test/jdk/java/text/Normalizer/SquareEraCharacterTest.java

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 /*
 * @test
 * @bug 8221431
 * @summary Tests decomposition of Japanese square era characters.
 * @run testng/othervm SquareEraCharacterTest
 */

import static org.testng.Assert.assertEquals;

import java.text.Normalizer;

import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

@Test
public class SquareEraCharacterTest {

    @DataProvider
    Object[][] squareEras() {
        return new Object[][] {

            // square era character, expected decomposed string
            {'\u337e',  "\u660e\u6cbb"},    // Meizi
            {'\u337d',  "\u5927\u6b63"},    // Taisho
            {'\u337c',  "\u662d\u548c"},    // Showa
            {'\u337b',  "\u5e73\u6210"},    // Heisei
            {'\u32ff',  "\u4ee4\u548c"},    // Reiwa
        };
    }

    @Test(dataProvider="squareEras")
    public void test_normalize(char squareChar, String expected) {

        assertEquals(
            Normalizer.normalize(Character.toString(squareChar), Normalizer.Form.NFKD),
            expected,
            "decomposing " + Character.getName(squareChar) + ".");
    }
}