diff --git a/aiohttp_pydantic/oas/struct.py b/aiohttp_pydantic/oas/struct.py
index 6751c3f..74ad9cc 100644
--- a/aiohttp_pydantic/oas/struct.py
+++ b/aiohttp_pydantic/oas/struct.py
@@ -1,3 +1,7 @@
+"""
+Utility to write Open Api Specifications using the Python language.
+"""
+
 from typing import Union
 
 
@@ -7,7 +11,7 @@ class Info:
 
     @property
     def title(self):
-        return self._spec["title"]
+        return self._spec.get("title")
 
     @title.setter
     def title(self, title):
@@ -15,7 +19,7 @@ class Info:
 
     @property
     def description(self):
-        return self._spec["description"]
+        return self._spec.get("description")
 
     @description.setter
     def description(self, description):
@@ -23,12 +27,20 @@ class Info:
 
     @property
     def version(self):
-        return self._spec["version"]
+        return self._spec.get("version")
 
     @version.setter
     def version(self, version):
         self._spec["version"] = version
 
+    @property
+    def terms_of_service(self):
+        return self._spec.get("termsOfService")
+
+    @terms_of_service.setter
+    def terms_of_service(self, terms_of_service):
+        self._spec["termsOfService"] = terms_of_service
+
 
 class RequestBody:
     def __init__(self, spec: dict):
@@ -43,8 +55,8 @@ class RequestBody:
         self._spec["description"] = description
 
     @property
-    def required(self):
-        return self._spec["required"]
+    def required(self) -> bool:
+        return self._spec.get("required", False)
 
     @required.setter
     def required(self, required: bool):
@@ -220,6 +232,22 @@ class PathItem:
     def trace(self) -> OperationObject:
         return OperationObject(self._spec.setdefault("trace", {}))
 
+    @property
+    def description(self) -> str:
+        return self._spec["description"]
+
+    @description.setter
+    def description(self, description: str):
+        self._spec["description"] = description
+
+    @property
+    def summary(self) -> str:
+        return self._spec["summary"]
+
+    @summary.setter
+    def summary(self, summary: str):
+        self._spec["summary"] = summary
+
 
 class Paths:
     def __init__(self, spec: dict):
@@ -244,7 +272,7 @@ class Server:
 
     @property
     def description(self) -> str:
-        return self._spec["url"]
+        return self._spec["description"]
 
     @description.setter
     def description(self, description: str):
diff --git a/aiohttp_pydantic/oas/typing.py b/aiohttp_pydantic/oas/typing.py
index 5be1cd7..a5f4708 100644
--- a/aiohttp_pydantic/oas/typing.py
+++ b/aiohttp_pydantic/oas/typing.py
@@ -13,7 +13,7 @@ Example:
 
 from functools import lru_cache
 from types import new_class
-from typing import Protocol, TypeVar
+from typing import Protocol, TypeVar, Optional, Type
 
 RespContents = TypeVar("RespContents", covariant=True)
 
@@ -24,9 +24,10 @@ _status_code = frozenset(f"r{code}" for code in range(100, 600))
 def _make_status_code_type(status_code):
     if status_code in _status_code:
         return new_class(status_code, (Protocol[RespContents],))
+    return None
 
 
-def is_status_code_type(obj):
+def is_status_code_type(obj) -> bool:
     """
     Return True if obj is a status code type such as _200 or _404.
     """
diff --git a/aiohttp_pydantic/oas/view.py b/aiohttp_pydantic/oas/view.py
index 4c03ff0..de1f222 100644
--- a/aiohttp_pydantic/oas/view.py
+++ b/aiohttp_pydantic/oas/view.py
@@ -1,6 +1,9 @@
-from inspect import getdoc
 import typing
+from datetime import date, datetime
+from inspect import getdoc
+from itertools import count
 from typing import List, Type
+from uuid import UUID
 
 from aiohttp.web import Response, json_response
 from aiohttp.web_app import Application
@@ -12,7 +15,30 @@ from ..utils import is_pydantic_base_model
 from ..view import PydanticView, is_pydantic_view
 from .typing import is_status_code_type
 
-JSON_SCHEMA_TYPES = {float: "number", str: "string", int: "integer"}
+JSON_SCHEMA_TYPES = {
+    float: {"type": "number"},
+    str: {"type": "string"},
+    int: {"type": "integer"},
+    UUID: {"type": "string", "format": "uuid"},
+    bool: {"type": "boolean"},
+    datetime: {"type": "string", "format": "date-time"},
+    date: {"type": "string", "format": "date"},
+}
+
+
+def _handle_optional(type_):
+    """
+    Returns the type wrapped in Optional or None.
+
+    >>>  _handle_optional(int)
+    >>>  _handle_optional(Optional[str])
+    <class 'str'>
+    """
+    if typing.get_origin(type_) is typing.Union:
+        args = typing.get_args(type_)
+        if len(args) == 2 and type(None) in args:
+            return next(iter(set(args) - {type(None)}))
+    return None
 
 
 class _OASResponseBuilder:
@@ -77,24 +103,23 @@ def _add_http_method_to_oas(
             "application/json": {"schema": next(iter(body_args.values())).schema()}
         }
 
-    i = 0
-    for i, (name, type_) in enumerate(path_args.items()):
-        oas_operation.parameters[i].required = True
-        oas_operation.parameters[i].in_ = "path"
-        oas_operation.parameters[i].name = name
-        oas_operation.parameters[i].schema = {"type": JSON_SCHEMA_TYPES[type_]}
-
-    for i, (name, type_) in enumerate(qs_args.items(), i + 1):
-        oas_operation.parameters[i].required = False
-        oas_operation.parameters[i].in_ = "query"
-        oas_operation.parameters[i].name = name
-        oas_operation.parameters[i].schema = {"type": JSON_SCHEMA_TYPES[type_]}
-
-    for i, (name, type_) in enumerate(header_args.items(), i + 1):
-        oas_operation.parameters[i].required = False
-        oas_operation.parameters[i].in_ = "header"
-        oas_operation.parameters[i].name = name
-        oas_operation.parameters[i].schema = {"type": JSON_SCHEMA_TYPES[type_]}
+    indexes = count()
+    for args_location, args in (
+        ("path", path_args.items()),
+        ("query", qs_args.items()),
+        ("header", header_args.items()),
+    ):
+        for name, type_ in args:
+            i = next(indexes)
+            oas_operation.parameters[i].in_ = args_location
+            oas_operation.parameters[i].name = name
+            optional_type = _handle_optional(type_)
+            if optional_type is None:
+                oas_operation.parameters[i].schema = JSON_SCHEMA_TYPES[type_]
+                oas_operation.parameters[i].required = True
+            else:
+                oas_operation.parameters[i].schema = JSON_SCHEMA_TYPES[optional_type]
+                oas_operation.parameters[i].required = False
 
     return_type = handler.__annotations__.get("return")
     if return_type is not None:
diff --git a/tests/test_oas/test_struct/__init__.py b/tests/test_oas/test_struct/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_oas/test_struct/test_info.py b/tests/test_oas/test_struct/test_info.py
new file mode 100644
index 0000000..bcd1bf6
--- /dev/null
+++ b/tests/test_oas/test_struct/test_info.py
@@ -0,0 +1,54 @@
+import pytest
+
+from aiohttp_pydantic.oas.struct import OpenApiSpec3
+
+
+def test_info_title():
+    oas = OpenApiSpec3()
+    assert oas.info.title is None
+    oas.info.title = "Info Title"
+    assert oas.info.title == "Info Title"
+    assert oas.spec == {"info": {"title": "Info Title"}, "openapi": "3.0.0"}
+
+
+def test_info_description():
+    oas = OpenApiSpec3()
+    assert oas.info.description is None
+    oas.info.description = "info description"
+    assert oas.info.description == "info description"
+    assert oas.spec == {"info": {"description": "info description"}, "openapi": "3.0.0"}
+
+
+def test_info_version():
+    oas = OpenApiSpec3()
+    assert oas.info.version is None
+    oas.info.version = "3.14"
+    assert oas.info.version == "3.14"
+    assert oas.spec == {"info": {"version": "3.14"}, "openapi": "3.0.0"}
+
+
+def test_info_terms_of_service():
+    oas = OpenApiSpec3()
+    assert oas.info.terms_of_service is None
+    oas.info.terms_of_service = "http://example.com/terms/"
+    assert oas.info.terms_of_service == "http://example.com/terms/"
+    assert oas.spec == {
+        "info": {"termsOfService": "http://example.com/terms/"},
+        "openapi": "3.0.0",
+    }
+
+
+@pytest.mark.skip("Not yet implemented")
+def test_info_license():
+    oas = OpenApiSpec3()
+    oas.info.license.name = "Apache 2.0"
+    oas.info.license.url = "https://www.apache.org/licenses/LICENSE-2.0.html"
+    assert oas.spec == {
+        "info": {
+            "license": {
+                "name": "Apache 2.0",
+                "url": "https://www.apache.org/licenses/LICENSE-2.0.html",
+            }
+        },
+        "openapi": "3.0.0",
+    }
diff --git a/tests/test_oas/test_struct/test_paths.py b/tests/test_oas/test_struct/test_paths.py
new file mode 100644
index 0000000..7db09f3
--- /dev/null
+++ b/tests/test_oas/test_struct/test_paths.py
@@ -0,0 +1,124 @@
+from aiohttp_pydantic.oas.struct import OpenApiSpec3
+
+
+def test_paths_description():
+    oas = OpenApiSpec3()
+    oas.paths["/users/{id}"].description = "This route ..."
+    assert oas.spec == {
+        "openapi": "3.0.0",
+        "paths": {"/users/{id}": {"description": "This route ..."}},
+    }
+
+
+def test_paths_get():
+    oas = OpenApiSpec3()
+    oas.paths["/users/{id}"].get
+    assert oas.spec == {"openapi": "3.0.0", "paths": {"/users/{id}": {"get": {}}}}
+
+
+def test_paths_operation_description():
+    oas = OpenApiSpec3()
+    operation = oas.paths["/users/{id}"].get
+    operation.description = "Long descriptions ..."
+    assert oas.spec == {
+        "openapi": "3.0.0",
+        "paths": {"/users/{id}": {"get": {"description": "Long descriptions ..."}}},
+    }
+
+
+def test_paths_operation_summary():
+    oas = OpenApiSpec3()
+    operation = oas.paths["/users/{id}"].get
+    operation.summary = "Updates a pet in the store with form data"
+    assert oas.spec == {
+        "openapi": "3.0.0",
+        "paths": {
+            "/users/{id}": {
+                "get": {"summary": "Updates a pet in the store with form data"}
+            }
+        },
+    }
+
+
+def test_paths_operation_parameters():
+    oas = OpenApiSpec3()
+    operation = oas.paths["/users/{petId}"].get
+    parameter = operation.parameters[0]
+    parameter.name = "petId"
+    parameter.description = "ID of pet that needs to be updated"
+    parameter.in_ = "path"
+    parameter.required = True
+
+    assert oas.spec == {
+        "openapi": "3.0.0",
+        "paths": {
+            "/users/{petId}": {
+                "get": {
+                    "parameters": [
+                        {
+                            "description": "ID of pet that needs to be updated",
+                            "in": "path",
+                            "name": "petId",
+                            "required": True,
+                        }
+                    ]
+                }
+            }
+        },
+    }
+
+
+def test_paths_operation_requestBody():
+    oas = OpenApiSpec3()
+    request_body = oas.paths["/users/{petId}"].get.request_body
+    request_body.description = "user to add to the system"
+    request_body.content = {
+        "application/json": {
+            "schema": {"$ref": "#/components/schemas/User"},
+            "examples": {
+                "user": {
+                    "summary": "User Example",
+                    "externalValue": "http://foo.bar/examples/user-example.json",
+                }
+            },
+        }
+    }
+    request_body.required = True
+    assert oas.spec == {
+        "openapi": "3.0.0",
+        "paths": {
+            "/users/{petId}": {
+                "get": {
+                    "requestBody": {
+                        "content": {
+                            "application/json": {
+                                "examples": {
+                                    "user": {
+                                        "externalValue": "http://foo.bar/examples/user-example.json",
+                                        "summary": "User Example",
+                                    }
+                                },
+                                "schema": {"$ref": "#/components/schemas/User"},
+                            }
+                        },
+                        "description": "user to add to the system",
+                        "required": True,
+                    }
+                }
+            }
+        },
+    }
+
+
+def test_paths_operation_responses():
+    oas = OpenApiSpec3()
+    response = oas.paths["/users/{petId}"].get.responses[200]
+    response.description = "A complex object array response"
+    response.content = {
+        "application/json": {
+            "schema": {
+                "type": "array",
+                "items": {"$ref": "#/components/schemas/VeryComplexType"},
+            }
+        }
+    }
diff --git a/tests/test_oas/test_struct/test_servers.py b/tests/test_oas/test_struct/test_servers.py
new file mode 100644
index 0000000..b8e0406
--- /dev/null
+++ b/tests/test_oas/test_struct/test_servers.py
@@ -0,0 +1,36 @@
+import pytest
+
+from aiohttp_pydantic.oas.struct import OpenApiSpec3
+
+
+def test_sever_url():
+    oas = OpenApiSpec3()
+    oas.servers[0].url = "https://development.gigantic-server.com/v1"
+    oas.servers[1].url = "https://development.gigantic-server.com/v2"
+    assert oas.spec == {
+        "openapi": "3.0.0",
+        "servers": [
+            {"url": "https://development.gigantic-server.com/v1"},
+            {"url": "https://development.gigantic-server.com/v2"},
+        ],
+    }
+
+
+def test_sever_description():
+    oas = OpenApiSpec3()
+    oas.servers[0].url = "https://development.gigantic-server.com/v1"
+    oas.servers[0].description = "Development server"
+    assert oas.spec == {
+        "openapi": "3.0.0",
+        "servers": [
+            {
+                "url": "https://development.gigantic-server.com/v1",
+                "description": "Development server",
+            }
+        ],
+    }
+
+
+@pytest.mark.skip("Not yet implemented")
+def test_sever_variables():
+    oas = OpenApiSpec3()
diff --git a/tests/test_oas/test_view.py b/tests/test_oas/test_view.py
index f3017a8..a789435 100644
--- a/tests/test_oas/test_view.py
+++ b/tests/test_oas/test_view.py
@@ -1,4 +1,5 @@
-from typing import List, Union
+from typing import List, Optional, Union
+from uuid import UUID
 
 import pytest
 from aiohttp import web
@@ -14,7 +15,9 @@ class Pet(BaseModel):
 
 
 class PetCollectionView(PydanticView):
-    async def get(self) -> r200[List[Pet]]:
+    async def get(
+        self, format: str, name: Optional[str] = None, *, promo: Optional[UUID] = None
+    ) -> r200[List[Pet]]:
         """
         Get a list of pets
         """
@@ -57,21 +60,41 @@ async def test_generated_oas_should_have_pets_paths(generated_oas):
 async def test_pets_route_should_have_get_method(generated_oas):
     assert generated_oas["paths"]["/pets"]["get"] == {
         "description": "Get a list of pets",
+        "parameters": [
+            {
+                "in": "query",
+                "name": "format",
+                "required": True,
+                "schema": {"type": "string"},
+            },
+            {
+                "in": "query",
+                "name": "name",
+                "required": False,
+                "schema": {"type": "string"},
+            },
+            {
+                "in": "header",
+                "name": "promo",
+                "required": False,
+                "schema": {"format": "uuid", "type": "string"},
+            },
+        ],
         "responses": {
             "200": {
                 "content": {
                     "application/json": {
                         "schema": {
-                            "type": "array",
                             "items": {
-                                "title": "Pet",
-                                "type": "object",
                                 "properties": {
                                     "id": {"title": "Id", "type": "integer"},
                                     "name": {"title": "Name", "type": "string"},
                                 },
                                 "required": ["id", "name"],
+                                "title": "Pet",
+                                "type": "object",
                             },
+                            "type": "array",
                         }
                     }
                 }