svoid test_differentByEpsilonRatio() {
  assertFalseVerbose(differentByEpsilonRatio(0, 0, 0.001));
  assertTrueVerbose(differentByEpsilonRatio(0, 1, 0.001));
  assertTrueVerbose(differentByEpsilonRatio(-1, 1, 0.001));
  assertTrueVerbose(differentByEpsilonRatio(-1, -1.1, 0.001));
  assertFalseVerbose(differentByEpsilonRatio(-1, -1.01, 0.1));
}