@Test
public void geometricMeanTwoNegativeOperandsExpression() {
double result = Calculator.getResult(-2, -8, Calculator.OPERATOR.GEOMETRIC_MEAN);
Assert.assertTrue(Double.isNaN(result));
}
@Test
public void minusExpression() {
double result = Calculator.getResult(2, 2, Calculator.OPERATOR.MINUS);
Assert.assertEquals(0.0, result, 0.0);
}