Add a support for brew unavailable formulas

tests/rules/test_brew_install.py

@@ -0,0 +1,49 @@
+import pytest
+from thefuck.types import Command
+from thefuck.rules.brew_install import match, get_new_command
+from thefuck.rules.brew_install import brew_formulas
+
+
+@pytest.fixture
+def brew_no_available_formula():
+    return '''Error: No available formula for elsticsearch '''
+
+
+@pytest.fixture
+def brew_install_no_argument():
+    return '''This command requires a formula argument'''
+
+
+@pytest.fixture
+def brew_already_installed():
+    return '''Warning: git-2.3.5 already installed'''
+
+
+def _is_not_okay_to_test():
+    if 'elasticsearch' not in brew_formulas:
+        return True
+    return False
+
+
+@pytest.mark.skipif(_is_not_okay_to_test(),
+                    reason='No need to run if there\'s no formula')
+def test_match(brew_no_available_formula, brew_already_installed,
+               brew_install_no_argument):
+    assert match(Command('brew install elsticsearch', '',
+                         brew_no_available_formula), None)
+    assert not match(Command('brew install git', '',
+                             brew_already_installed), None)
+    assert not match(Command('brew install', '', brew_install_no_argument),
+                     None)
+
+
+@pytest.mark.skipif(_is_not_okay_to_test(),
+                    reason='No need to run if there\'s no formula')
+def test_get_new_command(brew_no_available_formula):
+    assert get_new_command(Command('brew install elsticsearch', '',
+                                   brew_no_available_formula), None)\
+        == 'brew install elasticsearch'
+
+    assert get_new_command(Command('brew install aa', '',
+                                   brew_no_available_formula),
+                           None) != 'brew install aha'