run-sub-hooks hook added

tests/run_sub_hooks_test.py

@@ -0,0 +1,55 @@
+import re
+
+import pytest
+
+from pre_commit_hooks.run_sub_hooks import main
+
+
+@pytest.fixture
+def temp_sub_dir(temp_git_dir):
+    """Temporary git subdirectory with pre-commit config inside of it"""
+    with temp_git_dir.as_cwd():
+        sub_dir = temp_git_dir.mkdir('subdir')
+        sub_dir.join('.pre-commit-config.yaml').write(
+            """\
+repos:
+        -   repo: https://github.com/pre-commit/pre-commit-hooks
+            rev: v2.0.0
+            hooks:
+            -   id: trailing-whitespace\
+"""
+        )
+        yield sub_dir
+
+
+INFO_PATTERN = re.compile(r'^\s*(\[INFO\] [^\n]+\n)+', flags=re.M)
+
+
+def test_clean_run(temp_sub_dir, capfd):
+    assert main(['--target', str(temp_sub_dir), '--all-files']) == 0
+    captured = capfd.readouterr()
+    assert (  # noqa: E501
+        INFO_PATTERN.sub('', captured.out) ==
+        """\
+Trim Trailing Whitespace.................................................Passed
+"""
+    )
+    assert captured.err == ''
+
+
+def test_only_sub_dir_files_when_all_files(temp_git_dir, temp_sub_dir, capfd):
+    temp_git_dir.join('file1.yaml').write('some trailing whitespace ->    ')
+    temp_sub_dir.join('file2.yaml').write('some trailing whitespace ->    ')
+    assert main(['--target', str(temp_sub_dir), '--all-files']) == 1
+    captured = capfd.readouterr()
+    assert (  # noqa: E501
+        INFO_PATTERN.sub('', captured.out) ==
+        """\
+Trim Trailing Whitespace.................................................Failed
+hookid: trailing-whitespace
+
+Fixing subdir/file2.yaml
+
+"""
+    )
+    assert captured.err == ''