test/jdk/java/io/PrintStream/FormatLocale.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 8146156
 * @summary test whether conversion follows Locale.Category.FORMAT locale.
 * @modules jdk.localedata
 * @run main/othervm FormatLocale
 */

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.List;
import java.util.Locale;
import java.util.Locale.Category;
import java.util.stream.IntStream;

public class FormatLocale {

    static final float src = 3.14f;
    static final List<Locale> formatLocale = List.of(Locale.US, Locale.FRANCE);
    static final List<String> expected = List.of("3.14", "3,14");

    public static void main(String [] args) {
        IntStream.range(0, formatLocale.size()).forEach(i -> {
            Locale.setDefault(Locale.Category.FORMAT, formatLocale.get(i));
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            new PrintStream(baos).format("%.2f", src);
            if (!baos.toString().equals(expected.get(i))) {
                throw new RuntimeException(
                    "Wrong conversion with PrintStream.format() in locale "
                    + formatLocale.get(i) +
                    ". Expected: " + expected.get(i) +
                    " Returned: " + baos.toString());
            }
        });
    }
}