Backporting TimezoneICUJDKCompat test.

Author: iamstolis

graal-js/src/com.oracle.truffle.js.test/src/com/oracle/truffle/js/test/runtime/TimezoneICUJDKCompat.java

@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2021, 2022, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * The Universal Permissive License (UPL), Version 1.0
+ *
+ * Subject to the condition set forth below, permission is hereby granted to any
+ * person obtaining a copy of this software, associated documentation and/or
+ * data (collectively the "Software"), free of charge and under any and all
+ * copyright rights in the Software, and any and all patent rights owned or
+ * freely licensable by each licensor hereunder covering either (i) the
+ * unmodified Software as contributed to or provided by such licensor, or (ii)
+ * the Larger Works (as defined below), to deal in both
+ *
+ * (a) the Software, and
+ *
+ * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
+ * one is included with the Software each a "Larger Work" to which the Software
+ * is contributed by such licensors),
+ *
+ * without restriction, including without limitation the rights to copy, create
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+ * use, sell, offer for sale, import, export, have made, and have sold the
+ * Software and the Larger Work(s), and to sublicense the foregoing rights on
+ * either these or other terms.
+ *
+ * This license is subject to the following condition:
+ *
+ * The above copyright notice and either this complete permission notice or at a
+ * minimum a reference to the UPL must be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ * SOFTWARE.
+ */
+package com.oracle.truffle.js.test.runtime;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TimezoneICUJDKCompat {
+
+    @Test
+    public void compareICUandJDKTimezones() {
+        String[] icuIDs = com.ibm.icu.util.TimeZone.getAvailableIDs();
+        String[] jdkIDs = java.util.TimeZone.getAvailableIDs();
+        Set<String> jdkSet = new HashSet<>(Arrays.asList(jdkIDs));
+
+        String error = null;
+        long now = System.currentTimeMillis();
+        for (String entry : icuIDs) {
+            if (jdkSet.contains(entry)) {
+
+                com.ibm.icu.util.TimeZone icuTimezone = com.ibm.icu.util.TimeZone.getTimeZone(entry);
+                java.util.TimeZone jdkTimezone = java.util.TimeZone.getTimeZone(entry);
+
+                int icuOffset = icuTimezone.getOffset(now);
+                int jdkOffset = jdkTimezone.getOffset(now);
+                if (icuOffset != jdkOffset) {
+                    error = "difference in timezone offset: " + entry + " icu=" + icuOffset + " jdk=" + jdkOffset;
+                    System.err.println(error);
+                }
+
+                jdkSet.remove(entry);
+            } else {
+                System.err.println("timezone missing in JDK: " + entry);
+                // TODO we consider this a warning only
+            }
+        }
+
+        for (String entry : jdkSet) {
+            error = "missing in ICU: " + entry;
+            System.err.println(error);
+        }
+        if (error != null) {
+            Assert.fail(error);
+        }
+    }
+
+    @Test
+    public void compareICUandJDKversions() {
+        String versionJDK = java.time.zone.ZoneRulesProvider.getVersions("UTC").lastEntry().getKey();
+        String versionICU = com.ibm.icu.util.TimeZone.getTZDataVersion();
+        if ("2021a3".equals(versionICU)) {
+            // Time zone data (tzdata) version 2021e (2021-oct) except that
+            // for now ICU retains pre-1970 time zone data that has recently
+            // been removed from the TZ DB. (Reports as version "2021a3")
+            versionICU = "2021e";
+        }
+        Assert.assertEquals(versionJDK, versionICU);
+    }
+
+}