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-rw-r--r--js/src/tests/non262/Date/equality-to-boolean.js39
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diff --git a/js/src/tests/non262/Date/equality-to-boolean.js b/js/src/tests/non262/Date/equality-to-boolean.js
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+++ b/js/src/tests/non262/Date/equality-to-boolean.js
@@ -0,0 +1,39 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+print("Test for correct implementation of |Date == boolean| and vice versa");
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+Date.prototype.toString = function() { return 1; };
+Date.prototype.valueOf = function() { return 0; };
+
+/*
+ * ES5 11.9.3 doesn't directly handle obj == boolean. Instead it translates it
+ * as follows:
+ *
+ * obj == boolean
+ * ↳ obj == ToNumber(boolean), per step 7
+ * ↳ ToPrimitive(obj) == ToNumber(boolean), per step 9
+ *
+ * ToPrimitive calls [[DefaultValue]] with no hint. For Date objects this is
+ * treated as if it were instead called with hint String. That calls toString,
+ * which returns 1, so Date objects here should compare equal to true and
+ * unequal to false.
+ */
+assertEq(new Date == true, true);
+assertEq(new Date == false, false);
+
+/* == is symmetric. */
+assertEq(true == new Date, true);
+assertEq(false == new Date, false);
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+ reportCompare(true, true);
+
+print("Tests complete");