Create tests/test_app.py

tests/test_app.py

@@ -0,0 +1,34 @@
+import pytest
+from app import app
+
+
+@pytest.fixture
+def client():
+app.config.update({"TESTING": True})
+with app.test_client() as client:
+yield client
+
+
+def test_index_page(client):
+resp = client.get("/")
+assert resp.status_code == 200
+assert b"Komoditas logam" in resp.data
+
+
+def test_predict_invalid(client):
+resp = client.post("/predict", data={"commodity": "unknownmetal"}, follow_redirects=True)
+assert resp.status_code == 200
+# Should flash an error message in Indonesian
+assert b"Tidak menemukan simbol" in resp.data or b"Data historis" in resp.data
+
+
+# Ensure templates only use ASCII in titles
+import re
+
+
+def test_ascii_titles():
+with open("templates/base.html", "r", encoding="utf-8") as f:
+html = f.read()
+# Ensure no bullet character
+assert "\u2022" not in html
+# ======================= end tests/test_app.py ===============================