/** Test method for popping negative index. */
@Test(expected = ArrayIndexOutOfBoundsException.class)
public void testPopNegativeIndex() {
pushElements();
my_stack.pop();
my_stack.pop();
my_stack.pop();
}
/** Test method for Push. */
@Test
public void testPush() {
pushElements();
// test size was incremented correctly after two pushes; size should be 2
assertTrue("push() failed to increment size", my_stack.size() == 2);
// test top was incremented correctly after two pushes; top should be 1
assertTrue("push() failed to increment top", my_stack.size() - 1 == 1);
final String return_value1 = my_stack.pop();
// test if top element is in correct position; element should be "World"
assertTrue("push() failed to put element in correctly!", "World".equals(return_value1));
final String return_value2 = my_stack.pop();
// test if the last element is in correct position; element should be "Hello"
assertTrue("push() failed to put element in correctly!", "Hello".equals(return_value2));
}
/** Test method for Pop. */
@Test
public void testPop() {
pushElements();
final String return_value = my_stack.pop();
// test if the right element is returned; popped element should be "World"
assertTrue("pop() returned the wrong element!", "World".equals(return_value));
// test size was decremented; size should be 1
assertTrue("pop() didn't decrement size correctly!", my_stack.size() == 1);
// test top was decremented; top should be 0
assertTrue("pop() didn't decrement top correctly!", my_stack.size() - 1 == 0);
}
/** Test method for isEmpty. */
@Test
public void testIsEmpty() {
// test if the new stack is empty; boolean should be true
assertTrue("isEmpty() failed to return true", my_stack.isEmpty());
pushElements();
// test if the stack is not empty; boolean should be false
assertFalse("isEmpty() failed to return false", my_stack.isEmpty());
my_stack.pop();
my_stack.pop();
// test if elements were pushed and popped from stack
// that the stack is empty; boolean should be true
assertTrue("isEmpty() failed to return true", my_stack.isEmpty());
}