Add gate_decision/tests/test_core.py

gate_decision/tests/test_core.py

@@ -0,0 +1,58 @@
+import pytest
+import json
+from gate_decision import core
+
+@pytest.fixture
+def valid_summary_pass():
+    return {
+        "mischfenster_p95": 0.8,
+        "retry_free_in_window_rate": 0.99,
+        "max_value": 1.2
+    }
+
+@pytest.fixture
+def valid_summary_fail():
+    return {
+        "mischfenster_p95": 5.0,
+        "retry_free_in_window_rate": 0.5,
+        "max_value": 10.0
+    }
+
+@pytest.fixture
+def invalid_summary():
+    return {
+        "mischfenster_p95": "invalid",
+        "retry_free_in_window_rate": 0.9
+    }
+
+def test_make_decision_pass(valid_summary_pass):
+    result = core.make_decision(valid_summary_pass)
+    assert isinstance(result, dict)
+    assert result.get("decision") == "pass"
+    assert "explanation" in result
+
+
+def test_make_decision_fail(valid_summary_fail):
+    result = core.make_decision(valid_summary_fail)
+    assert isinstance(result, dict)
+    assert result.get("decision") == "fail"
+    assert "explanation" in result
+
+
+def test_make_decision_invalid_type(invalid_summary):
+    with pytest.raises((AssertionError, ValueError, TypeError)):
+        _ = core.make_decision(invalid_summary)
+
+
+def test_deterministic_behavior(valid_summary_pass):
+    result1 = core.make_decision(valid_summary_pass)
+    result2 = core.make_decision(valid_summary_pass)
+    assert result1 == result2
+
+
+def test_output_is_json_serializable(valid_summary_pass):
+    result = core.make_decision(valid_summary_pass)
+    json_str = json.dumps(result)
+    assert isinstance(json_str, str)
+    decoded = json.loads(json_str)
+    assert decoded == result