diff -r 000000000000 -r 6474c204b198 dom/bindings/parser/tests/test_callback_interface.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/bindings/parser/tests/test_callback_interface.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,94 @@
+import WebIDL
+
+def WebIDLTest(parser, harness):
+    parser.parse("""
+        callback interface TestCallbackInterface {
+          attribute boolean bool;
+        };
+    """)
+
+    results = parser.finish()
+
+    iface = results[0]
+
+    harness.ok(iface.isCallback(), "Interface should be a callback")
+
+    parser = parser.reset()
+    threw = False
+    try:
+        parser.parse("""
+            interface TestInterface {
+            };
+            callback interface TestCallbackInterface : TestInterface {
+              attribute boolean bool;
+            };
+        """)
+        results = parser.finish()
+    except:
+        threw = True
+
+    harness.ok(threw, "Should not allow non-callback parent of callback interface")
+
+    parser = parser.reset()
+    threw = False
+    try:
+        parser.parse("""
+            interface TestInterface : TestCallbackInterface {
+            };
+            callback interface TestCallbackInterface {
+              attribute boolean bool;
+            };
+        """)
+        results = parser.finish()
+    except:
+        threw = True
+
+    harness.ok(threw, "Should not allow callback parent of non-callback interface")
+
+    parser = parser.reset()
+    parser.parse("""
+        callback interface TestCallbackInterface1 {
+          void foo();
+        };
+        callback interface TestCallbackInterface2 {
+          void foo(DOMString arg);
+          void foo(TestCallbackInterface1 arg);
+        };
+        callback interface TestCallbackInterface3 {
+          void foo(DOMString arg);
+          void foo(TestCallbackInterface1 arg);
+          static void bar();
+        };
+        callback interface TestCallbackInterface4 {
+          void foo(DOMString arg);
+          void foo(TestCallbackInterface1 arg);
+          static void bar();
+          const long baz = 5;
+        };
+        callback interface TestCallbackInterface5 {
+          static attribute boolean bool;
+          void foo();
+        };
+        callback interface TestCallbackInterface6 {
+          void foo(DOMString arg);
+          void foo(TestCallbackInterface1 arg);
+          void bar();
+        };
+        callback interface TestCallbackInterface7 {
+          static attribute boolean bool;
+        };
+        callback interface TestCallbackInterface8 {
+          attribute boolean bool;
+        };
+        callback interface TestCallbackInterface9 : TestCallbackInterface1 {
+          void foo();
+        };
+        callback interface TestCallbackInterface10 : TestCallbackInterface1 {
+          void bar();
+        };
+    """)
+    results = parser.finish()
+    for (i, iface) in enumerate(results):
+      harness.check(iface.isSingleOperationInterface(), i < 4,
+                    "Interface %s should be a single operation interface" %
+                    iface.identifier.name)