Add Runner interface.

testing/resources/array_yaml_file.yaml

@@ -0,0 +1,2 @@
+- foo
+- bar

testing/resources/consumer_repo/.pre-commit-config.yaml

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+
+-   repo: git@github.com:pre-commit/pre-commit-hooks
+    sha: 76739902911688e8d7b13241409f9facc0e534e4
+    hooks:
+        -   id: pyflakes
+            files: '\.py$'
+        -   id: debug-statements
+            files: '\.py$'
+        -   id: trailing-whitespace
+            files: '\.(py|sh|yaml)$'
+        -   id: name-tests-test
+            files: 'tests/.+\.py$'
+        -   id: end-of-file-fixer
+            files: '\.(py|sh|yaml)$'
+
+-   repo: git@github.com:pre-commit/pre-commit
+    sha: 47b7ca44ed1fcaa83464ed00cef72049ae22c33d
+    hooks:
+        -   id: validate_manifest
+            files: '^manifest.yaml$'
+        -   id: validate_config
+            files: \.pre-commit-config.yaml

testing/resources/node_hooks_repo/bin/main.js

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+#!/usr/bin/env node
+
+console.log('Hello World');

testing/resources/node_hooks_repo/manifest.yaml

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+-   id: foo
+    name: Foo
+    entry: foo
+    language: node

testing/resources/node_hooks_repo/package.json

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+{
+    "name": "foo",
+    "version": "0.0.1",
+    "bin": {"foo": "./bin/main.js"}
+}

testing/resources/non_parseable_yaml_file.yaml

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+foo: "

testing/resources/python_hooks_repo/foo/main.py

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+import sys
+
+def func():
+    print repr(sys.argv[1:])
+    print 'Hello World'
+    return 0

testing/resources/python_hooks_repo/manifest.yaml

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+-   id: foo
+    name: Foo
+    entry: foo
+    language: python

testing/resources/python_hooks_repo/setup.py

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+from setuptools import find_packages
+from setuptools import setup
+
+setup(
+    name='Foo',
+    version='0.0.0',
+    packages=find_packages('.'),
+    entry_points={
+        'console_scripts': ['foo = foo.main:func'],
+    },
+)

testing/resources/valid_yaml_but_invalid_config.yaml

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+
+-   repo: git@github.com:pre-commit/pre-commit-hooks
+    hooks:
+        -   id: pyflakes
+        -   id: jslint
+        -   id: trim_trailing_whitespace
+            files: '*.py'

testing/resources/valid_yaml_but_invalid_manifest.yaml

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+foo: bar

testing/util.py

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+
+import os
+import os.path
+import shutil
+
+
+TESTING_DIR = os.path.abspath(os.path.dirname(__file__))
+
+
+def get_resource_path(path):
+    return os.path.join(TESTING_DIR, 'resources', path)
+
+
+def copy_tree_to_path(src_dir, dest_dir):
+    """Copies all of the things inside src_dir to an already existing dest_dir.
+
+    This looks eerily similar to shutil.copytree, but copytree has no option
+    for not creating dest_dir.
+    """
+    names = os.listdir(src_dir)
+
+    for name in names:
+        srcname = os.path.join(src_dir, name)
+        destname = os.path.join(dest_dir, name)
+
+        if os.path.isdir(srcname):
+            shutil.copytree(srcname, destname)
+        else:
+            shutil.copy(srcname, destname)