diff --git a/setup_fingerprint_check/tests/test_core.py b/setup_fingerprint_check/tests/test_core.py
new file mode 100644
index 0000000..f8cb93a
--- /dev/null
+++ b/setup_fingerprint_check/tests/test_core.py
@@ -0,0 +1,38 @@
+import pytest
+
+import hashlib
+import os
+from setup_fingerprint_check import core
+
+def generate_mock_fingerprint(env_data: str) -> str:
+    return hashlib.sha256(env_data.encode()).hexdigest()
+
+@pytest.fixture
+def valid_env(monkeypatch):
+    # Simulate a deterministic environment for hashing
+    mock_env = {
+        'KERNEL_VERSION': '5.15.0-91-generic',
+        'PYTHON_VERSION': '3.11.2',
+        'RUNNER': 'CI-Linux'
+    }
+    for key, value in mock_env.items():
+        monkeypatch.setenv(key, value)
+    env_str = '|'.join(f"{k}={v}" for k, v in sorted(mock_env.items()))
+    expected = generate_mock_fingerprint(env_str)
+    return expected, mock_env
+
+def test_check_setup_fingerprint_valid(monkeypatch, valid_env):
+    expected_fingerprint, mock_env = valid_env
+    # Patch os.environ to simulate runtime environment
+    monkeypatch.setattr(os, 'environ', mock_env)
+    assert core.check_setup_fingerprint(expected_fingerprint) is True
+
+def test_check_setup_fingerprint_mismatch(monkeypatch, valid_env):
+    expected_fingerprint, mock_env = valid_env
+    monkeypatch.setattr(os, 'environ', {**mock_env, 'PYTHON_VERSION': '3.10.9'})
+    assert core.check_setup_fingerprint(expected_fingerprint) is False
+
+def test_check_setup_fingerprint_type_validation():
+    with pytest.raises(AssertionError):
+        # Non-string input to test assertion from ci_ready input-validation requirement
+        core.check_setup_fingerprint(12345)  # type: ignore