#334: Don't wait for all rules before showing result

tests/test_types.py

@@ -1,5 +1,6 @@
-from thefuck.types import RulesNamesList, Settings
-from tests.utils import Rule
+from thefuck.types import RulesNamesList, Settings, \
+    SortedCorrectedCommandsSequence
+from tests.utils import Rule, CorrectedCommand
 
 
 def test_rules_names_list():
@@ -15,3 +16,31 @@ def test_update_settings():
     assert new_settings.key == 'val'
     assert new_settings.unset == 'unset-value'
     assert settings.key == 'val'
+
+
+class TestSortedCorrectedCommandsSequence(object):
+    def test_realises_generator_only_on_demand(self, settings):
+        should_realise = False
+
+        def gen():
+            nonlocal should_realise
+            yield CorrectedCommand('git commit')
+            yield CorrectedCommand('git branch', priority=200)
+            assert should_realise
+            yield CorrectedCommand('git checkout', priority=100)
+
+        commands = SortedCorrectedCommandsSequence(gen(), settings)
+        assert commands[0] == CorrectedCommand('git commit')
+        should_realise = True
+        assert commands[1] == CorrectedCommand('git checkout', priority=100)
+        assert commands[2] == CorrectedCommand('git branch', priority=200)
+
+    def test_remove_duplicates(self, settings):
+        side_effect = lambda *_: None
+        seq = SortedCorrectedCommandsSequence(
+            iter([CorrectedCommand('ls', priority=100),
+                  CorrectedCommand('ls', priority=200),
+                  CorrectedCommand('ls', side_effect, 300)]),
+            settings)
+        assert set(seq) == {CorrectedCommand('ls', priority=100),
+                            CorrectedCommand('ls', side_effect, 300)}