Move commands into their own files.

tests/commands/install_test.py

@@ -0,0 +1,25 @@
+from __future__ import unicode_literals
+
+import io
+import os
+import os.path
+import pkg_resources
+import stat
+
+from pre_commit.commands.install import install
+from pre_commit.runner import Runner
+
+
+def test_install_pre_commit(empty_git_dir):
+    runner = Runner(empty_git_dir)
+    ret = install(runner)
+    assert ret == 0
+    assert os.path.exists(runner.pre_commit_path)
+    pre_commit_contents = io.open(runner.pre_commit_path).read()
+    pre_commit_sh = pkg_resources.resource_filename(
+        'pre_commit', 'resources/pre-commit.sh',
+    )
+    expected_contents = io.open(pre_commit_sh).read()
+    assert pre_commit_contents == expected_contents
+    stat_result = os.stat(runner.pre_commit_path)
+    assert stat_result.st_mode & (stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)