Add some tests for key config migrations.

tests/config/test_config.py

@@ -190,6 +190,37 @@ class TestKeyConfigParser:
         """Make sure the default config contains no deprecated commands."""
         assert rgx.match(command) is None
 
+    @pytest.mark.parametrize(
+        'old, new_expected',
+        [
+            ('open -t about:blank', 'open -t'),
+            ('open -w about:blank', 'open -w'),
+            ('open -b about:blank', 'open -b'),
+            ('open about:blank', None),
+            ('open -t example.com', None),
+            ('download-page', 'download'),
+            ('cancel-download', 'download-cancel'),
+            ('search ""', 'search'),
+            ("search ''", 'search'),
+            ('search "foo"', None),
+            ('set-cmd-text "foo bar"', 'set-cmd-text foo bar'),
+            ("set-cmd-text 'foo bar'", 'set-cmd-text foo bar'),
+            ('set-cmd-text foo bar', None),
+            ('set-cmd-text "foo bar "', 'set-cmd-text -s foo bar'),
+            ("set-cmd-text 'foo bar '", 'set-cmd-text -s foo bar'),
+        ]
+    )
+    def test_migrations(self, old, new_expected):
+        """Make sure deprecated commands get migrated correctly."""
+        if new_expected is None:
+            new_expected = old
+        new = old
+        for rgx, repl in configdata.CHANGED_KEY_COMMANDS:
+            if rgx.match(new):
+                new = rgx.sub(repl, new)
+                break
+        assert new == new_expected
+
 
 class TestDefaultConfig: