import static org.mockito.ArgumentMatchers.any;
import static org.mockito.ArgumentMatchers.anyInt;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.ArgumentMatchers.isNull;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.DisplayName;

    BiMap<Integer, Integer> bimap = HashBiMap.create(N);
    BiMap<Integer, Integer> inverse = bimap.inverse();

    for (int i = 0; i < N; i++) {
      assertThat(bimap.put(2 * i, 2 * i + 1)).isNull();
    }
    for (int i = 0; i < N; i++) {
      assertEquals(2 * i + 1, (int) bimap.get(2 * i));
    }
    for (int i = 0; i < N; i++) {
      assertEquals(2 * i, (int) inverse.get(2 * i + 1));
    }

    assertEquals(bimap1, bimap2);
    bimap2.inverse().put(Country.SWITZERLAND, Currency.FRANC);
    assertEquals(Country.SWITZERLAND, bimap2.get(Currency.FRANC));
    assertThat(bimap1.get(Currency.FRANC)).isNull();
    assertFalse(bimap2.equals(bimap1));

    /* Test that it can be empty. */
    EnumBiMap<Currency, Country> emptyBimap = EnumBiMap.create(Currency.class, Country.class);

    underlying.put("a", 1);
    Map<String, String> map = transformValues(underlying, Functions.toStringFunction());
    assertThat(map.remove("a")).isEqualTo("1");
    assertThat(map.remove("b")).isNull();
  }

  public void testTransformEqualityOfMapsWithNullValues() {
    Map<String, @Nullable String> underlying = new HashMap<>();
    underlying.put("a", null);
    underlying.put("b", "");

    underlying.put("a", 1);
    Map<String, String> map = transformValues(underlying, Functions.toStringFunction());
    assertThat(map.remove("a")).isEqualTo("1");
    assertThat(map.remove("b")).isNull();
  }

  public void testTransformEqualityOfMapsWithNullValues() {
    Map<String, @Nullable String> underlying = new HashMap<>();
    underlying.put("a", null);
    underlying.put("b", "");

  }

  public void testGetOnlyElement_withDefault_empty_null() {
    Iterator<String> iterator = emptyIterator();
    assertThat(Iterators.<@Nullable String>getOnlyElement(iterator, null)).isNull();
  }

  public void testGetOnlyElement_withDefault_two() {
    Iterator<String> iterator = asList("foo", "bar").iterator();
    IllegalArgumentException expected =

      }
    } catch (Throwable caught) {
      assertThat(caught).isInstanceOf(IOException.class);
    }

    assertTrue(c1.isClosed());
    assertTrue(c2.isClosed());
    assertThat(c3).isNull();

    assertTrue(suppressor.suppressions.isEmpty());
  }

  public void testExceptionThrown_whileClosingLastCloseable() throws IOException {
    Closer closer = new Closer(suppressor);

  @Override
  protected final void tearDown() {
    tearDownStack.runTearDown();
    assertWithMessage("exceptions should not be propagated to uncaught exception handlers")
        .that(thrownByExecutionThread)
        .isNull();
  }

  public void testServiceStartStop() throws Exception {
    WaitOnRunService service = new WaitOnRunService();
    assertFalse(service.startUpCalled);

    service.startAsync().awaitRunning();

  }

  public void testGetOnlyElement_withDefault_empty_null() {
    Iterator<String> iterator = emptyIterator();
    assertThat(Iterators.<@Nullable String>getOnlyElement(iterator, null)).isNull();
  }

  public void testGetOnlyElement_withDefault_two() {
    Iterator<String> iterator = asList("foo", "bar").iterator();
    IllegalArgumentException expected =

      assertThat(urls.get(0).getAuthority()).isNull();
      assertThat(urls.get(0).getPath()).endsWith("/relative/path/to/some.jar");

      assertThat(urls.get(1)).isEqualTo(new URL("file:///absolute/path/to/some.jar"));

      assertThat(urls.get(2).getProtocol()).isEqualTo("file");
      assertThat(urls.get(2).getAuthority()).isNull();