core/src/test/java/io/grpc/AttributesTest.java

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package io.grpc;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertSame;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Unit tests for {@link Attributes}. */
@RunWith(JUnit4.class)
public class AttributesTest {
  private static Attributes.Key<String> YOLO_KEY = Attributes.Key.of("yolo");

  @Test
  public void buildAttributes() {
    Attributes attrs = Attributes.newBuilder().set(YOLO_KEY, "To be, or not to be?").build();
    assertSame("To be, or not to be?", attrs.get(YOLO_KEY));
    assertEquals(1, attrs.keys().size());
  }

  @Test
  public void duplicates() {
    Attributes attrs = Attributes.newBuilder()
            .set(YOLO_KEY, "To be?")
            .set(YOLO_KEY, "Or not to be?")
            .set(Attributes.Key.of("yolo"), "I'm not a duplicate")
            .build();
    assertSame("Or not to be?", attrs.get(YOLO_KEY));
    assertEquals(2, attrs.keys().size());
  }

  @Test
  public void empty() {
    assertEquals(0, Attributes.EMPTY.keys().size());
  }
}