func TestStack(t *testing.T) {
count := 1
var aStack stack.Stack
assertTrue(t, aStack.Len() == 0, "expected empty Stack", count) // 1
count++
assertTrue(t, aStack.Cap() == 0, "expected empty Stack", count) // 2
count++
assertTrue(t, aStack.IsEmpty(), "expected empty Stack", count) // 3
count++
value, err := aStack.Pop()
assertTrue(t, value == nil, "expected nil value", count) // 4
count++
assertTrue(t, err != nil, "expected error", count) // 5
count++
value1, err := aStack.Top()
assertTrue(t, value1 == nil, "expected nil value", count) // 6
count++
assertTrue(t, err != nil, "expected error", count) // 7
count++
aStack.Push(1)
aStack.Push(2)
aStack.Push("three")
assertTrue(t, aStack.Len() == 3, "expected nonempty Stack", count) // 8
count++
assertTrue(t, aStack.IsEmpty() == false, "expected nonempty Stack",
count) // 9
count++
value2, err := aStack.Pop()
assertEqualString(t, value2.(string), "three", "unexpected text",
count) // 10
count++
assertTrue(t, err == nil, "no error expected", count) // 11
count++
value3, err := aStack.Top()
assertTrue(t, value3 == 2, "unexpected number", count) // 12
count++
assertTrue(t, err == nil, "no error expected", count) // 13
count++
aStack.Pop()
assertTrue(t, aStack.Len() == 1, "expected nonempty Stack", count) //14
count++
assertTrue(t, aStack.IsEmpty() == false, "expected nonempty Stack",
count) // 15
count++
value4, err := aStack.Pop()
assertTrue(t, value4 == 1, "unexpected number", count) // 16
count++
assertTrue(t, err == nil, "no error expected", count) // 17
count++
assertTrue(t, aStack.Len() == 0, "expected empty Stack", count) // 18
count++
assertTrue(t, aStack.IsEmpty(), "expected empty Stack", count) // 19
count++
}
