test/jdk/java/util/zip/GZIP/BasicGZIPInputStreamTest.java

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import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.stream.Stream;
import java.util.zip.GZIPInputStream;

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.function.Executable;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;

/*
 * @test
 * @summary basic API verification tests for GZIPInputStream
 * @run junit BasicGZIPInputStreamTest
 */
public class BasicGZIPInputStreamTest {


    private static Stream<Arguments> npeFromConstructors() {
        return Stream.of(Arguments.of((Executable) () -> new GZIPInputStream(null)),
                Arguments.of((Executable) () -> new GZIPInputStream(null, 1)));
    }

    /*
     * Verifies that the GZIPInputStream constructors throw the expected NullPointerException
     */
    @ParameterizedTest
    @MethodSource("npeFromConstructors")
    public void testNPEFromConstructors(final Executable constructor) {
        Assertions.assertThrows(NullPointerException.class, constructor,
                "GZIPInputStream constructor did not throw NullPointerException");
    }

    private static Stream<Arguments> iaeFromConstructors() {
        return Stream.of(
                Arguments.of((Executable) () -> new GZIPInputStream(
                        new ByteArrayInputStream(new byte[0]), 0)),
                Arguments.of((Executable) () -> new GZIPInputStream(
                        new ByteArrayInputStream(new byte[0]), -1)),
                Arguments.of((Executable) () -> new GZIPInputStream(
                        new ByteArrayInputStream(new byte[0]), -42)));
    }

    /*
     * Verifies that the GZIPInputStream constructors throw the expected IllegalArgumentException
     */
    @ParameterizedTest
    @MethodSource("iaeFromConstructors")
    public void testIAEFromConstructors(final Executable constructor) {
        Assertions.assertThrows(IllegalArgumentException.class, constructor,
                "GZIPInputStream constructor did not throw IllegalArgumentException");
    }

    private static Stream<Arguments> ioeFromConstructors() {
        final ByteArrayInputStream notGZIPContent = new ByteArrayInputStream(new byte[0]);
        return Stream.of(
                Arguments.of((Executable) () -> new GZIPInputStream(notGZIPContent)),
                Arguments.of((Executable) () -> new GZIPInputStream(
                        notGZIPContent, 1024 /* buffer size */)));
    }

    /*
     * Verifies that the GZIPInputStream constructors throw the expected IOException
     */
    @ParameterizedTest
    @MethodSource("ioeFromConstructors")
    public void testIOEFromConstructors(final Executable constructor) {
        Assertions.assertThrows(IOException.class, constructor,
                "GZIPInputStream constructor did not throw IOException");
    }
}