Add handler for "is not a git command"

tests/rules/test_git_not_command.py

@@ -0,0 +1,28 @@
+import pytest
+from thefuck.main import Command
+from thefuck.rules.git_not_command import match, get_new_command
+
+
+@pytest.fixture
+def git_not_command():
+    return """git: 'brnch' is not a git command. See 'git --help'.
+
+Did you mean this?
+branch
+"""
+
+
+@pytest.fixture
+def git_command():
+    return "* master"
+
+
+def test_match(git_not_command, git_command):
+    assert match(Command('git brnch', '', git_not_command), None)
+    assert not match(Command('ls brnch', '', git_not_command), None)
+    assert not match(Command('git branch', '', git_command), None)
+
+
+def test_get_new_command(git_not_command):
+    assert get_new_command(Command('git brnch', '', git_not_command), None)\
+        == 'git branch'