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/* @test
 * @summary Unit test for forName(String, Charset)
 * @bug 8270490
 * @modules jdk.charsets
 * @run junit ForName
 */

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.stream.Stream;

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;

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

public class ForName {

    static Stream<Arguments> params() {
        return Stream.of(
                Arguments.of("UTF-8", null, StandardCharsets.UTF_8),
                Arguments.of("UTF-8", StandardCharsets.US_ASCII, StandardCharsets.UTF_8),
                Arguments.of("windows-31j", StandardCharsets.US_ASCII, Charset.forName("windows-31j")),
                Arguments.of("foo", StandardCharsets.US_ASCII, StandardCharsets.US_ASCII),
                Arguments.of("foo", null, null),
                Arguments.of("\u3042", null, null),
                Arguments.of("\u3042", StandardCharsets.UTF_8, StandardCharsets.UTF_8)
        );
    }

    static Stream<Arguments> paramsIAE() {
        return Stream.of(
                Arguments.of(null, null),
                Arguments.of(null, StandardCharsets.UTF_8)
        );
    }

    @ParameterizedTest
    @MethodSource("params")
    public void testForName_2arg(String name, Charset fallback, Charset expected) {
        var cs = Charset.forName(name, fallback);
        assertEquals(expected, cs);
    }

    @ParameterizedTest
    @MethodSource("paramsIAE")
    public void testForName_2arg_IAE(String name, Charset fallback) {
        assertThrows(IllegalArgumentException.class, () -> Charset.forName(name, fallback));
    }
}