1 files changed, 29 insertions, 0 deletions
diff --git a/js/src/tests/test262/annexB/language/expressions/strict-equals/emulates-undefined.js b/js/src/tests/test262/annexB/language/expressions/strict-equals/emulates-undefined.js
new file mode 100644
index 0000000000..67c6603cdd
--- /dev/null
+++ b/js/src/tests/test262/annexB/language/expressions/strict-equals/emulates-undefined.js
@@ -0,0 +1,29 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-equality-operators-runtime-semantics-evaluation
+description: >
+  Strict Equality Comparison doesn't special-case [[IsHTMLDDA]] objects.
+info: |
+  EqualityExpression : EqualityExpression === RelationalExpression 
+
+  [...]
+  5. Return the result of performing Strict Equality Comparison rval === lval.
+
+  Strict Equality Comparison
+
+  1. If Type(x) is different from Type(y), return false.
+features: [IsHTMLDDA]
+---*/
+
+var IsHTMLDDA = $262.IsHTMLDDA;
+
+assert.sameValue(IsHTMLDDA === undefined, false, "=== with `undefined`");
+assert.sameValue(undefined === IsHTMLDDA, false, "=== with `undefined`");
+
+assert.sameValue(IsHTMLDDA === null, false, "=== with `null`");
+assert.sameValue(null === IsHTMLDDA, false, "=== with `null`");
+
+assert(IsHTMLDDA === IsHTMLDDA);
+
+reportCompare(0, 0);