#652: Add new git_push_different_branch_names rule

Fix #652

* Basic fix for #652
* Finishing work
* Added readme line
* Added test
* My test was stupid...
* Removed redundant lines
* That space...

tests/rules/test_git_push_different_branch_names.py

@@ -0,0 +1,39 @@
+import pytest
+from thefuck.rules.git_push_different_branch_names import get_new_command, match
+from thefuck.types import Command
+
+
+output = """fatal: The upstream branch of your current branch does not match
+the name of your current branch.  To push to the upstream branch
+on the remote, use
+
+    git push origin HEAD:%s
+
+To push to the branch of the same name on the remote, use
+
+    git push origin %s
+
+To choose either option permanently, see push.default in 'git help config'.
+"""
+
+
+def error_msg(localbranch, remotebranch):
+    return output % (remotebranch, localbranch)
+
+
+def test_match():
+    assert match(Command('git push', error_msg('foo', 'bar')))
+
+
+@pytest.mark.parametrize('command', [
+    Command('vim', ''),
+    Command('git status', error_msg('foo', 'bar')),
+    Command('git push', '')
+])
+def test_not_match(command):
+    assert not match(command)
+
+
+def test_get_new_command():
+    new_command = get_new_command(Command('git push', error_msg('foo', 'bar')))
+    assert new_command == 'git push origin HEAD:bar'