jdk/test/jdk/java/net/httpclient/HttpRequestBodyPublishers/FromPublisherTest.java

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import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.ValueSource;

import java.net.http.HttpRequest;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;

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

/*
 * @test
 * @bug 8364733
 * @summary Verify all specified `HttpRequest.BodyPublishers::fromPublisher` behavior
 * @build RecordingSubscriber
 * @run junit FromPublisherTest
 */

class FromPublisherTest {

    @Test
    void testNullPublisher() {
        assertThrows(NullPointerException.class, () -> HttpRequest.BodyPublishers.fromPublisher(null));
        assertThrows(NullPointerException.class, () -> HttpRequest.BodyPublishers.fromPublisher(null, 1));
    }

    @ParameterizedTest
    @ValueSource(longs = {0L, -1L, Long.MIN_VALUE})
    void testInvalidContentLength(long contentLength) {
        IllegalArgumentException exception = assertThrows(
                IllegalArgumentException.class,
                () -> HttpRequest.BodyPublishers.fromPublisher(null, contentLength));
        String exceptionMessage = exception.getMessage();
        assertTrue(
                exceptionMessage.contains("non-positive contentLength"),
                "Unexpected exception message: " + exceptionMessage);
    }

    @ParameterizedTest
    @ValueSource(longs = {1, 2, 3, 4})
    void testValidContentLength(long contentLength) {
        HttpRequest.BodyPublisher publisher =
                HttpRequest.BodyPublishers.fromPublisher(HttpRequest.BodyPublishers.noBody(), contentLength);
        assertEquals(contentLength, publisher.contentLength());
    }

    @Test
    void testNoContentLength() {
        HttpRequest.BodyPublisher publisher =
                HttpRequest.BodyPublishers.fromPublisher(HttpRequest.BodyPublishers.noBody());
        assertEquals(-1, publisher.contentLength());
    }

    @Test
    void testNullSubscriber() {
        HttpRequest.BodyPublisher publisher =
                HttpRequest.BodyPublishers.fromPublisher(HttpRequest.BodyPublishers.noBody());
        assertThrows(NullPointerException.class, () -> publisher.subscribe(null));
    }

    @Test
    void testDelegation() throws InterruptedException {
        BlockingQueue<Object> publisherInvocations = new LinkedBlockingQueue<>();
        HttpRequest.BodyPublisher publisher = HttpRequest.BodyPublishers.fromPublisher(subscriber -> {
            publisherInvocations.add("subscribe");
            publisherInvocations.add(subscriber);
        });
        RecordingSubscriber subscriber = new RecordingSubscriber();
        publisher.subscribe(subscriber);
        assertEquals("subscribe", publisherInvocations.take());
        assertEquals(subscriber, publisherInvocations.take());
        assertTrue(subscriber.invocations.isEmpty());
    }

}