@Test
public void popEmptyStackExceptionAfterMultiplePushPop() {
stack.push(100);
stack.push(200);
stack.push(300);
assertEquals(3, stack.size());
assertEquals(300, stack.pop());
assertEquals(2, stack.size());
assertEquals(200, stack.pop());
assertEquals(1, stack.size());
assertEquals(100, stack.pop());
assertEquals(0, stack.size());
stack.push(999);
assertEquals(1, stack.size());
assertEquals(999, stack.pop());
ex.expect(StackEmptyException.class);
stack.pop();
}
@Test
public void pushPopOneElement() {
stack.push(100);
assertEquals(1, stack.size());
assertEquals(100, stack.pop());
assertEquals(0, stack.size());
}
@Test
public void pushPopTwoElements() {
stack.push(100);
stack.push(200);
assertEquals(2, stack.size());
assertEquals(200, stack.pop());
assertEquals(1, stack.size());
assertEquals(100, stack.pop());
}
@Test
public void pushPopElementsMultipleTimes() {
stack.push(300);
stack.push(400);
stack.push(500);
stack.push(600);
stack.push(700);
assertEquals(5, stack.size());
assertEquals(700, stack.pop());
assertEquals(4, stack.size());
assertEquals(600, stack.pop());
assertEquals(3, stack.size());
assertEquals(500, stack.pop());
assertEquals(2, stack.size());
assertEquals(400, stack.pop());
assertEquals(1, stack.size());
assertEquals(300, stack.pop());
assertEquals(0, stack.size());
stack.push(99);
assertEquals(1, stack.size());
assertEquals(99, stack.pop());
assertEquals(0, stack.size());
}
@Test
public void sizeAfterTwoElementsAdded() {
stack.push(100);
stack.push(200);
assertEquals(2, stack.size());
}
@Test
public void sizeAfterOneElementAdded() {
stack.push(100);
assertEquals(1, stack.size());
}
@Test
public void sizeWhenNoElementAdded() {
assertEquals(0, stack.size());
}
