1 files changed, 77 insertions, 0 deletions
diff --git a/dom/bindings/parser/tests/test_attr_sequence_type.py b/dom/bindings/parser/tests/test_attr_sequence_type.py
new file mode 100644
index 0000000000..afbc732974
--- /dev/null
+++ b/dom/bindings/parser/tests/test_attr_sequence_type.py
@@ -0,0 +1,77 @@
+def WebIDLTest(parser, harness):
+    threw = False
+    try:
+        parser.parse(
+            """
+            interface AttrSequenceType {
+              attribute sequence<object> foo;
+            };
+        """
+        )
+
+        parser.finish()
+    except Exception:
+        threw = True
+
+    harness.ok(threw, "Attribute type must not be a sequence type")
+
+    parser.reset()
+
+    threw = False
+    try:
+        parser.parse(
+            """
+            interface AttrUnionWithSequenceType {
+              attribute (sequence<object> or DOMString) foo;
+            };
+        """
+        )
+
+        parser.finish()
+    except Exception:
+        threw = True
+
+    harness.ok(threw, "Attribute type must not be a union with a sequence member type")
+
+    parser.reset()
+
+    threw = False
+    try:
+        parser.parse(
+            """
+            interface AttrNullableUnionWithSequenceType {
+              attribute (sequence<object>? or DOMString) foo;
+            };
+        """
+        )
+
+        parser.finish()
+    except Exception:
+        threw = True
+
+    harness.ok(
+        threw,
+        "Attribute type must not be a union with a nullable sequence " "member type",
+    )
+
+    parser.reset()
+
+    threw = False
+    try:
+        parser.parse(
+            "\n"
+            "    interface AttrUnionWithUnionWithSequenceType {\n"
+            "      attribute ((sequence<object> or DOMString) or "
+            "AttrUnionWithUnionWithSequenceType) foo;\n"
+            "    };\n"
+        )
+
+        parser.finish()
+    except Exception:
+        threw = True
+
+    harness.ok(
+        threw,
+        "Attribute type must not be a union type with a union member "
+        "type that has a sequence member type",
+    )