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group_test.go
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package underscore
import (
"reflect"
"testing"
"github.com/stretchr/testify/assert"
)
func Benchmark_Group(b *testing.B) {
for n := 0; n < b.N; n++ {
dst := make([]int, 0)
Range(1, benchmarkSize, 1).Group(func(n, _ int) string {
if n%2 == 0 {
return "even"
}
return "odd"
}).Value(&dst)
}
}
func Test_Group(t *testing.T) {
t.Run("default", func(t *testing.T) {
res := make(map[string][]int)
Chain([]int{1, 2, 3, 4, 5}).Group(func(n, _ int) string {
if n%2 == 0 {
return "even"
}
return "odd"
}).Value(&res)
assert.EqualValues(
t,
res,
map[string][]int{
"odd": {1, 3, 5},
"even": {2, 4},
},
)
})
t.Run("reflect.Value", func(t *testing.T) {
resValue := reflect.New(
reflect.MapOf(
reflect.TypeOf(""),
reflect.TypeOf([]int{}),
),
)
Chain([]int{1, 2, 3, 4, 5}).Group(func(n, _ int) string {
if n%2 == 0 {
return "even"
}
return "odd"
}).Value(resValue)
assert.EqualValues(
t,
resValue.Elem().Interface(),
map[string][]int{
"odd": {1, 3, 5},
"even": {2, 4},
},
)
})
}
func Test_GroupBy(t *testing.T) {
t.Run("default", func(t *testing.T) {
src := []testModel{
{ID: 1, Name: "a"},
{ID: 2, Name: "a"},
{ID: 3, Name: "b"},
{ID: 4, Name: "b"},
}
res := make(map[string][]testModel)
Chain(src).GroupBy("Name").Value(&res)
assert.EqualValues(
t,
res,
map[string][]testModel{
"a": {src[0], src[1]},
"b": {src[2], src[3]},
},
)
})
t.Run("reflect.Value", func(t *testing.T) {
src := []testModel{
{ID: 1, Name: "a"},
{ID: 2, Name: "a"},
{ID: 3, Name: "b"},
{ID: 4, Name: "b"},
}
res := reflect.New(
reflect.MapOf(
reflect.TypeOf(src[0].Name),
reflect.TypeOf(src),
),
)
Chain(src).GroupBy("name").Value(res)
assert.EqualValues(
t,
res.Elem().Interface(),
map[string][]testModel{
"a": {src[0], src[1]},
"b": {src[2], src[3]},
},
)
})
}