diff --git a/setup_fingerprint_logging/tests/test_core.py b/setup_fingerprint_logging/tests/test_core.py
new file mode 100644
index 0000000..a70bc81
--- /dev/null
+++ b/setup_fingerprint_logging/tests/test_core.py
@@ -0,0 +1,39 @@
+import pytest
+from setup_fingerprint_logging import core
+
+
+def test_generate_setup_fingerprint_deterministic():
+    params = {
+        'policy_hash': 'abc123',
+        'runner_image': 'ubuntu22',
+        'kernel': '6.8.12',
+        'python_version': '3.11.4',
+        'gate_version': 'v2.3.1'
+    }
+    result1 = core.generate_setup_fingerprint(**params)
+    result2 = core.generate_setup_fingerprint(**params)
+    assert isinstance(result1, str)
+    assert result1 == result2, "Fingerprint should be deterministic for identical input"
+    assert len(result1) >= 32, "Fingerprint should have expected hash length"
+
+
+def test_generate_setup_fingerprint_unique_for_different_inputs():
+    base_params = {
+        'policy_hash': 'abc123',
+        'runner_image': 'ubuntu22',
+        'kernel': '6.8.12',
+        'python_version': '3.11.4',
+        'gate_version': 'v2.3.1'
+    }
+    modified_params = base_params.copy()
+    modified_params['policy_hash'] = 'xyz789'
+    result_base = core.generate_setup_fingerprint(**base_params)
+    result_modified = core.generate_setup_fingerprint(**modified_params)
+    assert result_base != result_modified, "Different inputs should yield different fingerprints"
+
+
+def test_generate_setup_fingerprint_input_validation():
+    with pytest.raises((TypeError, ValueError)):
+        core.generate_setup_fingerprint(None, 'runner', 'kernel', 'python', 'gate')
+    with pytest.raises((TypeError, ValueError)):
+        core.generate_setup_fingerprint('policy', '', 'kernel', 'python', 'gate')