tests/e2e/test_hello_app.py

@@ -0,0 +1,26 @@
+import pytest
+
+flask = pytest.importorskip("flask")
+
+
+def _client() -> "flask.testing.FlaskClient":
+    from flask_day_54.presentation.hello import app
+
+    return app.test_client()
+
+
+def test_root_returns_greeting_when_get() -> None:
+    response = _client().get("/")
+
+    assert response.status_code == 200
+    assert response.get_data(as_text=True) == "Hello, World!"
+
+
+def test_unknown_path_returns_404() -> None:
+    assert _client().get("/missing").status_code == 404
+
+
+def test_root_content_type_is_html() -> None:
+    response = _client().get("/")
+
+    assert response.content_type.startswith("text/html")

tests/unit/test_get_greeting.py

@@ -0,0 +1,5 @@
+from flask_day_54.application.get_greeting import get_greeting
+
+
+def test_get_greeting_returns_hello_world() -> None:
+    assert get_greeting() == "Hello, World!"