ci: add support for to run tests with postgresql

.github/workflows/tests.yml

@@ -25,11 +25,24 @@ jobs:
           - { python: "3.12", os: "ubuntu-latest", session: "typeguard" }
           - { python: "3.12", os: "ubuntu-latest", session: "xdoctest" }
           - { python: "3.12", os: "ubuntu-latest", session: "docs-build" }
-
+    services:
+      postgres:
+        image: postgres:15
+        env:
+          POSTGRES_PASSWORD: postgres
+        ports:
+          - 5432:5432
+        # Set health checks to wait until postgres has started
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
     env:
       NOXSESSION: ${{ matrix.session }}
       FORCE_COLOR: "1"
       PRE_COMMIT_COLOR: "always"
+      POSTGRESQL_PASSWORD: "postgres"
 
     steps:
       - name: Check out the repository

noxfile.py

@@ -139,12 +139,25 @@ def safety(session: Session) -> None:
 
 
 @session(python=python_versions)
-def tests(session: Session) -> None:
+@nox.parametrize("database", ["sqlite", "postgresql"])
+def tests(session: Session, database: str) -> None:
     """Run the test suite."""
     session.install(".")
     session.install("coverage[toml]", "pytest", "pygments", "pytest-django", "faker")
+
+    db_args = [f"--db-vendor={database}"]
+
+    if database == "postgresql":
+        session.install("psycopg2")
+        for setting in ["name", "user", "password", "host", "port"]:
+            value = os.getenv(f"postgresql_{setting}".upper())
+            if value:
+                db_args.append(f"--db-{setting}={value}")
+
     try:
-        session.run("coverage", "run", "--parallel", "-m", "pytest", *session.posargs)
+        session.run(
+            "coverage", "run", "--parallel", "-m", "pytest", *db_args, *session.posargs
+        )
     finally:
         if session.interactive:
             session.notify("coverage", posargs=[])