&& StrictMath.pow(2.0, DoubleMath.log2(x, FLOOR)) == x;
      assertEquals(expected, DoubleMath.isPowerOfTwo(x));
    }
  }

  @GwtIncompatible // #trueLog2, Math.ulp
  public void testLog2Accuracy() {
    for (double d : POSITIVE_FINITE_DOUBLE_CANDIDATES) {
      double dmLog2 = DoubleMath.log2(d);
      double trueLog2 = trueLog2(d);
      assertTrue(Math.abs(dmLog2 - trueLog2) <= Math.ulp(trueLog2));
    }

              && StrictMath.pow(2.0, DoubleMath.log2(x, FLOOR)) == x;
      assertEquals(expected, DoubleMath.isPowerOfTwo(x));
    }
  }

  @GwtIncompatible // #trueLog2, Math.ulp
  public void testLog2Accuracy() {
    for (double d : POSITIVE_FINITE_DOUBLE_CANDIDATES) {
      double dmLog2 = DoubleMath.log2(d);
      double trueLog2 = trueLog2(d);
      assertTrue(Math.abs(dmLog2 - trueLog2) <= Math.ulp(trueLog2));
    }