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diff --git a/js/src/tests/non262/Intl/unicode-bcp47-locale-ids-region-mappings.js b/js/src/tests/non262/Intl/unicode-bcp47-locale-ids-region-mappings.js
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+++ b/js/src/tests/non262/Intl/unicode-bcp47-locale-ids-region-mappings.js
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+// |reftest| skip-if(!this.hasOwnProperty("Intl"))
+
+// For the most part the mappings from IANA are a subset of the CLDR mappings.
+// So there are mappings which are consistent across both databases.
+assertEq(Intl.getCanonicalLocales("de-DD")[0], "de-DE");
+
+// CLDR contains additional mappings:
+// <territoryAlias type="QU" replacement="EU" reason="deprecated"/>
+// <territoryAlias type="UK" replacement="GB" reason="deprecated"/>
+assertEq(Intl.getCanonicalLocales("und-QU")[0], "und-EU");
+assertEq(Intl.getCanonicalLocales("en-UK")[0], "en-GB");
+
+// CLDR additional maps ISO 3166-1 numeric to ISO 3166-1 alpha-2 codes:
+// <territoryAlias type="280" replacement="DE" reason="deprecated"/>
+// <territoryAlias type="278" replacement="DE" reason="overlong"/>
+// <territoryAlias type="276" replacement="DE" reason="overlong"/>
+assertEq(Intl.getCanonicalLocales("de-280")[0], "de-DE");
+assertEq(Intl.getCanonicalLocales("de-278")[0], "de-DE");
+assertEq(Intl.getCanonicalLocales("de-276")[0], "de-DE");
+
+if (typeof reportCompare === "function")
+ reportCompare(true, true);