test/jdk/java/text/Format/DecimalFormat/ToLocalizedPatternTest.java

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/*
 * @test
 * @bug 8282929 8326908
 * @summary Verify DecimalFormat::toLocalizedPattern correctness.
 * @run junit ToLocalizedPatternTest
 */

import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.Locale;

public class ToLocalizedPatternTest {
    private static final char MONETARY_GROUPING = 'g';
    private static final char MONETARY_DECIMAL = 'd';

    // Verifies that the toLocalizedPattern() method correctly returns
    // monetary symbols for a currency formatter.
    @Test
    public void monetarySymbolsTest() {
        var dfs = new DecimalFormatSymbols(Locale.US);

        // Customize the decimal format symbols
        dfs.setMonetaryGroupingSeparator(MONETARY_GROUPING);
        dfs.setMonetaryDecimalSeparator(MONETARY_DECIMAL);

        // create a currency formatter
        var cf = (DecimalFormat)DecimalFormat.getCurrencyInstance(Locale.US);
        cf.setDecimalFormatSymbols(dfs);

        // check
        assertEquals(cf.toLocalizedPattern(),
            cf.toPattern()
               .replace(',', MONETARY_GROUPING)
               .replace('.', MONETARY_DECIMAL));
    }

    // Verify some common symbols are enforced with the DFS
    @Test
    public void useDFSWhenLocalizedTest() {
        DecimalFormatSymbols dfs = new DecimalFormatSymbols();
        dfs.setGroupingSeparator('a');
        dfs.setDecimalSeparator('b');
        dfs.setDigit('c');
        dfs.setZeroDigit('d');
        // Create a DecimalFormat that utilizes the above symbols
        DecimalFormat dFmt = new DecimalFormat("###,##0.###", dfs);
        assertEquals("caccdbccc", dFmt.toLocalizedPattern());
    }
}