// This test is slow (~6s) due to math utils using an inferior algorithm to calculate the result.
  @Test
  public void doubleScalarMultiplyVariableTimeReturnsExpectedResult() {
    for (int i = 0; i < 50; i++) {
      // Arrange:
      final GroupElement basePoint = ed25519.getB();
      final GroupElement g = MathUtils.getRandomGroupElement();
      g.precompute(false);
      final FieldElement f1 = MathUtils.getRandomFieldElement();
      final FieldElement f2 = MathUtils.getRandomFieldElement();

      // Act:
      final GroupElement h1 =
          basePoint.doubleScalarMultiplyVariableTime(g, f2.toByteArray(), f1.toByteArray());
      final GroupElement h2 = MathUtils.doubleScalarMultiplyGroupElements(basePoint, f1, g, f2);

      // Assert:
      Assert.assertThat(h1, IsEqual.equalTo(h2));
    }
  }
  // This test is slow (~6s) due to math utils using an inferior algorithm to calculate the result.
  @Test
  public void scalarMultiplyBasePointReturnsExpectedResult() {
    for (int i = 0; i < 100; i++) {
      // Arrange:
      final GroupElement basePoint = ed25519.getB();
      final FieldElement f = MathUtils.getRandomFieldElement();

      // Act:
      final GroupElement g = basePoint.scalarMultiply(f.toByteArray());
      final GroupElement h = MathUtils.scalarMultiplyGroupElement(basePoint, f);

      // Assert:
      Assert.assertThat(g, IsEqual.equalTo(h));
    }
  }