InstantiatingHttpJsonChannelProviderTest.java

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package com.google.api.gax.httpjson;

import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertEquals;

import com.google.api.gax.rpc.TransportChannelProvider;
import java.io.IOException;
import java.util.Collections;
import java.util.concurrent.Executor;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

@RunWith(JUnit4.class)
public class InstantiatingHttpJsonChannelProviderTest {

  @Test
  public void basicTest() throws IOException {
    String endpoint = "localhost:8080";
    ScheduledExecutorService executor = new ScheduledThreadPoolExecutor(1);
    executor.shutdown();

    TransportChannelProvider provider = InstantiatingHttpJsonChannelProvider.newBuilder().build();

    assertThat(provider.needsEndpoint()).isTrue();
    provider = provider.withEndpoint(endpoint);
    assertThat(provider.needsEndpoint()).isFalse();

    assertThat(provider.needsExecutor()).isTrue();
    provider = provider.withExecutor((Executor) executor);
    assertThat(provider.needsExecutor()).isFalse();

    // Added for code coverage. Remove when withExecutor(ScheduledExecutorService) is removed.
    assertThat(provider.needsExecutor()).isFalse();
    provider = provider.withExecutor(executor);
    assertThat(provider.needsExecutor()).isFalse();

    assertThat(provider.needsHeaders()).isTrue();
    provider = provider.withHeaders(Collections.<String, String>emptyMap());
    assertThat(provider.needsHeaders()).isFalse();

    assertThat(provider.acceptsPoolSize()).isFalse();
    Exception thrownException = null;
    try {
      provider.withPoolSize(1);
    } catch (Exception e) {
      thrownException = e;
    }
    assertThat(thrownException).isInstanceOf(UnsupportedOperationException.class);

    assertThat(provider.needsCredentials()).isFalse();
    thrownException = null;
    try {
      provider.withCredentials(null);
    } catch (Exception e) {
      thrownException = e;
    }
    assertThat(thrownException).isInstanceOf(UnsupportedOperationException.class);

    assertEquals(HttpJsonTransportChannel.getHttpJsonTransportName(), provider.getTransportName());
    assertThat(provider.getTransportChannel()).isInstanceOf(HttpJsonTransportChannel.class);

    // Make sure we can create channels OK.
    provider.getTransportChannel().shutdownNow();
  }
}