assertThat(dim1 * dim2).isAtLeast(0);
    testConcatOverflow(dim1, dim2);
  }

  private static void testConcatOverflow(int arraysDim1, int arraysDim2) {
    assertThat((long) arraysDim1 * arraysDim2).isNotEqualTo((long) (arraysDim1 * arraysDim2));

    int[][] arrays = new int[arraysDim1][];
    // it's shared to avoid using too much memory in tests
    int[] sharedArray = new int[arraysDim2];

    assertThat(dim1 * dim2).isAtLeast(0);
    testConcatOverflow(dim1, dim2);
  }

  private static void testConcatOverflow(int arraysDim1, int arraysDim2) {
    assertThat((long) arraysDim1 * arraysDim2).isNotEqualTo((long) (arraysDim1 * arraysDim2));

    float[][] arrays = new float[arraysDim1][];
    // it's shared to avoid using too much memory in tests
    float[] sharedArray = new float[arraysDim2];

    assertThat(result.size()).isGreaterThan(2);
    assertThat(result.get("test")).isEqualTo("");
    assertThat(result.get("java.version")).isEqualTo("hidden");
    assertThat(result.get("java.version")).isNotEqualTo(System.getProperty("java.version"));
  }

  @J2ktIncompatible
  @GwtIncompatible // Maps.fromProperties
  public void testFromPropertiesNullKey() {
    Properties properties =

    TypeToken<?> matrixType =
        type.resolveType(Holder.class.getDeclaredField("matrix").getGenericType());
    assertEquals(List[].class, matrixType.getRawType());
    assertThat(matrixType.getType()).isNotEqualTo(new TypeToken<List<?>[]>() {}.getType());
  }

  public void testWildcardCaptured_wildcardWithImplicitBound() throws Exception {
    TypeToken<Holder<?>> type = new TypeToken<Holder<?>>() {};

    TypeToken<?> matrixType =
        type.resolveType(Holder.class.getDeclaredField("matrix").getGenericType());
    assertEquals(List[].class, matrixType.getRawType());
    assertThat(matrixType.getType()).isNotEqualTo(new TypeToken<List<?>[]>() {}.getType());
  }

  public void testWildcardCaptured_wildcardWithImplicitBound() throws Exception {
    TypeToken<Holder<?>> type = new TypeToken<Holder<?>>() {};