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groupby_test.go
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groupby_test.go
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package linq
import (
"reflect"
"testing"
)
func TestGroupBy(t *testing.T) {
input := []int{1, 2, 3, 4, 5, 6, 7, 8, 9}
wantEven := []interface{}{2, 4, 6, 8}
wantOdd := []interface{}{1, 3, 5, 7, 9}
q := From(input).GroupBy(
func(i interface{}) interface{} { return i.(int) % 2 },
func(i interface{}) interface{} { return i.(int) },
)
next := q.Iterate()
eq := true
for item, ok := next(); ok; item, ok = next() {
group := item.(Group)
switch group.Key.(int) {
case 0:
if !reflect.DeepEqual(group.Group, wantEven) {
eq = false
}
case 1:
if !reflect.DeepEqual(group.Group, wantOdd) {
eq = false
}
default:
eq = false
}
}
if !eq {
t.Errorf("From(%v).GroupBy()=%v", input, toSlice(q))
}
}
func TestGroupByT_PanicWhenKeySelectorFnIsInvalid(t *testing.T) {
mustPanicWithError(t, "GroupByT: parameter [keySelectorFn] has a invalid function signature. Expected: 'func(T)T', actual: 'func(int,int)bool'", func() {
var r []int
From([]int{1, 1, 1, 2, 1, 2, 3, 4, 2}).GroupByT(
func(i, j int) bool { return true },
func(i int) int { return i },
).ToSlice(&r)
})
}
func TestGroupByT_PanicWhenElementSelectorFnIsInvalid(t *testing.T) {
mustPanicWithError(t, "GroupByT: parameter [elementSelectorFn] has a invalid function signature. Expected: 'func(T)T', actual: 'func(int,int)int'", func() {
var r []int
From([]int{1, 1, 1, 2, 1, 2, 3, 4, 2}).GroupByT(
func(i int) bool { return true },
func(i, j int) int { return i },
).ToSlice(&r)
})
}