quoted-strings: Add test_allow_quoted_quotes()

tests/rules/test_quoted_strings.py

@@ -453,3 +453,35 @@ class QuotedTestCase(RuleTestCase):
                    '- "0o800"\n',
                    conf,
                    problem1=(9, 3), problem2=(10, 3))
+
+    def test_allow_quoted_quotes(self):
+        for quote_type in ['single', 'double']:
+            for required in ['true', 'false', 'only-when-needed']:
+                for allow_quoted_quotes in ['true', 'false']:
+                    conf = ('quoted-strings: {quote-type: %s,\n'
+                            '                 required: %s,\n'
+                            '                 allow-quoted-quotes: %s}\n') % (
+                                quote_type, required, allow_quoted_quotes)
+
+                    wrong_token_style = "'" if quote_type == 'double' else '"'
+                    right_token_style = '"' if quote_type == 'double' else "'"
+
+                    # 'fooX' value is in square brackets to avoid
+                    # 'redundantly quoted' error
+                    # in 'required: only-when-needed' mode
+                    yaml_to_check = ('---\n'
+                                     # `foo1: "[barbaz]"` `foo1: '[barbaz]'`
+                                     'foo1: %(w)c[barbaz]%(w)c\n'
+                                     # `foo1: "[bar'baz]"` `foo1: '[bar"baz]'`
+                                     'foo2: %(w)c[bar%(r)cbaz]%(w)c\n'
+                                     ) % {'w': wrong_token_style,
+                                          'r': right_token_style}
+
+                    if allow_quoted_quotes == 'false':
+                        self.check(yaml_to_check,
+                                   conf,
+                                   problem1=(2, 7),
+                                   problem2=(3, 7))
+                    else:
+                        self.check(yaml_to_check,
+                                   conf, problem1=(2, 7))