@Test
public void testMyStack() {
// Test expected results of creating a new MyStack object
MyStack<Integer> testStack = new MyStack<Integer>();
assertTrue(testStack.size() == 0);
assertTrue(testStack.isEmpty());
}
@Test
public void canPushAndPeekTag() {
MyStack testStack = new MyStack();
HtmlTag testTag = new HtmlTag("b");
testStack.push(testTag);
assertEquals(testStack.peek().getElement(), testTag.getElement());
}
@Test
public void canPushAndPopTag() {
MyStack testStack = new MyStack();
HtmlTag testTag = new HtmlTag("html");
testStack.push(testTag);
assertEquals(testStack.pop().getElement(), testTag.getElement());
assertTrue(testStack.isEmpty());
}
@Test
public void pushShouldAddToEmptyStack() {
MyStack testStack = new MyStack();
HtmlTag testTag = new HtmlTag("html");
assertTrue(testStack.isEmpty());
testStack.push(testTag);
assertFalse(testStack.isEmpty());
}
@Test
public void testIsEmpty() {
MyStack<Integer> test = new MyStack<Integer>();
test.push(2);
test.push(230);
test.pop();
test.pop();
assertTrue(test.isEmpty());
}
@Test
public void testPeek() {
MyStack<Integer> testStack = new MyStack<Integer>();
testStack.push(23);
assertTrue(testStack.peek() == 23);
// Ensure the next pushed item is on top
testStack.push(2);
assertTrue(testStack.peek() == 2);
}
@Test
public void testPush() {
MyStack<Integer> testStack = new MyStack<Integer>();
testStack.push(23);
testStack.push(43);
testStack.push(21);
// Ensure the correct size after doing a number of pushes
assertFalse(testStack.isEmpty());
assertTrue(testStack.size() == 3);
}
@Test
public void testClear() {
MyStack<Integer> testStack = new MyStack<Integer>();
testStack.push(23);
testStack.push(2039);
testStack.push(220);
assertTrue(testStack.size() == 3);
// Ensure quality of the clear method.
testStack.clear();
assertTrue(testStack.size() == 0);
assertTrue(testStack.isEmpty());
}
@Test
public void testPop() {
MyStack<String> testStack = new MyStack<String>();
testStack.push("hello");
testStack.push("dog");
testStack.push("cat");
assertEquals("cat", testStack.pop());
assertTrue(testStack.size() == 2);
// Ensure the popped object is gone
assertEquals("dog", testStack.peek());
}
@Test
public void canCreateEmptyMyStack() {
MyStack testStack = new MyStack();
assertTrue(testStack.isEmpty());
}
// Testing Stack
@Test
public void testStack() {
MyStack<Integer> testStack = new MyStack<Integer>();
testStack.push(5);
testStack.push(2);
testStack.push(3);
assertEquals(3, testStack.size());
assertEquals(3, testStack.peek(), 0);
testStack.pop();
assertEquals(2, testStack.size());
assertEquals(2, testStack.peek(), 0);
testStack.pop();
assertEquals(1, testStack.size());
assertEquals(5, testStack.peek(), 0);
testStack.pop();
assertEquals(0, testStack.size());
}
@Test(expected = NoSuchElementException.class)
public void testPopFail() {
MyStack<Integer> testStack = new MyStack<Integer>();
testStack.pop();
}
@Test(expected = NoSuchElementException.class)
public void testPeekFail() {
// Ensure the thrown exception of peeking at an empty stack.
MyStack<Integer> testStack = new MyStack<Integer>();
testStack.peek();
}