8260265: UTF-8 by Default

Reviewed-by: alanb, rriggs

test/jdk/java/lang/System/FileEncodingTest.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8260265
+ * @summary Test file.encoding system property
+ * @library /test/lib
+ * @build jdk.test.lib.process.*
+ * @run testng FileEncodingTest
+ */
+
+import java.nio.charset.Charset;
+import java.util.List;
+import java.util.Locale;
+
+import jdk.test.lib.process.ProcessTools;
+
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Test;
+
+public class FileEncodingTest {
+    private static final boolean IS_WINDOWS = System.getProperty("os.name").startsWith("Windows");
+
+    @DataProvider
+    public Object[][] fileEncodingToDefault() {
+        return new Object[][] {
+            {"UTF-8", "UTF-8"},
+            {"ISO-8859-1", "ISO-8859-1"},
+            {"", "UTF-8"},
+            {"dummy", "UTF-8"},
+            {"COMPAT", "<should_be_replaced>"}
+        };
+    };
+
+    @Test(dataProvider = "fileEncodingToDefault")
+    public void testFileEncodingToDefault(String fileEncoding, String expected) throws Exception {
+        if (fileEncoding.equals("COMPAT")) {
+            if (IS_WINDOWS) {
+                // Only tests on English locales
+                if (Locale.getDefault().getLanguage().equals("en")) {
+                    expected = "windows-1252";
+                } else {
+                    System.out.println("Tests only run on Windows with English locales");
+                    return;
+                }
+            } else {
+                expected = "US-ASCII";
+            }
+        }
+        var cmds = fileEncoding.isEmpty()
+                ? List.of(FileEncodingTest.class.getName(), expected)
+                : List.of("-Dfile.encoding=" + fileEncoding, FileEncodingTest.class.getName(), expected);
+        var pb = ProcessTools.createTestJvm(cmds);
+        var env = pb.environment();
+        env.put("LANG", "C");
+        env.put("LC_ALL", "C");
+        ProcessTools.executeProcess(pb)
+                .outputTo(System.out)
+                .errorTo(System.err)
+                .shouldHaveExitValue(0);
+    }
+
+    public static void main(String... args) {
+        var def = Charset.defaultCharset().name();
+        var expected = args[0];
+        System.out.println("Default Charset: " + def + ", expected: " + expected);
+        if (!def.equals(expected)) {
+            throw new RuntimeException("default charset is not the one expected.");
+        }
+    }
+}