test/jdk/java/text/Format/NumberFormat/StrictMethodsTest.java

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/*
 * @test
 * @bug 8327640
 * @summary Unit test for the isStrict() and setStrict() parsing related methods
 * @run junit StrictMethodsTest
 */

import org.junit.jupiter.api.Test;

import java.text.CompactNumberFormat;
import java.text.DecimalFormat;
import java.text.FieldPosition;
import java.text.NumberFormat;
import java.text.ParsePosition;

import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

public class StrictMethodsTest {

    // Check that DecimalFormat implements isStrict()/setStrict()
    // Ensure that the default value is false, and can be set to true via API
    @Test
    public void decimalFormatTest() {
        DecimalFormat dFmt = (DecimalFormat) NumberFormat.getInstance();
        assertFalse(dFmt.isStrict());
        dFmt.setStrict(true);
        assertTrue(dFmt.isStrict());
    }

    // Check that CompactNumberFormat implements isStrict()/setStrict()
    // Ensure that the default value is false, and can be set to true via API
    @Test
    public void compactFormatTest() {
        CompactNumberFormat cFmt = (CompactNumberFormat) NumberFormat.getCompactNumberInstance();
        assertFalse(cFmt.isStrict());
        cFmt.setStrict(true);
        assertTrue(cFmt.isStrict());
    }

    // Check that NumberFormat throws exception for isStrict()/setStrict()
    // when subclass does not implement said methods
    @Test
    public void numberFormatTest() {
        FooFormat fmt = new FooFormat();
        assertThrows(UnsupportedOperationException.class, fmt::isStrict);
        assertThrows(UnsupportedOperationException.class, () -> fmt.setStrict(false));
    }

    // Dummy NumberFormat class to check that isStrict() and setStrict()
    // are not implemented by default
    private static class FooFormat extends NumberFormat {

        // Provide overrides for abstract methods
        @Override
        public StringBuffer format(double number, StringBuffer toAppendTo, FieldPosition pos) {
            return null;
        }

        @Override
        public StringBuffer format(long number, StringBuffer toAppendTo, FieldPosition pos) {
            return null;
        }

        @Override
        public Number parse(String source, ParsePosition parsePosition) {
            return null;
        }
    }
}