Add detect_secret_token

tests/detect_secret_token_test.py

@@ -0,0 +1,36 @@
+from __future__ import annotations
+
+import pytest
+
+from pre_commit_hooks.detect_secret_token import main
+
+
+@pytest.mark.parametrize(
+    ('input', 'expected'),
+    (
+        pytest.param(
+            'There is no secret here',
+            0,
+            id='no secret-token',
+        ),
+        pytest.param(
+            'There is no secret here ☃',
+            0,
+            id='no secret-token unicode',
+        ),
+        pytest.param(
+            'Read about using "secret-token:" in RFC 8959',
+            0,
+            id='has secret-token prefix only',
+        ),
+        pytest.param(
+            'secret-token:E92FB7EB-D882-47A4-A265-A0B6135DC842%20foo',
+            1,
+            id='has secret-token',
+        ),
+    ),
+)
+def test_main(input, expected, tmpdir):
+    path = tmpdir.join('file.txt')
+    path.write(input)
+    assert main([str(path)]) == expected