v / vlib / datatypes
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1import datatypes as dt


2


3fn test_is_empty() {


4    mut stack := dt.Stack[int]{}


5    assert stack.is_empty() == true


6    stack.push(1)


7    assert stack.is_empty() == false


8}


9


10fn test_len() {


11    mut stack := dt.Stack[int]{}


12    assert stack.len() == 0


13    stack.push(1)


14    assert stack.len() == 1


15    stack.pop()!


16    assert stack.len() == 0


17}


18


19fn test_peek() {


20    mut stack := dt.Stack[int]{}


21    stack.push(1)


22    assert stack.peek()! == 1


23    stack.push(2)


24    assert stack.peek()! == 2


25    stack = dt.Stack[int]{}


26    stack.peek() or { return }


27    assert false


28}


29


30fn test_push() {


31    mut stack := dt.Stack[int]{}


32    stack.push(1)


33    assert stack.peek()! == 1


34    stack.push(2)


35    assert stack.peek()! == 2


36    stack.push(3)


37    assert stack.peek()! == 3


38}


39


40fn test_pop() {


41    mut stack := dt.Stack[int]{}


42    stack.push(1)


43    stack.push(2)


44    stack.push(3)


45    assert stack.pop()! == 3


46    stack.push(4)


47    assert stack.pop()! == 4


48    assert stack.pop()! == 2


49    stack = dt.Stack[int]{}


50    stack.pop() or { return }


51    assert false


52}


53


54fn test_array() {


55    mut stack := dt.Stack[int]{}


56    stack.push(1)


57    stack.push(2)


58    assert stack.array() == [1, 2]


59}