Add test database configuration and schema creation for testing

app/config.py

@@ -33,6 +33,8 @@ class Settings(BaseSettings):
     POSTGRES_PASSWORD: str
     POSTGRES_HOST: str
     POSTGRES_DB: str
+    POSTGRES_TEST_USER: str
+    POSTGRES_TEST_DB: str
 
     @computed_field
     @property
@@ -80,6 +82,17 @@ class Settings(BaseSettings):
             path=self.POSTGRES_DB,
         )
 
+    @computed_field
+    @property
+    def test_asyncpg_url(self) -> PostgresDsn:
+        return MultiHostUrl.build(
+            scheme="postgresql+asyncpg",
+            username=self.POSTGRES_USER,
+            password=self.POSTGRES_PASSWORD,
+            host=self.POSTGRES_HOST,
+            path=self.POSTGRES_TEST_DB,
+        )
+
     @computed_field
     @property
     def postgres_url(self) -> PostgresDsn: