Add (not fully working) tests for use_best_match

tests/unit/config/test_configcommands.py

@@ -25,7 +25,7 @@ import pytest
 from PyQt5.QtCore import QUrl, QProcess
 
 from qutebrowser.config import configcommands
-from qutebrowser.commands import cmdexc
+from qutebrowser.commands import cmdexc, runners
 from qutebrowser.utils import usertypes
 from qutebrowser.misc import objects
 
@@ -532,3 +532,32 @@ class TestBind:
         """
         with pytest.raises(cmdexc.CommandError, match=expected):
             commands.unbind(key, mode=mode)
+
+
+class TestCompletions:
+
+    """Tests for completions.use_best_match."""
+
+    def test_dont_use_best_match(self, config_stub, monkeypatch):
+        """Test multiple completion options with use_best_match set to false.
+
+        Should raise NoSuchCommandError
+        """
+        config_stub.val.completion.use_best_match = False
+        monkeypatch.setattr('qutebrowser.config', config_stub)
+        parser = runners.CommandParser(partial_match=True)
+
+        with pytest.raises(cmdexc.NoSuchCommandError):
+            result = parser.parse('do')
+
+    def test_use_best_match(self, config_stub, monkeypatch):
+        """Test multiple completion options with use_best_match set to true.
+
+        The resulting command should be the best match
+        """
+        config_stub.val.completion.use_best_match = True
+        monkeypatch.setattr('qutebrowser.config', config_stub)
+        parser = runners.CommandParser(partial_match=True)
+
+        result = parser.parse('do')
+        assert result.cmd.name == 'download'