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deps/v8/test/intl/general/getCanonicalLocales.js

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+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Ignore the first tag when checking for duplicate subtags.
+assertDoesNotThrow(() => Intl.getCanonicalLocales("foobar-foobar"));
+
+// Ignore duplicate subtags in different namespaces; eg, 'a' vs 'u'.
+assertDoesNotThrow(() => Intl.getCanonicalLocales("en-a-ca-Chinese-u-ca-Chinese"));
+// Ignore duplicate subtags in U-extension as well. Only the first count.
+// See RFC 6067 for details.
+assertDoesNotThrow(() => Intl.getCanonicalLocales("en-u-ca-gregory-ca-chinese"));
+assertEquals("en-u-ca-gregory", Intl.getCanonicalLocales("en-u-ca-gregory-ca-chinese")[0]);
+
+// Check duplicate subtags (after the first tag) are detected.
+assertThrows(() => Intl.getCanonicalLocales("en-foobar-foobar"), RangeError);
+
+// Check some common case
+assertEquals("id", Intl.getCanonicalLocales("in")[0]);
+assertEquals("he", Intl.getCanonicalLocales("iw")[0]);
+assertEquals("yi", Intl.getCanonicalLocales("ji")[0]);
+assertEquals("jv", Intl.getCanonicalLocales("jw")[0]);
+assertEquals("ro", Intl.getCanonicalLocales("mo")[0]);
+assertEquals("sr", Intl.getCanonicalLocales("scc")[0]);
+assertEquals("sr-Latn", Intl.getCanonicalLocales("sh")[0]);
+assertEquals("sr-ME", Intl.getCanonicalLocales("cnr")[0]);
+assertEquals("no", Intl.getCanonicalLocales("no")[0]);
+assertEquals("fil", Intl.getCanonicalLocales("tl")[0]);