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|
package list
import (
"fmt"
"reflect"
"testing"
)
func TestListNew(t *testing.T) {
t.Run("when items a slice nil", func(t *testing.T) {
_, err := New([]int{1, 2, 3}, 3)
if err != nil {
t.Errorf("Expected no errors, error %v", err)
}
})
t.Run("when items is nil", func(t *testing.T) {
_, err := New(nil, 3)
if err == nil {
t.Errorf("Expected error got none")
}
})
t.Run("when items is not a slice", func(t *testing.T) {
_, err := New("1,2,3", 3)
if err == nil {
t.Errorf("Expected error got none")
}
})
}
func TestListMovement(t *testing.T) {
letters := []rune{'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j'}
l, err := New(letters, 4)
if err != nil {
t.Fatalf("Expected no error, got %v", err)
}
tcs := []struct {
expect []rune
move string
selected rune
}{
{move: "next", selected: 'b', expect: []rune{'a', 'b', 'c', 'd'}},
{move: "prev", selected: 'a', expect: []rune{'a', 'b', 'c', 'd'}},
{move: "prev", selected: 'a', expect: []rune{'a', 'b', 'c', 'd'}},
{move: "next", selected: 'b', expect: []rune{'a', 'b', 'c', 'd'}},
{move: "next", selected: 'c', expect: []rune{'a', 'b', 'c', 'd'}},
{move: "next", selected: 'd', expect: []rune{'a', 'b', 'c', 'd'}},
{move: "next", selected: 'e', expect: []rune{'b', 'c', 'd', 'e'}},
{move: "prev", selected: 'd', expect: []rune{'b', 'c', 'd', 'e'}},
{move: "up", selected: 'a', expect: []rune{'a', 'b', 'c', 'd'}},
{move: "up", selected: 'a', expect: []rune{'a', 'b', 'c', 'd'}},
{move: "down", selected: 'e', expect: []rune{'e', 'f', 'g', 'h'}},
{move: "down", selected: 'g', expect: []rune{'g', 'h', 'i', 'j'}},
{move: "down", selected: 'j', expect: []rune{'g', 'h', 'i', 'j'}},
}
for _, tc := range tcs {
t.Run(fmt.Sprintf("list %s", tc.move), func(t *testing.T) {
switch tc.move {
case "next":
l.Next()
case "prev":
l.Prev()
case "up":
l.PageUp()
case "down":
l.PageDown()
default:
t.Fatalf("unknown move %q", tc.move)
}
list, idx := l.Items()
got := castList(list)
if !reflect.DeepEqual(tc.expect, got) {
t.Errorf("expected %q, got %q", tc.expect, got)
}
selected := list[idx]
if tc.selected != selected {
t.Errorf("expected selected to be %q, got %q", tc.selected, selected)
}
})
}
}
func TestListPageDown(t *testing.T) {
t.Run("when list has fewer items than page size", func(t *testing.T) {
letters := []rune{'a', 'b'}
l, err := New(letters, 4)
if err != nil {
t.Fatalf("Expected no error, got %v", err)
}
l.PageDown()
list, idx := l.Items()
expected := 'b'
selected := list[idx]
if selected != expected {
t.Errorf("expected selected to be %q, got %q", expected, selected)
}
})
}
func TestListComparion(t *testing.T) {
t.Run("when item supports comparison", func(t *testing.T) {
type comparable struct {
Number int
}
structs := []comparable{
{Number: 1},
{Number: 2},
}
l, err := New(structs, 4)
if err != nil {
t.Fatalf("Expected no error, got %v", err)
}
idx := l.Index()
if idx != 0 {
t.Errorf("expected index to be first, got %d", idx)
}
})
t.Run("when item doesn't support comparison", func(t *testing.T) {
type uncomparable struct {
Numbers []int
}
structs := []uncomparable{
{Numbers: []int{1}},
{Numbers: []int{2}},
}
l, err := New(structs, 4)
if err != nil {
t.Fatalf("Expected no error, got %v", err)
}
idx := l.Index()
if idx != 0 {
t.Errorf("expected index to be first, got %d", idx)
}
})
}
func castList(list []interface{}) []rune {
result := make([]rune, len(list))
for i, l := range list {
result[i] = l.(rune)
}
return result
}
|
