@Test
public void divisionByZeroShouldGiveInfinity() {
ExpressionResolver resolver = new ExpressionResolver();
ExpressionResolver spy = spy(resolver);
Double result = spy.solveSimpleTerm(new Double(1), new Double(0), "DIV");
assertEquals(result, new Double(POSITIVE_INFINITY));
}
@Test
public void multiplicationIfNegativesShouldBeCorrect() {
ExpressionResolver resolver = new ExpressionResolver();
ExpressionResolver spy = spy(resolver);
Double result = spy.solveSimpleTerm(new Double(1), new Double(-2), "MUL");
assertEquals(result, new Double(-2));
}
@Test
public void divisionOfNegativesShouldBeCorrect() {
ExpressionResolver resolver = new ExpressionResolver();
ExpressionResolver spy = spy(resolver);
Double result = spy.solveSimpleTerm(new Double(-1), new Double(2), "DIV");
assertEquals(result, new Double(-0.5));
}