1 files changed, 94 insertions, 0 deletions
diff --git a/dom/bindings/parser/tests/test_typedef.py b/dom/bindings/parser/tests/test_typedef.py
new file mode 100644
index 0000000000..8179f90d5c
--- /dev/null
+++ b/dom/bindings/parser/tests/test_typedef.py
@@ -0,0 +1,94 @@
+def WebIDLTest(parser, harness):
+    parser.parse(
+        """
+      typedef long mylong;
+      typedef long? mynullablelong;
+      interface Foo {
+        const mylong X = 5;
+        undefined foo(optional mynullablelong arg = 7);
+        undefined bar(optional mynullablelong arg = null);
+        undefined baz(mylong arg);
+      };
+    """
+    )
+
+    results = parser.finish()
+
+    harness.check(
+        results[2].members[1].signatures()[0][1][0].type.name,
+        "LongOrNull",
+        "Should expand typedefs",
+    )
+
+    parser = parser.reset()
+    threw = False
+    try:
+        parser.parse(
+            """
+          typedef long? mynullablelong;
+          interface Foo {
+            undefined foo(mynullablelong? Y);
+          };
+        """
+        )
+        results = parser.finish()
+    except Exception:
+        threw = True
+
+    harness.ok(threw, "Should have thrown on nullable inside nullable arg.")
+
+    parser = parser.reset()
+    threw = False
+    try:
+        parser.parse(
+            """
+          typedef long? mynullablelong;
+          interface Foo {
+            const mynullablelong? X = 5;
+          };
+        """
+        )
+        results = parser.finish()
+    except Exception:
+        threw = True
+
+    harness.ok(threw, "Should have thrown on nullable inside nullable const.")
+
+    parser = parser.reset()
+    threw = False
+    try:
+        parser.parse(
+            """
+          interface Foo {
+            const mynullablelong? X = 5;
+          };
+          typedef long? mynullablelong;
+        """
+        )
+        results = parser.finish()
+    except Exception:
+        threw = True
+
+    harness.ok(
+        threw,
+        "Should have thrown on nullable inside nullable const typedef "
+        "after interface.",
+    )
+
+    parser = parser.reset()
+    parser.parse(
+        """
+      interface Foo {
+        const mylong X = 5;
+      };
+      typedef long mylong;
+    """
+    )
+
+    results = parser.finish()
+
+    harness.check(
+        results[0].members[0].type.name,
+        "Long",
+        "Should expand typedefs that come before interface",
+    )