": google_protobuf.FloatValue,
+    ".google.protobuf.Int32Value": google_protobuf.Int32Value,
+    ".google.protobuf.Int64Value": google_protobuf.Int64Value,
+    ".google.protobuf.UInt32Value": google_protobuf.UInt32Value,
+    ".google.protobuf.UInt64Value": google_protobuf.UInt64Value,
+    ".google.protobuf.BoolValue": google_protobuf.BoolValue,
+    ".google.protobuf.StringValue": google_protobuf.StringValue,
+    ".google.protobuf.BytesValue": google_protobuf.BytesValue,
 }
 
 
-def get_ref_type(
-    package: str, imports: set, type_name: str, unwrap: bool = True
+def parse_source_type_name(field_type_name):
+    """
+    Split full source type name into package and type name.
+    E.g. 'root.package.Message' -> ('root.package', 'Message')
+         'root.Message.SomeEnum' -> ('root', 'Message.SomeEnum')
+    """
+    package_match = re.match(r"^\.?([^A-Z]+)\.(.+)", field_type_name)
+    if package_match:
+        package = package_match.group(1)
+        name = package_match.group(2)
+    else:
+        package = ""
+        name = field_type_name.lstrip(".")
+    return package, name
+
+
+def get_type_reference(
+    package: str, imports: set, source_type: str, unwrap: bool = True,
 ) -> str:
     """
     Return a Python type name for a proto type reference. Adds the import if
     necessary. Unwraps well known type if required.
     """
-    # If the package name is a blank string, then this should still work
-    # because by convention packages are lowercase and message/enum types are
-    # pascal-cased. May require refactoring in the future.
-    type_name = type_name.lstrip(".")
-
-    is_wrapper = type_name in WRAPPER_TYPES
-
     if unwrap:
-        if is_wrapper:
-            wrapped_type = type(WRAPPER_TYPES[type_name]().value)
+        if source_type in WRAPPER_TYPES:
+            wrapped_type = type(WRAPPER_TYPES[source_type]().value)
             return f"Optional[{wrapped_type.__name__}]"
 
-        if type_name == "google.protobuf.Duration":
+        if source_type == ".google.protobuf.Duration":
             return "timedelta"
 
-        if type_name == "google.protobuf.Timestamp":
+        if source_type == ".google.protobuf.Timestamp":
             return "datetime"
 
-    if type_name.startswith(package):
-        parts = type_name.lstrip(package).lstrip(".").split(".")
-        if len(parts) == 1 or (len(parts) > 1 and parts[0][0] == parts[0][0].upper()):
-            # This is the current package, which has nested types flattened.
-            # foo.bar_thing => FooBarThing
-            cased = [stringcase.pascalcase(part) for part in parts]
-            type_name = f'"{"".join(cased)}"'
+    source_package, source_type = parse_source_type_name(source_type)
 
-    # Use precompiled classes for google.protobuf.* objects
-    if type_name.startswith("google.protobuf.") and type_name.count(".") == 2:
-        type_name = type_name.rsplit(".", maxsplit=1)[1]
-        import_package = "betterproto.lib.google.protobuf"
-        import_alias = safe_snake_case(import_package)
-        imports.add(f"import {import_package} as {import_alias}")
-        return f"{import_alias}.{type_name}"
+    current_package: List[str] = package.split(".") if package else []
+    py_package: List[str] = source_package.split(".") if source_package else []
+    py_type: str = pythonize_class_name(source_type)
 
-    if "." in type_name:
-        # This is imported from another package. No need
-        # to use a forward ref and we need to add the import.
-        parts = type_name.split(".")
-        parts[-1] = stringcase.pascalcase(parts[-1])
-        imports.add(f"from .{'.'.join(parts[:-2])} import {parts[-2]}")
-        type_name = f"{parts[-2]}.{parts[-1]}"
+    compiling_google_protobuf = current_package == ["google", "protobuf"]
+    importing_google_protobuf = py_package == ["google", "protobuf"]
+    if importing_google_protobuf and not compiling_google_protobuf:
+        py_package = ["betterproto", "lib"] + py_package
 
-    return type_name
+    if py_package[:1] == ["betterproto"]:
+        return reference_absolute(imports, py_package, py_type)
+
+    if py_package == current_package:
+        return reference_sibling(py_type)
+
+    if py_package[: len(current_package)] == current_package:
+        return reference_descendent(current_package, imports, py_package, py_type)
+
+    if current_package[: len(py_package)] == py_package:
+        return reference_ancestor(current_package, imports, py_package, py_type)
+
+    return reference_cousin(current_package, imports, py_package, py_type)
+
+
+def reference_absolute(imports, py_package, py_type):
+    """
+    Returns a reference to a python type located in the root, i.e. sys.path.
+    """
+    string_import = ".".join(py_package)
+    string_alias = safe_snake_case(string_import)
+    imports.add(f"import {string_import} as {string_alias}")
+    return f"{string_alias}.{py_type}"
+
+
+def reference_sibling(py_type: str) -> str:
+    """
+    Returns a reference to a python type within the same package as the current package.
+    """
+    return f'"{py_type}"'
+
+
+def reference_descendent(
+    current_package: List[str], imports: Set[str], py_package: List[str], py_type: str
+) -> str:
+    """
+    Returns a reference to a python type in a package that is a descendent of the current package,
+    and adds the required import that is aliased to avoid name conflicts.
+    """
+    importing_descendent = py_package[len(current_package) :]
+    string_from = ".".join(importing_descendent[:-1])
+    string_import = importing_descendent[-1]
+    if string_from:
+        string_alias = "_".join(importing_descendent)
+        imports.add(f"from .{string_from} import {string_import} as {string_alias}")
+        return f"{string_alias}.{py_type}"
+    else:
+        imports.add(f"from . import {string_import}")
+        return f"{string_import}.{py_type}"
+
+
+def reference_ancestor(
+    current_package: List[str], imports: Set[str], py_package: List[str], py_type: str
+) -> str:
+    """
+    Returns a reference to a python type in a package which is an ancestor to the current package,
+    and adds the required import that is aliased (if possible) to avoid name conflicts.
+
+    Adds trailing __ to avoid name mangling (python.org/dev/peps/pep-0008/#id34).
+    """
+    distance_up = len(current_package) - len(py_package)
+    if py_package:
+        string_import = py_package[-1]
+        string_alias = f"_{'_' * distance_up}{string_import}__"
+        string_from = f"..{'.' * distance_up}"
+        imports.add(f"from {string_from} import {string_import} as {string_alias}")
+        return f"{string_alias}.{py_type}"
+    else:
+        string_alias = f"{'_' * distance_up}{py_type}__"
+        imports.add(f"from .{'.' * distance_up} import {py_type} as {string_alias}")
+        return string_alias
+
+
+def reference_cousin(
+    current_package: List[str], imports: Set[str], py_package: List[str], py_type: str
+) -> str:
+    """
+    Returns a reference to a python type in a package that is not descendent, ancestor or sibling,
+    and adds the required import that is aliased to avoid name conflicts.
+    """
+    shared_ancestry = os.path.commonprefix([current_package, py_package])
+    distance_up = len(current_package) - len(shared_ancestry)
+    string_from = f".{'.' * distance_up}" + ".".join(
+        py_package[len(shared_ancestry) : -1]
+    )
+    string_import = py_package[-1]
+    # Add trailing __ to avoid name mangling (python.org/dev/peps/pep-0008/#id34)
+    string_alias = (
+        f"{'_' * distance_up}"
+        + safe_snake_case(".".join(py_package[len(shared_ancestry) :]))
+        + "__"
+    )
+    imports.add(f"from {string_from} import {string_import} as {string_alias}")
+    return f"{string_alias}.{py_type}"

betterproto/compile/naming.py

@@ -0,0 +1,13 @@
+from betterproto import casing
+
+
+def pythonize_class_name(name):
+    return casing.pascal_case(name)
+
+
+def pythonize_field_name(name: str):
+    return casing.safe_snake_case(name)
+
+
+def pythonize_method_name(name: str):
+    return casing.safe_snake_case(name)

betterproto/lib/google/protobuf/__init__.py

@@ -84,7 +84,7 @@ class FieldOptionsCType(betterproto.Enum):
     STRING_PIECE = 2
 
 
-class FieldOptionsJSType(betterproto.Enum):
+class FieldOptionsJsType(betterproto.Enum):
     JS_NORMAL = 0
     JS_STRING = 1
     JS_NUMBER = 2
@@ -717,7 +717,7 @@ class FieldOptions(betterproto.Message):
     # use the JavaScript "number" type.  The behavior of the default option
     # JS_NORMAL is implementation dependent. This option is an enum to permit
     # additional types to be added, e.g. goog.math.Integer.
-    jstype: "FieldOptionsJSType" = betterproto.enum_field(6)
+    jstype: "FieldOptionsJsType" = betterproto.enum_field(6)
     # Should this field be parsed lazily?  Lazy applies only to message-type
     # fields.  It means that when the outer message is initially parsed, the
     # inner message's contents will not be parsed but instead stored in encoded

betterproto/plugin.py

@@ -2,14 +2,19 @@
 
 import itertools
 import os.path
+import pathlib
 import re
-import stringcase
 import sys
 import textwrap
 from typing import List, Union
+
 import betterproto
-from betterproto.casing import safe_snake_case
-from betterproto.compile.importing import get_ref_type
+from betterproto.compile.importing import get_type_reference
+from betterproto.compile.naming import (
+    pythonize_class_name,
+    pythonize_field_name,
+    pythonize_method_name,
+)
 
 try:
     # betterproto[compiler] specific dependencies
@@ -35,27 +40,22 @@ except ImportError as err:
     raise SystemExit(1)
 
 
-def py_type(
-    package: str,
-    imports: set,
-    message: DescriptorProto,
-    descriptor: FieldDescriptorProto,
-) -> str:
-    if descriptor.type in [1, 2]:
+def py_type(package: str, imports: set, field: FieldDescriptorProto) -> str:
+    if field.type in [1, 2]:
         return "float"
-    elif descriptor.type in [3, 4, 5, 6, 7, 13, 15, 16, 17, 18]:
+    elif field.type in [3, 4, 5, 6, 7, 13, 15, 16, 17, 18]:
         return "int"
-    elif descriptor.type == 8:
+    elif field.type == 8:
         return "bool"
-    elif descriptor.type == 9:
+    elif field.type == 9:
         return "str"
-    elif descriptor.type in [11, 14]:
+    elif field.type in [11, 14]:
         # Type referencing another defined Message or a named enum
-        return get_ref_type(package, imports, descriptor.type_name)
-    elif descriptor.type == 12:
+        return get_type_reference(package, imports, field.type_name)
+    elif field.type == 12:
         return "bytes"
     else:
-        raise NotImplementedError(f"Unknown type {descriptor.type}")
+        raise NotImplementedError(f"Unknown type {field.type}")
 
 
 def get_py_zero(type_num: int) -> Union[str, float]:
@@ -131,17 +131,17 @@ def generate_code(request, response):
 
     output_map = {}
     for proto_file in request.proto_file:
-        out = proto_file.package
-
-        if out == "google.protobuf" and "INCLUDE_GOOGLE" not in plugin_options:
+        if (
+            proto_file.package == "google.protobuf"
+            and "INCLUDE_GOOGLE" not in plugin_options
+        ):
             continue
 
-        if not out:
-            out = os.path.splitext(proto_file.name)[0].replace(os.path.sep, ".")
+        output_file = str(pathlib.Path(*proto_file.package.split("."), "__init__.py"))
 
-        if out not in output_map:
-            output_map[out] = {"package": proto_file.package, "files": []}
-        output_map[out]["files"].append(proto_file)
+        if output_file not in output_map:
+            output_map[output_file] = {"package": proto_file.package, "files": []}
+        output_map[output_file]["files"].append(proto_file)
 
     # TODO: Figure out how to handle gRPC request/response messages and add
     # processing below for Service.
@@ -160,17 +160,10 @@ def generate_code(request, response):
             "services": [],
         }
 
-        type_mapping = {}
-
         for proto_file in options["files"]:
-            # print(proto_file.message_type, file=sys.stderr)
-            # print(proto_file.service, file=sys.stderr)
-            # print(proto_file.source_code_info, file=sys.stderr)
-
+            item: DescriptorProto
             for item, path in traverse(proto_file):
-                # print(item, file=sys.stderr)
-                # print(path, file=sys.stderr)
-                data = {"name": item.name, "py_name": stringcase.pascalcase(item.name)}
+                data = {"name": item.name, "py_name": pythonize_class_name(item.name)}
 
                 if isinstance(item, DescriptorProto):
                     # print(item, file=sys.stderr)
@@ -187,7 +180,7 @@ def generate_code(request, response):
                     )
 
                     for i, f in enumerate(item.field):
-                        t = py_type(package, output["imports"], item, f)
+                        t = py_type(package, output["imports"], f)
                         zero = get_py_zero(f.type)
 
                         repeated = False
@@ -222,13 +215,11 @@ def generate_code(request, response):
                                             k = py_type(
                                                 package,
                                                 output["imports"],
-                                                item,
                                                 nested.field[0],
                                             )
                                             v = py_type(
                                                 package,
                                                 output["imports"],
-                                                item,
                                                 nested.field[1],
                                             )
                                             t = f"Dict[{k}, {v}]"
@@ -264,7 +255,7 @@ def generate_code(request, response):
                         data["properties"].append(
                             {
                                 "name": f.name,
-                                "py_name": safe_snake_case(f.name),
+                                "py_name": pythonize_field_name(f.name),
                                 "number": f.number,
                                 "comment": get_comment(proto_file, path + [2, i]),
                                 "proto_type": int(f.type),
@@ -305,14 +296,14 @@ def generate_code(request, response):
 
                 data = {
                     "name": service.name,
-                    "py_name": stringcase.pascalcase(service.name),
+                    "py_name": pythonize_class_name(service.name),
                     "comment": get_comment(proto_file, [6, i]),
                     "methods": [],
                 }
 
                 for j, method in enumerate(service.method):
                     input_message = None
-                    input_type = get_ref_type(
+                    input_type = get_type_reference(
                         package, output["imports"], method.input_type
                     ).strip('"')
                     for msg in output["messages"]:
@@ -326,14 +317,14 @@ def generate_code(request, response):
                     data["methods"].append(
                         {
                             "name": method.name,
-                            "py_name": stringcase.snakecase(method.name),
+                            "py_name": pythonize_method_name(method.name),
                             "comment": get_comment(proto_file, [6, i, 2, j], indent=8),
                             "route": f"/{package}.{service.name}/{method.name}",
-                            "input": get_ref_type(
+                            "input": get_type_reference(
                                 package, output["imports"], method.input_type
                             ).strip('"'),
                             "input_message": input_message,
-                            "output": get_ref_type(
+                            "output": get_type_reference(
                                 package,
                                 output["imports"],
                                 method.output_type,
@@ -359,8 +350,7 @@ def generate_code(request, response):
 
         # Fill response
         f = response.file.add()
-        # print(filename, file=sys.stderr)
-        f.name = filename.replace(".", os.path.sep) + ".py"
+        f.name = filename
 
         # Render and then format the output file.
         f.content = black.format_str(
@@ -368,32 +358,23 @@ def generate_code(request, response):
             mode=black.FileMode(target_versions=set([black.TargetVersion.PY37])),
         )
 
-    inits = set([""])
-    for f in response.file:
-        # Ensure output paths exist
-        # print(f.name, file=sys.stderr)
-        dirnames = os.path.dirname(f.name)
-        if dirnames:
-            os.makedirs(dirnames, exist_ok=True)
-            base = ""
-            for part in dirnames.split(os.path.sep):
-                base = os.path.join(base, part)
-                inits.add(base)
-
-    for base in inits:
-        name = os.path.join(base, "__init__.py")
-
-        if os.path.exists(name):
-            # Never overwrite inits as they may have custom stuff in them.
-            continue
+    # Make each output directory a package with __init__ file
+    output_paths = set(pathlib.Path(path) for path in output_map.keys())
+    init_files = (
+        set(
+            directory.joinpath("__init__.py")
+            for path in output_paths
+            for directory in path.parents
+        )
+        - output_paths
+    )
 
+    for init_file in init_files:
         init = response.file.add()
-        init.name = name
-        init.content = b""
+        init.name = str(init_file)
 
-    filenames = sorted([f.name for f in response.file])
-    for fname in filenames:
-        print(f"Writing {fname}", file=sys.stderr)
+    for filename in sorted(output_paths.union(init_files)):
+        print(f"Writing {filename}", file=sys.stderr)
 
 
 def main():

betterproto/tests/README.md

@@ -12,12 +12,12 @@ inputs/
 
 ## Test case directory structure
 
-Each testcase has a `<name>.proto` file with a message called `Test`, a matching `.json` file and optionally a custom test file called `test_*.py`.
+Each testcase has a `<name>.proto` file with a message called `Test`, and optionally a matching `.json` file and a custom test called `test_*.py`.
 
 ```bash
 bool/
   bool.proto
-  bool.json
+  bool.json     # optional
   test_bool.py  # optional
 ```
 
@@ -61,21 +61,22 @@ def test_value():
 
 The following tests are automatically executed for all cases:
 
-- [x] Can the generated python code imported?
+- [x] Can the generated python code be imported?
 - [x] Can the generated message class be instantiated?
 - [x] Is the generated code compatible with the Google's `grpc_tools.protoc` implementation?
+  - _when `.json` is present_ 
 
 ## Running the tests
 
-- `pipenv run generate`
-  This generates
+- `pipenv run generate`  
+  This generates:
   - `betterproto/tests/output_betterproto` &mdash; *the plugin generated python classes*
   - `betterproto/tests/output_reference` &mdash; *reference implementation classes*
 - `pipenv run test`
 
 ## Intentionally Failing tests
 
-The standard test suite includes tests that fail by intention. These tests document known bugs and missing features that are intended to be corrented in the future.
+The standard test suite includes tests that fail by intention. These tests document known bugs and missing features that are intended to be corrected in the future.
 
 When running `pytest`, they show up as `x` or  `X` in the test results.
 

betterproto/tests/inputs/bool/test_bool.py

@@ -1,4 +1,4 @@
-from betterproto.tests.output_betterproto.bool.bool import Test
+from betterproto.tests.output_betterproto.bool import Test
 
 
 def test_value():

betterproto/tests/inputs/casing/casing.proto

@@ -10,6 +10,7 @@ message Test {
   int32 camelCase = 1;
   my_enum snake_case = 2;
   snake_case_message snake_case_message = 3;
+  int32 UPPERCASE = 4;
 }
 
 message snake_case_message {

betterproto/tests/inputs/casing/test_casing.py

@@ -1,5 +1,5 @@
-import betterproto.tests.output_betterproto.casing.casing as casing
-from betterproto.tests.output_betterproto.casing.casing import Test
+import betterproto.tests.output_betterproto.casing as casing
+from betterproto.tests.output_betterproto.casing import Test
 
 
 def test_message_attributes():
@@ -8,6 +8,7 @@ def test_message_attributes():
         message, "snake_case_message"
     ), "snake_case field name is same in python"
     assert hasattr(message, "camel_case"), "CamelCase field is snake_case in python"
+    assert hasattr(message, "uppercase"), "UPPERCASE field is lowercase in python"
 
 
 def test_message_casing():

betterproto/tests/inputs/casing_message_field_uppercase/casing_message_field_uppercase.json

@@ -1,5 +0,0 @@
-{
-  "UPPERCASE": 10,
-  "UPPERCASE_V2": 10,
-  "UPPER_CAMEL_CASE": 10
-}

betterproto/tests/inputs/casing_message_field_uppercase/casing_message_field_uppercase.py

@@ -1,6 +1,4 @@
-from betterproto.tests.output_betterproto.casing_message_field_uppercase.casing_message_field_uppercase import (
-    Test,
-)
+from betterproto.tests.output_betterproto.casing_message_field_uppercase import Test
 
 
 def test_message_casing():

betterproto/tests/inputs/config.py

@@ -1,19 +1,15 @@
 # Test cases that are expected to fail, e.g. unimplemented features or bug-fixes.
 # Remove from list when fixed.
-tests = {
-    "import_root_sibling",  # 61
-    "import_child_package_from_package",  # 58
-    "import_root_package_from_child",  # 60
-    "import_parent_package_from_child",  # 59
-    "import_circular_dependency",  # failing because of other bugs now
-    "import_packages_same_name",  # 25
+xfail = {
+    "import_circular_dependency",
     "oneof_enum",  # 63
-    "casing_message_field_uppercase",  # 11
     "namespace_keywords",  # 70
     "namespace_builtin_types",  # 53
     "googletypes_struct",  # 9
     "googletypes_value",  # 9
     "enum_skipped_value",  # 93
+    "import_capitalized_package",
+    "example",  # This is the example in the readme. Not a test.
 }
 
 services = {

betterproto/tests/inputs/example/example.proto

@@ -0,0 +1,8 @@
+syntax = "proto3";
+
+package hello;
+
+// Greeting represents a message you can tell a user.
+message Greeting {
+  string message = 1;
+}

betterproto/tests/inputs/googletypes_response/test_googletypes_response.py

@@ -4,9 +4,7 @@ import betterproto.lib.google.protobuf as protobuf
 import pytest
 
 from betterproto.tests.mocks import MockChannel
-from betterproto.tests.output_betterproto.googletypes_response.googletypes_response import (
-    TestStub,
-)
+from betterproto.tests.output_betterproto.googletypes_response import TestStub
 
 test_cases = [
     (TestStub.get_double, protobuf.DoubleValue, 2.5),

betterproto/tests/inputs/googletypes_response_embedded/test_googletypes_response_embedded.py

@@ -1,7 +1,7 @@
 import pytest
 
 from betterproto.tests.mocks import MockChannel
-from betterproto.tests.output_betterproto.googletypes_response_embedded.googletypes_response_embedded import (
+from betterproto.tests.output_betterproto.googletypes_response_embedded import (
     Output,
     TestStub,
 )

betterproto/tests/inputs/import_capitalized_package/capitalized.proto

@@ -0,0 +1,8 @@
+syntax = "proto3";
+
+
+package Capitalized;
+
+message Message {
+
+}

betterproto/tests/inputs/import_capitalized_package/test.proto

@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+import "capitalized.proto";
+
+// Tests that we can import from a package with a capital name, that looks like a nested type, but isn't.
+
+message Test {
+  Capitalized.Message message = 1;
+}

betterproto/tests/inputs/import_circular_dependency/import_circular_dependency.proto

@@ -3,9 +3,9 @@ syntax = "proto3";
 import "root.proto";
 import "other.proto";
 
-// This test-case verifies that future implementations will support circular dependencies in the generated python files.
+// This test-case verifies support for circular dependencies in the generated python files.
 //
-// This becomes important when generating 1 python file/module per package, rather than 1 file per proto file.
+// This is important because we generate 1 python file/module per package, rather than 1 file per proto file.
 //
 // Scenario:
 //
@@ -24,5 +24,5 @@ import "other.proto";
 //           (root: Test & RootPackageMessage) <-------> (other: OtherPackageMessage)
 message Test {
   RootPackageMessage message = 1;
-  other.OtherPackageMessage other =2;
+  other.OtherPackageMessage other = 2;
 }

betterproto/tests/inputs/import_cousin_package/cousin.proto

@@ -0,0 +1,6 @@
+syntax = "proto3";
+
+package cousin.cousin_subpackage;
+
+message CousinMessage {
+}

betterproto/tests/inputs/import_cousin_package/test.proto

@@ -0,0 +1,11 @@
+syntax = "proto3";
+
+package test.subpackage;
+
+import "cousin.proto";
+
+// Verify that we can import message unrelated to us
+
+message Test {
+    cousin.cousin_subpackage.CousinMessage message = 1;
+}

betterproto/tests/inputs/import_cousin_package_same_name/cousin.proto

@@ -0,0 +1,6 @@
+syntax = "proto3";
+
+package cousin.subpackage;
+
+message CousinMessage {
+}

betterproto/tests/inputs/import_cousin_package_same_name/test.proto

@@ -0,0 +1,11 @@
+syntax = "proto3";
+
+package test.subpackage;
+
+import "cousin.proto";
+
+// Verify that we can import a message unrelated to us, in a subpackage with the same name as us.
+
+message Test {
+    cousin.subpackage.CousinMessage message = 1;
+}

betterproto/tests/inputs/import_root_package_from_child/child.proto

@@ -0,0 +1,11 @@
+syntax = "proto3";
+
+package child;
+
+import "root.proto";
+
+// Verify that we can import root message from child package
+
+message Test {
+    RootMessage message = 1;
+}

betterproto/tests/inputs/import_root_package_from_child/import_root_package_from_child.proto

@@ -1,11 +0,0 @@
-syntax = "proto3";
-
-import "root.proto";
-
-package child;
-
-// Tests generated imports when a message inside a child-package refers to a message defined in the root.
-
-message Test {
-  RootMessage message = 1;
-}

betterproto/tests/inputs/import_service_input_message/test_import_service.py

@@ -1,7 +1,7 @@
 import pytest
 
 from betterproto.tests.mocks import MockChannel
-from betterproto.tests.output_betterproto.import_service_input_message.import_service_input_message import (
+from betterproto.tests.output_betterproto.import_service_input_message import (
     RequestResponse,
     TestStub,
 )

betterproto/tests/inputs/nested/nested.proto

@@ -15,4 +15,4 @@ message Test {
 
 message Sibling {
   int32 foo = 1;
-}
+}

betterproto/tests/inputs/nested2/nested2.proto

@@ -0,0 +1,19 @@
+syntax = "proto3";
+
+import "package.proto";
+
+message Game {
+    message Player {
+        enum Race {
+            human = 0;
+            orc = 1;
+        }
+    }
+}
+
+message Test {
+    Game game = 1;
+    Game.Player GamePlayer = 2;
+    Game.Player.Race GamePlayerRace = 3;
+    equipment.Weapon Weapon = 4;
+}

betterproto/tests/inputs/nested2/package.proto

@@ -0,0 +1,7 @@
+syntax = "proto3";
+
+package equipment;
+
+message Weapon {
+
+}

betterproto/tests/inputs/nestedtwice/nestedtwice.json

@@ -1,10 +1,10 @@
 {
-  "root": {
+  "top": {
     "name": "double-nested",
-    "parent": {
-      "child": [{"foo": "hello"}],
-      "enumChild": ["A"],
-      "rootParentChild": [{"a": "hello"}],
+    "middle": {
+      "bottom": [{"foo": "hello"}],
+      "enumBottom": ["A"],
+      "topMiddleBottom": [{"a": "hello"}],
       "bar": true
     }
   }

betterproto/tests/inputs/nestedtwice/nestedtwice.proto

@@ -1,26 +1,26 @@
 syntax = "proto3";
 
 message Test {
-  message Root {
-    message Parent {
-      message RootParentChild {
+  message Top {
+    message Middle {
+      message TopMiddleBottom {
         string a = 1;
       }
-      enum EnumChild{
+      enum EnumBottom{
         A = 0;
         B = 1;
       }
-      message Child {
+      message Bottom {
         string foo = 1;
       }
       reserved 1;
-      repeated Child child = 2;
-      repeated EnumChild enumChild=3;
-      repeated RootParentChild rootParentChild=4;
+      repeated Bottom bottom = 2;
+      repeated EnumBottom enumBottom=3;
+      repeated TopMiddleBottom topMiddleBottom=4;
       bool bar = 5;
     }
     string name = 1;
-    Parent parent = 2;
+    Middle middle = 2;
   }
-  Root root = 1;
+  Top top = 1;
 }

betterproto/tests/inputs/oneof/test_oneof.py

@@ -1,5 +1,5 @@
 import betterproto
-from betterproto.tests.output_betterproto.oneof.oneof import Test
+from betterproto.tests.output_betterproto.oneof import Test
 from betterproto.tests.util import get_test_case_json_data
 
 

betterproto/tests/inputs/oneof_enum/test_oneof_enum.py

@@ -1,7 +1,7 @@
 import pytest
 
 import betterproto
-from betterproto.tests.output_betterproto.oneof_enum.oneof_enum import (
+from betterproto.tests.output_betterproto.oneof_enum import (
     Move,
     Signal,
     Test,

betterproto/tests/inputs/ref/ref.proto

@@ -1,7 +1,5 @@
 syntax = "proto3";
 
-package ref;
-
 import "repeatedmessage.proto";
 
 message Test {

betterproto/tests/test_casing.py

@@ -0,0 +1,125 @@
+import pytest
+
+from betterproto.casing import camel_case, pascal_case, snake_case
+
+
+@pytest.mark.parametrize(
+    ["value", "expected"],
+    [
+        ("", ""),
+        ("a", "A"),
+        ("foobar", "Foobar"),
+        ("fooBar", "FooBar"),
+        ("FooBar", "FooBar"),
+        ("foo.bar", "FooBar"),
+        ("foo_bar", "FooBar"),
+        ("FOOBAR", "Foobar"),
+        ("FOOBar", "FooBar"),
+        ("UInt32", "UInt32"),
+        ("FOO_BAR", "FooBar"),
+        ("FOOBAR1", "Foobar1"),
+        ("FOOBAR_1", "Foobar1"),
+        ("FOO1BAR2", "Foo1Bar2"),
+        ("foo__bar", "FooBar"),
+        ("_foobar", "Foobar"),
+        ("foobaR", "FoobaR"),
+        ("foo~bar", "FooBar"),
+        ("foo:bar", "FooBar"),
+        ("1foobar", "1Foobar"),
+    ],
+)
+def test_pascal_case(value, expected):
+    actual = pascal_case(value, strict=True)
+    assert actual == expected, f"{value} => {expected} (actual: {actual})"
+
+
+@pytest.mark.parametrize(
+    ["value", "expected"],
+    [
+        ("", ""),
+        ("a", "a"),
+        ("foobar", "foobar"),
+        ("fooBar", "fooBar"),
+        ("FooBar", "fooBar"),
+        ("foo.bar", "fooBar"),
+        ("foo_bar", "fooBar"),
+        ("FOOBAR", "foobar"),
+        ("FOO_BAR", "fooBar"),
+        ("FOOBAR1", "foobar1"),
+        ("FOOBAR_1", "foobar1"),
+        ("FOO1BAR2", "foo1Bar2"),
+        ("foo__bar", "fooBar"),
+        ("_foobar", "foobar"),
+        ("foobaR", "foobaR"),
+        ("foo~bar", "fooBar"),
+        ("foo:bar", "fooBar"),
+        ("1foobar", "1Foobar"),
+    ],
+)
+def test_camel_case_strict(value, expected):
+    actual = camel_case(value, strict=True)
+    assert actual == expected, f"{value} => {expected} (actual: {actual})"
+
+
+@pytest.mark.parametrize(
+    ["value", "expected"],
+    [
+        ("foo_bar", "fooBar"),
+        ("FooBar", "fooBar"),
+        ("foo__bar", "foo_Bar"),
+        ("foo__Bar", "foo__Bar"),
+    ],
+)
+def test_camel_case_not_strict(value, expected):
+    actual = camel_case(value, strict=False)
+    assert actual == expected, f"{value} => {expected} (actual: {actual})"
+
+
+@pytest.mark.parametrize(
+    ["value", "expected"],
+    [
+        ("", ""),
+        ("a", "a"),
+        ("foobar", "foobar"),
+        ("fooBar", "foo_bar"),
+        ("FooBar", "foo_bar"),
+        ("foo.bar", "foo_bar"),
+        ("foo_bar", "foo_bar"),
+        ("foo_Bar", "foo_bar"),
+        ("FOOBAR", "foobar"),
+        ("FOOBar", "foo_bar"),
+        ("UInt32", "u_int32"),
+        ("FOO_BAR", "foo_bar"),
+        ("FOOBAR1", "foobar1"),
+        ("FOOBAR_1", "foobar_1"),
+        ("FOOBAR_123", "foobar_123"),
+        ("FOO1BAR2", "foo1_bar2"),
+        ("foo__bar", "foo_bar"),
+        ("_foobar", "foobar"),
+        ("foobaR", "fooba_r"),
+        ("foo~bar", "foo_bar"),
+        ("foo:bar", "foo_bar"),
+        ("1foobar", "1_foobar"),
+        ("GetUInt64", "get_u_int64"),
+    ],
+)
+def test_snake_case_strict(value, expected):
+    actual = snake_case(value)
+    assert actual == expected, f"{value} => {expected} (actual: {actual})"
+
+
+@pytest.mark.parametrize(
+    ["value", "expected"],
+    [
+        ("fooBar", "foo_bar"),
+        ("FooBar", "foo_bar"),
+        ("foo_Bar", "foo__bar"),
+        ("foo__bar", "foo__bar"),
+        ("FOOBar", "foo_bar"),
+        ("__foo", "__foo"),
+        ("GetUInt64", "get_u_int64"),
+    ],
+)
+def test_snake_case_not_strict(value, expected):
+    actual = snake_case(value, strict=False)
+    assert actual == expected, f"{value} => {expected} (actual: {actual})"

betterproto/tests/test_get_ref_type.py

@@ -1,6 +1,6 @@
 import pytest
 
-from ..compile.importing import get_ref_type
+from ..compile.importing import get_type_reference, parse_source_type_name
 
 
 @pytest.mark.parametrize(
@@ -28,14 +28,16 @@ from ..compile.importing import get_ref_type
         ),
     ],
 )
-def test_import_google_wellknown_types_non_wrappers(
+def test_reference_google_wellknown_types_non_wrappers(
     google_type: str, expected_name: str, expected_import: str
 ):
     imports = set()
-    name = get_ref_type(package="", imports=imports, type_name=google_type)
+    name = get_type_reference(package="", imports=imports, source_type=google_type)
 
     assert name == expected_name
-    assert imports.__contains__(expected_import)
+    assert imports.__contains__(
+        expected_import
+    ), f"{expected_import} not found in {imports}"
 
 
 @pytest.mark.parametrize(
@@ -52,9 +54,11 @@ def test_import_google_wellknown_types_non_wrappers(
         (".google.protobuf.BytesValue", "Optional[bytes]"),
     ],
 )
-def test_importing_google_wrappers_unwraps_them(google_type: str, expected_name: str):
+def test_referenceing_google_wrappers_unwraps_them(
+    google_type: str, expected_name: str
+):
     imports = set()
-    name = get_ref_type(package="", imports=imports, type_name=google_type)
+    name = get_type_reference(package="", imports=imports, source_type=google_type)
 
     assert name == expected_name
     assert imports == set()
@@ -74,9 +78,238 @@ def test_importing_google_wrappers_unwraps_them(google_type: str, expected_name:
         (".google.protobuf.BytesValue", "betterproto_lib_google_protobuf.BytesValue"),
     ],
 )
-def test_importing_google_wrappers_without_unwrapping(
+def test_referenceing_google_wrappers_without_unwrapping(
     google_type: str, expected_name: str
 ):
-    name = get_ref_type(package="", imports=set(), type_name=google_type, unwrap=False)
+    name = get_type_reference(
+        package="", imports=set(), source_type=google_type, unwrap=False
+    )
 
     assert name == expected_name
+
+
+def test_reference_child_package_from_package():
+    imports = set()
+    name = get_type_reference(
+        package="package", imports=imports, source_type="package.child.Message"
+    )
+
+    assert imports == {"from . import child"}
+    assert name == "child.Message"
+
+
+def test_reference_child_package_from_root():
+    imports = set()
+    name = get_type_reference(package="", imports=imports, source_type="child.Message")
+
+    assert imports == {"from . import child"}
+    assert name == "child.Message"
+
+
+def test_reference_camel_cased():
+    imports = set()
+    name = get_type_reference(
+        package="", imports=imports, source_type="child_package.example_message"
+    )
+
+    assert imports == {"from . import child_package"}
+    assert name == "child_package.ExampleMessage"
+
+
+def test_reference_nested_child_from_root():
+    imports = set()
+    name = get_type_reference(
+        package="", imports=imports, source_type="nested.child.Message"
+    )
+
+    assert imports == {"from .nested import child as nested_child"}
+    assert name == "nested_child.Message"
+
+
+def test_reference_deeply_nested_child_from_root():
+    imports = set()
+    name = get_type_reference(
+        package="", imports=imports, source_type="deeply.nested.child.Message"
+    )
+
+    assert imports == {"from .deeply.nested import child as deeply_nested_child"}
+    assert name == "deeply_nested_child.Message"
+
+
+def test_reference_deeply_nested_child_from_package():
+    imports = set()
+    name = get_type_reference(
+        package="package",
+        imports=imports,
+        source_type="package.deeply.nested.child.Message",
+    )
+
+    assert imports == {"from .deeply.nested import child as deeply_nested_child"}
+    assert name == "deeply_nested_child.Message"
+
+
+def test_reference_root_sibling():
+    imports = set()
+    name = get_type_reference(package="", imports=imports, source_type="Message")
+
+    assert imports == set()
+    assert name == '"Message"'
+
+
+def test_reference_nested_siblings():
+    imports = set()
+    name = get_type_reference(package="foo", imports=imports, source_type="foo.Message")
+
+    assert imports == set()
+    assert name == '"Message"'
+
+
+def test_reference_deeply_nested_siblings():
+    imports = set()
+    name = get_type_reference(
+        package="foo.bar", imports=imports, source_type="foo.bar.Message"
+    )
+
+    assert imports == set()
+    assert name == '"Message"'
+
+
+def test_reference_parent_package_from_child():
+    imports = set()
+    name = get_type_reference(
+        package="package.child", imports=imports, source_type="package.Message"
+    )
+
+    assert imports == {"from ... import package as __package__"}
+    assert name == "__package__.Message"
+
+
+def test_reference_parent_package_from_deeply_nested_child():
+    imports = set()
+    name = get_type_reference(
+        package="package.deeply.nested.child",
+        imports=imports,
+        source_type="package.deeply.nested.Message",
+    )
+
+    assert imports == {"from ... import nested as __nested__"}
+    assert name == "__nested__.Message"
+
+
+def test_reference_ancestor_package_from_nested_child():
+    imports = set()
+    name = get_type_reference(
+        package="package.ancestor.nested.child",
+        imports=imports,
+        source_type="package.ancestor.Message",
+    )
+
+    assert imports == {"from .... import ancestor as ___ancestor__"}
+    assert name == "___ancestor__.Message"
+
+
+def test_reference_root_package_from_child():
+    imports = set()
+    name = get_type_reference(
+        package="package.child", imports=imports, source_type="Message"
+    )
+
+    assert imports == {"from ... import Message as __Message__"}
+    assert name == "__Message__"
+
+
+def test_reference_root_package_from_deeply_nested_child():
+    imports = set()
+    name = get_type_reference(
+        package="package.deeply.nested.child", imports=imports, source_type="Message"
+    )
+
+    assert imports == {"from ..... import Message as ____Message__"}
+    assert name == "____Message__"
+
+
+def test_reference_unrelated_package():
+    imports = set()
+    name = get_type_reference(package="a", imports=imports, source_type="p.Message")
+
+    assert imports == {"from .. import p as _p__"}
+    assert name == "_p__.Message"
+
+
+def test_reference_unrelated_nested_package():
+    imports = set()
+    name = get_type_reference(package="a.b", imports=imports, source_type="p.q.Message")
+
+    assert imports == {"from ...p import q as __p_q__"}
+    assert name == "__p_q__.Message"
+
+
+def test_reference_unrelated_deeply_nested_package():
+    imports = set()
+    name = get_type_reference(
+        package="a.b.c.d", imports=imports, source_type="p.q.r.s.Message"
+    )
+
+    assert imports == {"from .....p.q.r import s as ____p_q_r_s__"}
+    assert name == "____p_q_r_s__.Message"
+
+
+def test_reference_cousin_package():
+    imports = set()
+    name = get_type_reference(package="a.x", imports=imports, source_type="a.y.Message")
+
+    assert imports == {"from .. import y as _y__"}
+    assert name == "_y__.Message"
+
+
+def test_reference_cousin_package_different_name():
+    imports = set()
+    name = get_type_reference(
+        package="test.package1", imports=imports, source_type="cousin.package2.Message"
+    )
+
+    assert imports == {"from ...cousin import package2 as __cousin_package2__"}
+    assert name == "__cousin_package2__.Message"
+
+
+def test_reference_cousin_package_same_name():
+    imports = set()
+    name = get_type_reference(
+        package="test.package", imports=imports, source_type="cousin.package.Message"
+    )
+
+    assert imports == {"from ...cousin import package as __cousin_package__"}
+    assert name == "__cousin_package__.Message"
+
+
+def test_reference_far_cousin_package():
+    imports = set()
+    name = get_type_reference(
+        package="a.x.y", imports=imports, source_type="a.b.c.Message"
+    )
+
+    assert imports == {"from ...b import c as __b_c__"}
+    assert name == "__b_c__.Message"
+
+
+def test_reference_far_far_cousin_package():
+    imports = set()
+    name = get_type_reference(
+        package="a.x.y.z", imports=imports, source_type="a.b.c.d.Message"
+    )
+
+    assert imports == {"from ....b.c import d as ___b_c_d__"}
+    assert name == "___b_c_d__.Message"
+
+
+@pytest.mark.parametrize(
+    ["full_name", "expected_output"],
+    [
+        ("package.SomeMessage.NestedType", ("package", "SomeMessage.NestedType")),
+        (".package.SomeMessage.NestedType", ("package", "SomeMessage.NestedType")),
+        (".service.ExampleRequest", ("service", "ExampleRequest")),
+        (".package.lower_case_message", ("package", "lower_case_message")),
+    ],
+)
+def test_parse_field_type_name(full_name, expected_output):
+    assert parse_source_type_name(full_name) == expected_output

betterproto/tests/test_inputs.py

@@ -3,6 +3,7 @@ import json
 import os
 import sys
 from collections import namedtuple
+from types import ModuleType
 from typing import Set
 
 import pytest
@@ -10,7 +11,12 @@ import pytest
 import betterproto
 from betterproto.tests.inputs import config as test_input_config
 from betterproto.tests.mocks import MockChannel
-from betterproto.tests.util import get_directories, get_test_case_json_data, inputs_path
+from betterproto.tests.util import (
+    find_module,
+    get_directories,
+    get_test_case_json_data,
+    inputs_path,
+)
 
 # Force pure-python implementation instead of C++, otherwise imports
 # break things because we can't properly reset the symbol database.
@@ -50,14 +56,17 @@ class TestCases:
 test_cases = TestCases(
     path=inputs_path,
     services=test_input_config.services,
-    xfail=test_input_config.tests,
+    xfail=test_input_config.xfail,
 )
 
 plugin_output_package = "betterproto.tests.output_betterproto"
 reference_output_package = "betterproto.tests.output_reference"
 
+TestData = namedtuple("TestData", ["plugin_module", "reference_module", "json_data"])
 
-TestData = namedtuple("TestData", "plugin_module, reference_module, json_data")
+
+def module_has_entry_point(module: ModuleType):
+    return any(hasattr(module, attr) for attr in ["Test", "TestStub"])
 
 
 @pytest.fixture
@@ -75,11 +84,19 @@ def test_data(request):
 
     sys.path.append(reference_module_root)
 
+    plugin_module = importlib.import_module(f"{plugin_output_package}.{test_case_name}")
+
+    plugin_module_entry_point = find_module(plugin_module, module_has_entry_point)
+
+    if not plugin_module_entry_point:
+        raise Exception(
+            f"Test case {repr(test_case_name)} has no entry point. "
+            "Please add a proto message or service called Test and recompile."
+        )
+
     yield (
         TestData(
-            plugin_module=importlib.import_module(
-                f"{plugin_output_package}.{test_case_name}.{test_case_name}"
-            ),
+            plugin_module=plugin_module_entry_point,
             reference_module=lambda: importlib.import_module(
                 f"{reference_output_package}.{test_case_name}.{test_case_name}_pb2"
             ),

betterproto/tests/util.py

@@ -1,7 +1,10 @@
 import asyncio
+import importlib
 import os
+import pathlib
 from pathlib import Path
-from typing import Generator, IO, Optional
+from types import ModuleType
+from typing import Callable, Generator, Optional
 
 os.environ["PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION"] = "python"
 
@@ -55,3 +58,35 @@ def get_test_case_json_data(test_case_name: str, json_file_name: Optional[str] =
 
     with test_data_file_path.open("r") as fh:
         return fh.read()
+
+
+def find_module(
+    module: ModuleType, predicate: Callable[[ModuleType], bool]
+) -> Optional[ModuleType]:
+    """
+    Recursively search module tree for a module that matches the search predicate.
+    Assumes that the submodules are directories containing __init__.py.
+
+    Example:
+
+        # find module inside foo that contains Test
+        import foo
+        test_module = find_module(foo, lambda m: hasattr(m, 'Test'))
+    """
+    if predicate(module):
+        return module
+
+    module_path = pathlib.Path(*module.__path__)
+
+    for sub in list(sub.parent for sub in module_path.glob("**/__init__.py")):
+        if sub == module_path:
+            continue
+        sub_module_path = sub.relative_to(module_path)
+        sub_module_name = ".".join(sub_module_path.parts)
+
+        sub_module = importlib.import_module(f".{sub_module_name}", module.__name__)
+
+        if predicate(sub_module):
+            return sub_module
+
+    return None

poetry.lock

@@ -271,7 +271,7 @@ docs = ["sphinx", "rst.linker", "jaraco.packaging"]
 category = "main"
 description = "A very fast and expressive template engine."
 name = "jinja2"
-optional = true
+optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 version = "2.11.2"
 
@@ -285,7 +285,7 @@ i18n = ["Babel (>=0.8)"]
 category = "main"
 description = "Safely add untrusted strings to HTML/XML markup."
 name = "markupsafe"
-optional = true
+optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 version = "1.1.1"
 
@@ -369,7 +369,7 @@ dev = ["pre-commit", "tox"]
 category = "main"
 description = "Protocol Buffers"
 name = "protobuf"
-optional = true
+optional = false
 python-versions = "*"
 version = "3.12.2"
 
@@ -490,14 +490,6 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 version = "1.15.0"
 
-[[package]]
-category = "main"
-description = "String case converter."
-name = "stringcase"
-optional = false
-python-versions = "*"
-version = "1.2.0"
-
 [[package]]
 category = "main"
 description = "Python Library for Tom's Obvious, Minimal Language"
@@ -612,7 +604,7 @@ testing = ["jaraco.itertools", "func-timeout"]
 compiler = ["black", "jinja2", "protobuf"]
 
 [metadata]
-content-hash = "ecafcaed2d4a25c2829e6dc3ef3c56cd72a8bc28c25c7aeae3484c978c816722"
+content-hash = "8a4fa01ede86e1b5ba35b9dab8b6eacee766a9b5666f48ab41445c01882ab003"
 python-versions = "^3.6"
 
 [metadata.files]
@@ -865,6 +857,8 @@ protobuf = [
     {file = "protobuf-3.12.2-cp37-cp37m-win_amd64.whl", hash = "sha256:e72736dd822748b0721f41f9aaaf6a5b6d5cfc78f6c8690263aef8bba4457f0e"},
     {file = "protobuf-3.12.2-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:87535dc2d2ef007b9d44e309d2b8ea27a03d2fa09556a72364d706fcb7090828"},
     {file = "protobuf-3.12.2-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:50b5fee674878b14baea73b4568dc478c46a31dd50157a5b5d2f71138243b1a9"},
+    {file = "protobuf-3.12.2-py2.py3-none-any.whl", hash = "sha256:a96f8fc625e9ff568838e556f6f6ae8eca8b4837cdfb3f90efcb7c00e342a2eb"},
+    {file = "protobuf-3.12.2.tar.gz", hash = "sha256:49ef8ab4c27812a89a76fa894fe7a08f42f2147078392c0dee51d4a444ef6df5"},
 ]
 py = [
     {file = "py-1.8.2-py2.py3-none-any.whl", hash = "sha256:a673fa23d7000440cc885c17dbd34fafcb7d7a6e230b29f6766400de36a33c44"},
@@ -920,9 +914,6 @@ six = [
     {file = "six-1.15.0-py2.py3-none-any.whl", hash = "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"},
     {file = "six-1.15.0.tar.gz", hash = "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259"},
 ]
-stringcase = [
-    {file = "stringcase-1.2.0.tar.gz", hash = "sha256:48a06980661908efe8d9d34eab2b6c13aefa2163b3ced26972902e3bdfd87008"},
-]
 toml = [
     {file = "toml-0.10.1-py2.py3-none-any.whl", hash = "sha256:bda89d5935c2eac546d648028b9901107a595863cb36bae0c73ac804a9b4ce88"},
     {file = "toml-0.10.1.tar.gz", hash = "sha256:926b612be1e5ce0634a2ca03470f95169cf16f939018233a670519cb4ac58b0f"},

pyproject.toml

@@ -18,7 +18,6 @@ dataclasses = { version = "^0.7", python = ">=3.6, <3.7" }
 grpclib = "^0.3.1"
 jinja2 = { version = "^2.11.2", optional = true }
 protobuf = { version = "^3.12.2", optional = true }
-stringcase = "^1.2.0"
 
 [tool.poetry.dev-dependencies]
 black = "^19.10b0"