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stack_test.go
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stack_test.go
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package datastructures
import (
"reflect"
"testing"
)
func TestStack_Size(t *testing.T) {
tests := []struct {
name string
items []interface{}
want int
}{
{
name: "empty test case",
want: 0,
},
{
name: "3 items stack",
items: []interface{}{1, "Helllo", 3.4},
want: 3,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
s := NewStack()
for _, item := range tt.items {
s.Push(item)
}
if got := s.Size(); got != tt.want {
t.Errorf("Stack.Size() = %v, want %v", got, tt.want)
}
})
}
}
func TestStack_IsEmpty(t *testing.T) {
tests := []struct {
name string
want bool
}{
{
name: "empty test case",
want: true,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
s := NewStack()
if got := s.IsEmpty(); got != tt.want {
t.Errorf("Stack.IsEmpty() = %v, want %v", got, tt.want)
}
})
}
}
func TestStack_Push(t *testing.T) {
type args struct {
item interface{}
}
tests := []struct {
name string
args args
want *Stack
}{
{
name: "sample test case",
args: args{
item: "Hello World",
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
s := NewStack()
s.Push(tt.args.item)
if got := s.Size(); got != 1 {
t.Errorf("Stack.Size() = %v, want %v", s.Size(), 1)
}
})
}
}
func TestStack_Pop(t *testing.T) {
tests := []struct {
name string
items []interface{}
want interface{}
wantErr bool
}{
{
name: "3 items",
items: []interface{}{"Hello", "World", "Guys"},
want: "Guys",
},
{
name: "empty stack",
wantErr: true,
},
{
name: "1 item stack",
items: []interface{}{"Hello"},
want: "Hello",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
s := NewStack()
for _, item := range tt.items {
s.Push(item)
}
got, err := s.Pop()
if (err != nil) != tt.wantErr {
t.Errorf("Stack.Pop() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("Stack.Pop() = %v, want %v", got, tt.want)
}
})
}
}
func TestStack_Multiple_Pop(t *testing.T) {
s := NewStack()
s.Push("One").Push("Two").Push("Three").Push("Four").Push("Five")
poped, err := s.Pop()
if err != nil {
t.Errorf("Stack.Pop() error = %v, wantErr %v", err, false)
return
}
if poped != "Five" {
t.Errorf("Stack.Pop() = %v, want %v", poped, "Five")
}
poped, err = s.Pop()
if err != nil {
t.Errorf("Stack.Pop() error = %v, wantErr %v", err, false)
return
}
if poped != "Four" {
t.Errorf("Stack.Pop() = %v, want %v", poped, "Four")
}
poped, err = s.Pop()
if err != nil {
t.Errorf("Stack.Pop() error = %v, wantErr %v", err, false)
return
}
if poped != "Three" {
t.Errorf("Stack.Pop() = %v, want %v", poped, "Three")
}
}
func TestStack_Peek(t *testing.T) {
tests := []struct {
name string
items []string
want interface{}
wantErr bool
}{
{
name: "empty stack",
wantErr: true,
},
{
name: "5 items stack",
items: []string{"One", "Two", "Three", "Four", "Five"},
want: "Five",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
s := NewStack()
for _, item := range tt.items {
s.Push(item)
}
got, err := s.Peek()
if (err != nil) != tt.wantErr {
t.Errorf("Stack.Peek() error = %v, wantErr %v", err, tt.wantErr)
return
}
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("Stack.Peek() = %v, want %v", got, tt.want)
}
})
}
}
func TestStack_Iterate(t *testing.T) {
tests := []struct {
name string
items []string
}{
{
name: "10 items",
items: []string{"1", "2", "3", "4", "5", "6", "7", "8", "9", "10"},
},
{
name: "empty stack",
},
{
name: "3 items",
items: []string{"One", "Two", "Three"},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
s := NewStack()
s.Iterate(func(index int, item interface{}) {
if tt.items[index] != item {
t.Errorf("index: %d, expected = %v, got = %v", index, tt.items[index], item)
}
})
})
}
}
func TestStack_Contains(t *testing.T) {
type args struct {
item interface{}
}
tests := []struct {
name string
items []int
args args
want bool
}{
{
name: "existing item",
items: []int{1, 2, 3, 4, 5},
args: args{
item: 4,
},
want: true,
},
{
name: "missing item",
items: []int{1, 2, 3},
args: args{
item: 10,
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
s := NewStack()
for _, item := range tt.items {
s.Push(item)
}
if got := s.Contains(tt.args.item); got != tt.want {
t.Errorf("Stack.Contains() = %v, want %v", got, tt.want)
}
})
}
}