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ring_test.go
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ring_test.go
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package gring
import (
"testing"
"github.com/stretchr/testify/assert"
)
func TestNew(t *testing.T) {
r := New()
assert.NotNil(t, r)
assert.NotNil(t, r.nodes)
}
func TestNewFromTour(t *testing.T) {
r := NewFromArray([]int{2, 1, 0, 4, 3})
assert.NotNil(t, r)
assert.NotNil(t, r.nodes)
assert.Equal(t, []int{0, 4, 3, 2, 1}, r.tour())
}
func TestAdd(t *testing.T) {
r := New()
r.Add()
assert.Equal(t, 1, len(r.nodes))
r.Add()
assert.Equal(t, 2, len(r.nodes))
assert.Equal(t, []int{0, 1}, r.tour())
r.Add()
r.Add()
r.Add()
r.Add()
assert.Equal(t, []int{0, 1, 2, 3, 4, 5}, r.tour())
}
func TestAddWithValue(t *testing.T) {
r := New()
r.AddWithValue("mdoe")
r.AddWithValue("abc")
r.AddWithValue("sawyer")
assert.Equal(t, []int{0, 1, 2}, r.tour())
}
func TestSetValue(t *testing.T) {
r := NewFromArray([]int{2, 1, 0, 4, 3})
r.SetValue(1, "hello")
}
func TestInsertAfter(t *testing.T) {
r := NewFromArray([]int{2, 1, 0, 4, 3})
assert.Equal(t, []int{0, 4, 3, 2, 1}, r.tour())
r.InsertAfter(0, 3)
assert.Equal(t, []int{4, 3, 0, 2, 1}, r.tour())
r.InsertAfter(4, 2)
assert.Equal(t, []int{3, 0, 2, 4, 1}, r.tour())
r.InsertAfter(4, 2)
assert.Equal(t, []int{3, 0, 2, 4, 1}, r.tour())
r.InsertAfter(2, 4)
assert.Equal(t, []int{3, 0, 4, 2, 1}, r.tour())
r.InsertAfter(0, 2)
assert.Equal(t, []int{3, 4, 2, 0, 1}, r.tour())
assert.Equal(t, 5, r.Len())
}
func TestInsertBefore(t *testing.T) {
r := NewFromArray([]int{2, 1, 0, 4, 3})
assert.Equal(t, []int{0, 4, 3, 2, 1}, r.tour())
r.InsertBefore(0, 3)
assert.Equal(t, []int{4, 0, 3, 2, 1}, r.tour())
r.InsertBefore(4, 2)
assert.Equal(t, []int{0, 3, 4, 2, 1}, r.tour())
r.InsertBefore(4, 2)
assert.Equal(t, []int{0, 3, 4, 2, 1}, r.tour())
r.InsertBefore(2, 4)
assert.Equal(t, []int{0, 3, 2, 4, 1}, r.tour())
r.InsertBefore(0, 2)
assert.Equal(t, []int{3, 0, 2, 4, 1}, r.tour())
assert.Equal(t, 5, r.Len())
}
func TestDetach(t *testing.T) {
r := NewFromArray([]int{2, 1, 0, 4, 3})
r.Detach(3)
assert.Equal(t, []int{0, 4, 2, 1}, r.tour())
r.Detach(2)
assert.Equal(t, []int{0, 4, 1}, r.tour())
assert.Equal(t, 3, r.Len())
r.Detach(0)
assert.Equal(t, []int{4, 1}, r.tour())
assert.Equal(t, 2, r.Len())
}
func TestSwap(t *testing.T) {
r := NewFromArray([]int{2, 1, 0, 4, 3})
assert.Equal(t, []int{0, 4, 3, 2, 1}, r.tour())
var err error
err = r.Swap(1, 3)
assert.Nil(t, err)
assert.Equal(t, []int{0, 4, 1, 2, 3}, r.tour())
err = r.Swap(0, 4)
assert.Nil(t, err)
assert.Equal(t, []int{1, 2, 3, 4, 0}, r.tour())
err = r.Swap(0, 4)
assert.Nil(t, err)
assert.Equal(t, []int{1, 2, 3, 0, 4}, r.tour())
assert.Equal(t, 5, r.Len())
}
func TestTwoOptSwap(t *testing.T) {
r := NewFromArray([]int{0, 1, 3, 4, 5, 6, 2})
var err error
err = r.TwoOptSwap(0, 2)
assert.Nil(t, err)
assert.Equal(t, []int{0, 2, 6, 5, 4, 3, 1}, r.tour())
err = r.TwoOptSwap(2, 1)
assert.Nil(t, err)
assert.Equal(t, []int{0, 2, 1, 3, 4, 5, 6}, r.tour())
err = r.TwoOptSwap(3, 6)
assert.Nil(t, err)
assert.Equal(t, []int{0, 2, 1, 3, 6, 5, 4}, r.tour())
err = r.TwoOptSwap(2, 3)
assert.Nil(t, err)
assert.Equal(t, []int{0, 2, 3, 1, 6, 5, 4}, r.tour())
assert.Equal(t, 7, r.Len())
}
func TestReverse(t *testing.T) {
var err error
r := NewFromArray([]int{2, 1, 0, 4, 3})
assert.Equal(t, []int{0, 4, 3, 2, 1}, r.tour())
err = r.Reverse()
assert.Nil(t, err)
assert.Equal(t, []int{0, 1, 2, 3, 4}, r.tour())
err = r.Reverse()
assert.Nil(t, err)
assert.Equal(t, []int{0, 4, 3, 2, 1}, r.tour())
assert.Equal(t, 5, r.Len())
}
func TestClone(t *testing.T) {
r := NewFromArray([]int{2, 1, 0, 4, 3})
assert.Equal(t, []int{0, 4, 3, 2, 1}, r.tour())
clone := r.Clone()
assert.Equal(t, []int{0, 4, 3, 2, 1}, clone.tour())
r.Reverse()
assert.Equal(t, []int{0, 1, 2, 3, 4}, r.tour())
assert.Equal(t, []int{0, 4, 3, 2, 1}, clone.tour())
clone.Swap(4, 2)
assert.Equal(t, []int{0, 1, 2, 3, 4}, r.tour())
assert.Equal(t, []int{0, 2, 3, 4, 1}, clone.tour())
assert.Equal(t, 5, r.Len())
assert.Equal(t, 5, clone.Len())
}
func TestIterator(t *testing.T) {
r := NewFromArray([]int{2, 1, 0, 4, 3})
assert.Equal(t, []int{0, 4, 3, 2, 1}, r.tour())
r.SetValue(0, "Hi")
r.SetValue(4, "This")
r.SetValue(3, "is")
r.SetValue(2, "Circular")
r.SetValue(1, "List")
order := make([]int, 0)
values := make([]string, 0)
iter, err := r.Iterator()
assert.Nil(t, err)
for iter.Next() {
order = append(order, iter.Index())
values = append(values, iter.Value().(string))
}
assert.Equal(t, []int{0, 4, 3, 2, 1}, order)
assert.Equal(t, []string{"Hi", "This", "is", "Circular", "List"}, values)
r.Reverse()
order = make([]int, 0)
values = make([]string, 0)
iter, err = r.Iterator()
for iter.Next() {
order = append(order, iter.Index())
values = append(values, iter.Value().(string))
}
assert.Equal(t, []int{0, 1, 2, 3, 4}, order)
assert.Equal(t, []string{"Hi", "List", "Circular", "is", "This"}, values)
}
func TestIteratorSingleElement(t *testing.T) {
r := NewFromArray([]int{0})
assert.Equal(t, []int{0}, r.tour())
r.SetValue(0, "Hi")
order := make([]int, 0)
values := make([]string, 0)
iter, err := r.Iterator()
assert.Nil(t, err)
for iter.Next() {
order = append(order, iter.Index())
values = append(values, iter.Value().(string))
}
assert.Equal(t, []int{0}, order)
assert.Equal(t, []string{"Hi"}, values)
}
func TestIteratorEmptyRing(t *testing.T) {
r := New()
iter, err := r.Iterator()
assert.Nil(t, iter)
assert.Equal(t, err, ErrEmptyRing)
}