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diff --git a/js/src/tests/test262/intl402/Intl/getCanonicalLocales/non-iana-canon.js b/js/src/tests/test262/intl402/Intl/getCanonicalLocales/non-iana-canon.js
new file mode 100644
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+++ b/js/src/tests/test262/intl402/Intl/getCanonicalLocales/non-iana-canon.js
@@ -0,0 +1,81 @@
+// Copyright 2018 André Bargull; Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+// Slip from intl402/Locale/constructor-non-iana-canon.js
+/*---
+esid: sec-intl.getcanonicallocales
+description: >
+    Verifies canonicalization, of specific tags.
+info: |
+    ApplyOptionsToTag( tag, options )
+    10. Return CanonicalizeLanguageTag(tag).
+---*/
+
+// Test some language tags where we know that either CLDR or ICU produce
+// different results compared to the canonicalization specified in RFC 5646.
+var testData = [
+    {
+        tag: "mo",
+        canonical: "ro",
+    },
+    {
+        tag: "es-ES-preeuro",
+    },
+    {
+        tag: "uz-UZ-cyrillic",
+    },
+    {
+        tag: "posix",
+    },
+    {
+        tag: "hi-direct",
+    },
+    {
+        tag: "zh-pinyin",
+    },
+    {
+        tag: "zh-stroke",
+    },
+    {
+        tag: "aar-x-private",
+        // "aar" should be canonicalized into "aa" because "aar" matches the type attribute of
+        // a languageAlias element in 
+        // https://www.unicode.org/repos/cldr/trunk/common/supplemental/supplementalMetadata.xml
+        canonical: "aa-x-private", 
+    },
+    {
+        tag: "heb-x-private",
+        // "heb" should be canonicalized into "he" because "heb" matches the type attribute of
+        // a languageAlias element in 
+        // https://www.unicode.org/repos/cldr/trunk/common/supplemental/supplementalMetadata.xml
+        canonical: "he-x-private",
+    },
+    {
+        tag: "de-u-kf",
+    },
+    {
+        tag: "ces",
+        // "ces" should be canonicalized into "cs" because "ces" matches the type attribute of
+        // a languageAlias element in 
+        // https://www.unicode.org/repos/cldr/trunk/common/supplemental/supplementalMetadata.xml
+        canonical: "cs",
+    },
+    {
+        tag: "hy-arevela",
+        canonical: "hy",
+    },
+    {
+        tag: "hy-arevmda",
+        canonical: "hyw",
+    },
+];
+
+for (const {tag, canonical = tag} of testData) {
+    assert.sameValue(
+      Intl.getCanonicalLocales(tag)[0],
+      canonical,
+      'The value of Intl.getCanonicalLocales(tag)[0] equals the value of `canonical`'
+    );
+}
+
+reportCompare(0, 0);