@Test
public void afterEvaluateCallSizeShouldBe0() {
Stack.addToStack(2, '+');
Stack.addToStack(2, '/');
Stack.addToStack(5, '-');
Stack.evaluate(0);
assertThat(Stack.size(), equalTo(0));
}
@Test
public void evaluateTest() {
Stack.addToStack(2, '+');
Stack.addToStack(2, '/');
Stack.addToStack(5, '-');
Stack.addToStack(5, '*');
Stack.addToStack(1, '+');
// 0 + 2 / 2 - 5 * 5 + 1 = -23
assertThat(Stack.evaluate(0), equalTo(-23.0));
}
@Test
public void addToStackShouldIncreaseSize() {
Stack.addToStack(2, '-');
int size = Stack.size();
assertThat(size, is(1));
}
@Test(expected = UnsupportedOperationException.class)
public void addToStackTheWrongOperandShouldThrowException() {
Stack.addToStack(2, '&');
}
