() -> networkAsMutableNetwork.addEdge(N1, N2, EDGE_NOT_IN_GRAPH));
    assertThat(e).hasMessageThat().contains(ERROR_PARALLEL_EDGE);
    e =
        assertThrows(
            IllegalArgumentException.class,
            () -> networkAsMutableNetwork.addEdge(N2, N1, EDGE_NOT_IN_GRAPH));
    assertThat(e).hasMessageThat().contains(ERROR_PARALLEL_EDGE);
  }

  @Test

            () -> graph.edgeValueOrDefault(EndpointPair.unordered(1, 2), "default"));
    assertThat(e).hasMessageThat().contains(ENDPOINTS_MISMATCH);
    e =
        assertThrows(
            IllegalArgumentException.class,
            () -> graph.edgeValueOrDefault(EndpointPair.unordered(2, 1), "default"));
    assertThat(e).hasMessageThat().contains(ENDPOINTS_MISMATCH);
  }

  @Test

        assertThrows(
            ArithmeticException.class,
            () -> MathPreconditions.checkInRangeForRoundingInputs(false, 1.0, RoundingMode.UP));
    assertThat(expected).hasMessageThat().contains("1.0");
    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() {

    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

        assertThrows(IllegalArgumentException.class, () -> range.intersection(Range.open(3, 5)));
    assertThat(expected).hasMessageThat().contains("connected");
    expected =
        assertThrows(IllegalArgumentException.class, () -> range.intersection(Range.closed(0, 2)));
    assertThat(expected).hasMessageThat().contains("connected");
  }

  public void testIntersection_deFactoEmpty() {
    {

    IllegalArgumentException expected =
        assertThrows(IllegalArgumentException.class, () -> new PercentEscaper("-+#abc.!", false));
    assertThat(expected).hasMessageThat().isEqualTo(msg);
  }

  public void testBadArguments_plusforspace() {
    // space can be a safe char if plusForSpace is false
    PercentEscaper unused = new PercentEscaper(" ", false);

      assertThat(expected).hasMessageThat().contains("create(null)");
      return;
    }
    fail("should have failed");
  }

  public void testBadEquals_withParameterizedType() throws Exception {
    try {
      tester.testEquals(BadEqualsWithParameterizedType.class);
    } catch (AssertionError expected) {
      assertThat(expected).hasMessageThat().contains("create([[1]])");
      return;
    }

        assertThrows(IllegalArgumentException.class, () -> directedGraph.addEdge(N1, N2, E12_A));
    assertThat(e).hasMessageThat().contains(ERROR_PARALLEL_EDGE);

    // By default, self-loop edges are not allowed.
    e = assertThrows(IllegalArgumentException.class, () -> directedGraph.addEdge(N1, N1, E11));
    assertThat(e).hasMessageThat().contains(ERROR_SELF_LOOP);
  }

  @Test
  public void createUndirected() {

    assertFalse(future.isCancelled());

    try {
      future.get();
      fail("Future should rethrow the exception.");
    } catch (ExecutionException e) {
      assertThat(e).hasCauseThat().hasMessageThat().isEqualTo(message);
    }
  }