Add test cases for each security engine

Author: ArtyomVancyan

tests/test_routes.py renamed to tests/test_router.py

@@ -0,0 +1,29 @@
+import pytest
+
+from fastapi_oauth2.security import OAuth2
+from fastapi_oauth2.security import OAuth2AuthorizationCodeBearer
+from fastapi_oauth2.security import OAuth2PasswordBearer
+
+
+@pytest.mark.anyio
+async def test_security_oauth2(get_app):
+    try:
+        get_app(OAuth2())
+    except (TypeError, Exception):
+        assert False
+
+
+@pytest.mark.anyio
+async def test_security_oauth2_password_bearer(get_app):
+    try:
+        get_app(OAuth2PasswordBearer(tokenUrl="/test"))
+    except (TypeError, Exception):
+        assert False
+
+
+@pytest.mark.anyio
+async def test_security_oauth2_authentication_code_bearer(get_app):
+    try:
+        get_app(OAuth2AuthorizationCodeBearer(authorizationUrl="/test", tokenUrl="/test"))
+    except (TypeError, Exception):
+        assert False