assertThat(expected).hasMessageThat().contains("1, 2");
  }

  public void testOnlyElementMany() {
    IllegalArgumentException expected =
        assertThrows(
            IllegalArgumentException.class,
            () -> Stream.of(1, 2, 3, 4, 5, 6).collect(onlyElement()));
    assertThat(expected).hasMessageThat().contains("1, 2, 3, 4, 5, ...");
  }

      assertThat(e).hasMessageThat().isEqualTo("Cannot get() on a pending future.");
    }
  }

  static void verifyTimedGetOnPendingFuture(Future<?> future) {
    try {
      future.get(0, SECONDS);
      fail();
    } catch (Exception e) {
      assertThat(e).isInstanceOf(IllegalStateException.class);
      assertThat(e).hasMessageThat().isEqualTo("Cannot get() on a pending future.");
    }
  }

    equivalenceMock.replay();

    try {
      tester.addEquivalenceGroup(group1Item1, group1Item2).test();
    } catch (AssertionFailedError expected) {
      assertThat(expected)
          .hasMessageThat()
          .contains(
              "TestObject{group=1, item=2} [group 1, item 2] must be equivalent to "
                  + "TestObject{group=1, item=1} [group 1, item 1]");
      return;
    }
    fail();

    equivalenceMock.replay();

    try {
      tester.addEquivalenceGroup(group1Item1, group1Item2).test();
    } catch (AssertionFailedError expected) {
      assertThat(expected)
          .hasMessageThat()
          .contains(
              "TestObject{group=1, item=2} [group 1, item 2] must be equivalent to "
                  + "TestObject{group=1, item=1} [group 1, item 1]");
      return;
    }
    fail();

    // b/38490623: The string contains "1.0" under most environment but just "1" under J2CL.
    assertThat(expected).hasMessageThat().contains("1");
    assertThat(expected).hasMessageThat().contains("UP");
  }

  public void testCheckNoOverflow_success() {
    MathPreconditions.checkNoOverflow(true, "testCheckNoOverflow_success", 0, 0);
  }

    verify(true, "message");
  }

  public void testVerify_simpleMessage_failure() {
    VerifyException expected = assertThrows(VerifyException.class, () -> verify(false, "message"));
    assertThat(expected).hasMessageThat().isEqualTo("message");
  }

  public void testVerify_complexMessage_success() {
    verify(true, "%s", IGNORE_ME);
  }

  public void testVerify_complexMessage_failure() {

    assertThat(expected).hasMessageThat().isEqualTo("Mark not set");
  }

  public void testMarkNotSupported() {
    counter = new CountingInputStream(new UnmarkableInputStream());

    IOException expected = assertThrows(IOException.class, () -> counter.reset());
    assertThat(expected).hasMessageThat().isEqualTo("Mark not supported");
  }

    // b/38490623: The string contains "1.0" under most environment but just "1" under J2CL.
    assertThat(expected).hasMessageThat().contains("1");
    assertThat(expected).hasMessageThat().contains("UP");
  }

  public void testCheckNoOverflow_success() {
    MathPreconditions.checkNoOverflow(true, "testCheckNoOverflow_success", 0, 0);
  }

    try {
      stack.runTearDown();
      fail("runTearDown should have thrown an exception");
    } catch (RuntimeException expected) {
      assertThat(expected).hasMessageThat().isEqualTo("two");
      assertThat(getOnlyElement(asList(expected.getSuppressed())))
          .hasMessageThat()
          .isEqualTo("one");
    }

    assertEquals(true, tearDownOne.ran);
    assertEquals(true, tearDownTwo.ran);
  }

  @Override

  public void testGetResource_notFound() {
    IllegalArgumentException e =
        assertThrows(
            IllegalArgumentException.class, () -> Resources.getResource("no such resource"));
    assertThat(e).hasMessageThat().isEqualTo("resource no such resource not found.");
  }

  public void testGetResource() {
    assertThat(Resources.getResource("com/google/common/io/testdata/i18n.txt")).isNotNull();
  }