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httpmid_test.go
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httpmid_test.go
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package httpmid_test
import (
"net/http"
"testing"
"github.com/pkg-id/httpmid"
)
func TestReduce(t *testing.T) {
trace := make([]int, 0)
m1 := func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
trace = append(trace, -1)
defer func() {
trace = append(trace, 1)
}()
next.ServeHTTP(w, r)
})
}
m2 := func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
trace = append(trace, -2)
defer func() {
trace = append(trace, 2)
}()
next.ServeHTTP(w, r)
})
}
m3 := func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
trace = append(trace, -3)
defer func() {
trace = append(trace, 3)
}()
next.ServeHTTP(w, r)
})
}
h := func(w http.ResponseWriter, r *http.Request) {
trace = append(trace, 0)
}
expectedTrace := []int{-3, -2, -1, 0, 1, 2, 3}
httpmid.Reduce(m3, m2, m1).Then(http.HandlerFunc(h)).ServeHTTP(nil, nil)
if len(trace) != len(expectedTrace) {
t.Fatalf("expected trace to be %v, but got %v", expectedTrace, trace)
}
}