Add another missing gitignored file, and remove gitignore filter for tests/

.gitignore

@@ -4,14 +4,9 @@
 .pytest_cache
 .python-version
 build/
-betterproto/tests/*.bin
+betterproto/tests/output_*
-betterproto/tests/*_pb2.py
-betterproto/tests/*.py
-!betterproto/tests/generate.py
-!betterproto/tests/test_*.py
 **/__pycache__
 dist
 **/*.egg-info
 output
-betterproto/tests/output_*
 .idea

betterproto/tests/util.py

@@ -0,0 +1,46 @@
+import os
+import subprocess
+from typing import Generator
+
+os.environ["PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION"] = "python"
+
+root_path = os.path.dirname(os.path.realpath(__file__))
+inputs_path = os.path.join(root_path, 'inputs')
+
+if os.name == 'nt':
+    plugin_path = os.path.join(root_path, '..', 'plugin.bat')
+else:
+    plugin_path = os.path.join(root_path, '..', 'plugin.py')
+
+
+def get_files(path, end: str) -> Generator[str, None, None]:
+    for r, dirs, files in os.walk(path):
+        for filename in [f for f in files if f.endswith(end)]:
+            yield os.path.join(r, filename)
+
+
+def get_directories(path):
+    for root, directories, files in os.walk(path):
+        for directory in directories:
+            yield directory
+
+
+def relative(file: str, path: str):
+    return os.path.join(os.path.dirname(file), path)
+
+
+def read_relative(file: str, path: str):
+    with open(relative(file, path)) as fh:
+        return fh.read()
+
+
+def protoc_plugin(path: str, output_dir: str):
+    subprocess.run(
+        f"protoc --plugin=protoc-gen-custom={plugin_path} --custom_out={output_dir} --proto_path={path} {path}/*.proto",
+        shell=True,
+    )
+
+
+def protoc_reference(path: str, output_dir: str):
+    subprocess.run(f"protoc --python_out={output_dir} --proto_path={path} {path}/*.proto", shell=True)
+