4 files changed, 259 insertions, 0 deletions
diff --git a/tests/meta_hooks/__init__.py b/tests/meta_hooks/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/meta_hooks/__init__.py
diff --git a/tests/meta_hooks/check_hooks_apply_test.py b/tests/meta_hooks/check_hooks_apply_test.py
new file mode 100644
index 0000000..06bdd04
--- /dev/null
+++ b/tests/meta_hooks/check_hooks_apply_test.py
@@ -0,0 +1,138 @@
+from pre_commit.meta_hooks import check_hooks_apply
+from testing.fixtures import add_config_to_repo
+
+
+def test_hook_excludes_everything(capsys, in_git_dir, mock_store_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_hooks_apply.main(()) == 1
+
+    out, _ = capsys.readouterr()
+    assert 'check-useless-excludes does not apply to this repository' in out
+
+
+def test_hook_includes_nothing(capsys, in_git_dir, mock_store_dir):
+    config = {
+        'repos': [
+            {
+                'repo': 'meta',
+                'hooks': [
+                    {
+                        'id': 'check-useless-excludes',
+                        'files': 'foo',
+                    },
+                ],
+            },
+        ],
+    }
+
+    add_config_to_repo(in_git_dir.strpath, config)
+
+    assert check_hooks_apply.main(()) == 1
+
+    out, _ = capsys.readouterr()
+    assert 'check-useless-excludes does not apply to this repository' in out
+
+
+def test_hook_types_not_matched(capsys, in_git_dir, mock_store_dir):
+    config = {
+        'repos': [
+            {
+                'repo': 'meta',
+                'hooks': [
+                    {
+                        'id': 'check-useless-excludes',
+                        'types': ['python'],
+                    },
+                ],
+            },
+        ],
+    }
+
+    add_config_to_repo(in_git_dir.strpath, config)
+
+    assert check_hooks_apply.main(()) == 1
+
+    out, _ = capsys.readouterr()
+    assert 'check-useless-excludes does not apply to this repository' in out
+
+
+def test_hook_types_excludes_everything(capsys, in_git_dir, mock_store_dir):
+    config = {
+        'repos': [
+            {
+                'repo': 'meta',
+                'hooks': [
+                    {
+                        'id': 'check-useless-excludes',
+                        'exclude_types': ['yaml'],
+                    },
+                ],
+            },
+        ],
+    }
+
+    add_config_to_repo(in_git_dir.strpath, config)
+
+    assert check_hooks_apply.main(()) == 1
+
+    out, _ = capsys.readouterr()
+    assert 'check-useless-excludes does not apply to this repository' in out
+
+
+def test_valid_exceptions(capsys, in_git_dir, mock_store_dir):
+    config = {
+        'repos': [
+            {
+                'repo': 'local',
+                'hooks': [
+                    # applies to a file
+                    {
+                        'id': 'check-yaml',
+                        'name': 'check yaml',
+                        'entry': './check-yaml',
+                        'language': 'script',
+                        'files': r'\.yaml$',
+                    },
+                    # Should not be reported as an error due to language: fail
+                    {
+                        'id': 'changelogs-rst',
+                        'name': 'changelogs must be rst',
+                        'entry': 'changelog filenames must end in .rst',
+                        'language': 'fail',
+                        'files': r'changelog/.*(?<!\.rst)$',
+                    },
+                    # Should not be reported as an error due to always_run
+                    {
+                        'id': 'i-always-run',
+                        'name': 'make check',
+                        'entry': 'make check',
+                        'language': 'system',
+                        'files': '^$',
+                        'always_run': True,
+                    },
+                ],
+            },
+        ],
+    }
+
+    add_config_to_repo(in_git_dir.strpath, config)
+
+    assert check_hooks_apply.main(()) == 0
+
+    out, _ = capsys.readouterr()
+    assert out == ''
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 == ''
diff --git a/tests/meta_hooks/identity_test.py b/tests/meta_hooks/identity_test.py
new file mode 100644
index 0000000..3eff00b
--- /dev/null
+++ b/tests/meta_hooks/identity_test.py
@@ -0,0 +1,6 @@
+from pre_commit.meta_hooks import identity
+
+
+def test_identity(cap_out):
+    assert not identity.main(('a', 'b', 'c'))
+    assert cap_out.get() == 'a\nb\nc\n'