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package collection
import (
"fmt"
"testing"
)
func TestStack_NewStack_FromEmpty(t *testing.T) {
subject := NewStack()
subject.Push("alfa")
subject.Push("bravo")
subject.Push("charlie")
if result, ok := subject.Pop(); result != "charlie" || ok != true {
t.Logf("got: %s %v\nwant: %s %v", result, ok, "charlie", true)
t.Fail()
}
if result, ok := subject.Pop(); result != "bravo" || ok != true {
t.Logf("got: %s %v\nwant: %s %v", result, ok, "bravo", true)
t.Fail()
}
if result, ok := subject.Pop(); result != "alfa" || ok != true {
t.Logf("got: %s %v\nwant: %s %v", result, ok, "alfa", true)
t.Fail()
}
if !subject.IsEmpty() {
t.Log("subject should have been empty.")
t.Fail()
}
}
func ExampleNewStack() {
subject := NewStack(1, 2, 3)
for !subject.IsEmpty() {
val, _ := subject.Pop()
fmt.Println(val)
}
// Output:
// 3
// 2
// 1
}
func TestStack_Push_NonConstructor(t *testing.T) {
subject := &Stack{}
sizeAssertion := func(want uint) {
if got := subject.Size(); got != want {
t.Logf("got: %d\nwant:%d\n", got, want)
t.Fail()
}
}
sizeAssertion(0)
subject.Push(1)
sizeAssertion(1)
subject.Push(2)
sizeAssertion(2)
if result, ok := subject.Pop(); !ok {
t.Logf("Pop is not ok")
t.Fail()
} else if result != 2 {
t.Logf("got: %d\nwant: %d", result, 2)
t.Fail()
}
}
func TestStack_Pop_NonConstructorEmpty(t *testing.T) {
subject := &Stack{}
if result, ok := subject.Pop(); ok {
t.Logf("Pop should not have been okay")
t.Fail()
} else if result != nil {
t.Logf("got: %v\nwant: %v", result, nil)
}
}
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