1 files changed, 115 insertions, 0 deletions
diff --git a/tests/meta_hooks/check_useless_excludes_test.py b/tests/meta_hooks/check_useless_excludes_test.py
new file mode 100644
index 0000000..d261e81
--- /dev/null
+++ b/tests/meta_hooks/check_useless_excludes_test.py
@@ -0,0 +1,115 @@
+from pre_commit.meta_hooks import check_useless_excludes
+from testing.fixtures import add_config_to_repo
+
+
+def test_useless_exclude_global(capsys, in_git_dir):
+    config = {
+        'exclude': 'foo',
+        'repos': [
+            {
+                'repo': 'meta',
+                'hooks': [{'id': 'check-useless-excludes'}],
+            },
+        ],
+    }
+
+    add_config_to_repo(in_git_dir.strpath, config)
+
+    assert check_useless_excludes.main(()) == 1
+
+    out, _ = capsys.readouterr()
+    out = out.strip()
+    assert "The global exclude pattern 'foo' does not match any files" == out
+
+
+def test_useless_exclude_for_hook(capsys, in_git_dir):
+    config = {
+        'repos': [
+            {
+                'repo': 'meta',
+                'hooks': [{'id': 'check-useless-excludes', 'exclude': 'foo'}],
+            },
+        ],
+    }
+
+    add_config_to_repo(in_git_dir.strpath, config)
+
+    assert check_useless_excludes.main(()) == 1
+
+    out, _ = capsys.readouterr()
+    out = out.strip()
+    expected = (
+        "The exclude pattern 'foo' for check-useless-excludes "
+        'does not match any files'
+    )
+    assert expected == out
+
+
+def test_useless_exclude_with_types_filter(capsys, in_git_dir):
+    config = {
+        'repos': [
+            {
+                'repo': 'meta',
+                'hooks': [
+                    {
+                        'id': 'check-useless-excludes',
+                        'exclude': '.pre-commit-config.yaml',
+                        'types': ['python'],
+                    },
+                ],
+            },
+        ],
+    }
+
+    add_config_to_repo(in_git_dir.strpath, config)
+
+    assert check_useless_excludes.main(()) == 1
+
+    out, _ = capsys.readouterr()
+    out = out.strip()
+    expected = (
+        "The exclude pattern '.pre-commit-config.yaml' for "
+        'check-useless-excludes does not match any files'
+    )
+    assert expected == out
+
+
+def test_no_excludes(capsys, in_git_dir):
+    config = {
+        'repos': [
+            {
+                'repo': 'meta',
+                'hooks': [{'id': 'check-useless-excludes'}],
+            },
+        ],
+    }
+
+    add_config_to_repo(in_git_dir.strpath, config)
+
+    assert check_useless_excludes.main(()) == 0
+
+    out, _ = capsys.readouterr()
+    assert out == ''
+
+
+def test_valid_exclude(capsys, in_git_dir):
+    config = {
+        'repos': [
+            {
+                'repo': 'meta',
+                'hooks': [
+                    {
+                        'id': 'check-useless-excludes',
+                        'exclude': '.pre-commit-config.yaml',
+                    },
+                ],
+            },
+        ],
+    }
+
+    add_config_to_repo(in_git_dir.strpath, config)
+
+    assert check_useless_excludes.main(()) == 0
+
+    out, _ = capsys.readouterr()
+    assert out == ''