Arrays.fill(arrays, sharedArray);

    try {
      Floats.concat(arrays);
      fail();
    } catch (IllegalArgumentException expected) {
    }
  }

  public void testEnsureCapacity() {
    assertThat(Floats.ensureCapacity(EMPTY, 0, 1)).isSameInstanceAs(EMPTY);
    assertThat(Floats.ensureCapacity(ARRAY1, 0, 1)).isSameInstanceAs(ARRAY1);