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package stack
import (
"testing"
)
func Test(t *testing.T) {
s := New()
if s.Len() != 0 {
t.Errorf("Length of an empty stack should be 0")
}
s.Push(1)
if s.Len() != 1 {
t.Errorf("Length should be 0")
}
if s.Peek().(int) != 1 {
t.Errorf("Top item on the stack should be 1")
}
if s.Pop().(int) != 1 {
t.Errorf("Top item should have been 1")
}
if s.Len() != 0 {
t.Errorf("Stack should be empty")
}
s.Push(1)
s.Push(2)
if s.Len() != 2 {
t.Errorf("Length should be 2")
}
if s.Peek().(int) != 2 {
t.Errorf("Top of the stack should be 2")
}
}
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