1 files changed, 38 insertions, 0 deletions
diff --git a/js/src/tests/test262/ch11/11.13/11.13.2/S11.13.2_A4.5_T1.4.js b/js/src/tests/test262/ch11/11.13/11.13.2/S11.13.2_A4.5_T1.4.js
new file mode 100644
index 000000000..28a9d2d76
--- /dev/null
+++ b/js/src/tests/test262/ch11/11.13/11.13.2/S11.13.2_A4.5_T1.4.js
@@ -0,0 +1,38 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/**
+ * The production x -= y is the same as x = x - y
+ *
+ * @path ch11/11.13/11.13.2/S11.13.2_A4.5_T1.4.js
+ * @description Type(x) and Type(y) vary between Null and Undefined
+ */
+
+//CHECK#1
+x = null;
+x -= undefined;
+if (isNaN(x) !== true) {
+  $ERROR('#1: x = null; x -= undefined; x === Not-a-Number. Actual: ' + (x));
+}
+
+//CHECK#2
+x = undefined;
+x -= null;
+if (isNaN(x) !== true) {
+  $ERROR('#2: x = undefined; x -= null; x === Not-a-Number. Actual: ' + (x));
+}
+
+//CHECK#3
+x = undefined;
+x -= undefined;
+if (isNaN(x) !== true) {
+  $ERROR('#3: x = undefined; x -= undefined; x === Not-a-Number. Actual: ' + (x));
+}
+
+//CHECK#4
+x = null;
+x -= null;
+if (x !== 0) {
+  $ERROR('#4: x = null; x -= null; x === 0. Actual: ' + (x));
+}
+