1 files changed, 32 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Date/prototype/setDate/arg-coercion-order.js b/js/src/tests/test262/built-ins/Date/prototype/setDate/arg-coercion-order.js
new file mode 100644
index 0000000000..094bec4454
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Date/prototype/setDate/arg-coercion-order.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2021 Kevin Gibbons. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-date.prototype.setdate
+description: Order of coercion of provided argument vs NaN check
+info: |
+  1. Let t be ? thisTimeValue(this value).
+  2. Let dt be ? ToNumber(date).
+  3. If t is NaN, return NaN.
+  4. Set t to LocalTime(t).
+  5. Let newDate be MakeDate(MakeDay(YearFromTime(t), MonthFromTime(t), dt), TimeWithinDay(t)).
+  6. Let u be TimeClip(UTC(newDate)).
+  7. Set the [[DateValue]] internal slot of this Date object to u.
+  8. Return u.
+---*/
+
+var date = new Date(NaN);
+var callCount = 0;
+var arg = {
+  valueOf: function() {
+    callCount += 1;
+    return 0;
+  }
+};
+
+var returnValue = date.setDate(arg);
+
+assert.sameValue(callCount, 1, 'ToNumber invoked exactly once');
+assert.sameValue(returnValue, NaN, 'argument is ignored when `this` is an invalid date');
+assert.sameValue(date.getTime(), NaN, 'argument is ignored when `this` is an invalid date');
+
+reportCompare(0, 0);