Add files via upload (#15)

Author: AmirhosseinHonardoust

tests/test_app_dashboard.py

@@ -0,0 +1,62 @@
+from __future__ import annotations
+
+import unittest
+
+import numpy as np
+
+try:
+    import shap  # noqa: F401
+    import streamlit  # noqa: F401
+
+    HAS_DASHBOARD_DEPS = True
+except Exception:  # pragma: no cover - streamlit/shap are optional heavy deps
+    HAS_DASHBOARD_DEPS = False
+
+
+@unittest.skipUnless(HAS_DASHBOARD_DEPS, "streamlit and shap are required")
+class AppDashboardTests(unittest.TestCase):
+    """Smoke tests for app.py helpers; skipped cleanly without streamlit/shap."""
+
+    def test_plot_single_shap_bar_returns_figure(self) -> None:
+        import matplotlib
+
+        matplotlib.use("Agg")
+        import matplotlib.figure
+
+        import app
+
+        shap_values = np.array([0.5, -0.3, 0.1, 0.0, 0.2])
+        feature_names = np.array(["f0", "f1", "f2", "f3", "f4"])
+
+        fig = app.plot_single_shap_bar(shap_values, feature_names, max_features=3)
+        self.assertIsInstance(fig, matplotlib.figure.Figure)
+
+    def test_explain_single_transaction_end_to_end(self) -> None:
+        import matplotlib
+
+        matplotlib.use("Agg")
+        import matplotlib.figure
+
+        import app
+        from src.config import TARGET_COL
+        from src.features import build_pipeline
+        from src.generate_synthetic_data import generate_synthetic_fraud_dataset
+        from src.score_new_transactions import score_dataframe
+
+        df = generate_synthetic_fraud_dataset(n_samples=300, fraud_rate=0.2, seed=5)
+        X = df.drop(columns=[TARGET_COL])
+        y = df[TARGET_COL]
+
+        model = build_pipeline()
+        model.fit(X, y)
+
+        scored = score_dataframe(df, threshold=0.5, model=model)
+        fig, reasons = app.explain_single_transaction(model, scored, 0)
+
+        self.assertIsInstance(fig, matplotlib.figure.Figure)
+        self.assertIsInstance(reasons, list)
+        self.assertTrue(len(reasons) > 0)
+
+
+if __name__ == "__main__":
+    unittest.main()