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interceptors_test.go
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interceptors_test.go
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// Copyright 2018 Twitch Interactive, Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may not
// use this file except in compliance with the License. A copy of the License is
// located at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// or in the "license" file accompanying this file. This file is distributed on
// an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
// express or implied. See the License for the specific language governing
// permissions and limitations under the License.
package twirp
import (
"context"
"testing"
)
func TestChainInterceptors(t *testing.T) {
if chain := ChainInterceptors(); chain != nil {
t.Errorf("ChainInterceptors(0) expected to be nil, but was %v", chain)
}
if chain := ChainInterceptors(nil); chain != nil {
t.Errorf("ChainInterceptors(0) expected to be nil, but was %v", chain)
}
if chain := ChainInterceptors(nil, nil); chain != nil {
t.Errorf("ChainInterceptors(0) expected to be nil, but was %v", chain)
}
interceptor1 := func(next Method) Method {
return func(ctx context.Context, request interface{}) (interface{}, error) {
response, err := next(ctx, request.(string)+"a")
return response.(string) + "1", err
}
}
interceptor2 := func(next Method) Method {
return func(ctx context.Context, request interface{}) (interface{}, error) {
response, err := next(ctx, request.(string)+"b")
return response.(string) + "2", err
}
}
interceptor3 := func(next Method) Method {
return func(ctx context.Context, request interface{}) (interface{}, error) {
response, err := next(ctx, request.(string)+"c")
return response.(string) + "3", err
}
}
method := func(ctx context.Context, request interface{}) (interface{}, error) {
return request.(string) + "x", nil
}
for _, testCase := range []struct {
interceptors []Interceptor
want string
}{
{
interceptors: []Interceptor{interceptor1},
want: "ax1",
},
{
interceptors: []Interceptor{interceptor1, interceptor2},
want: "abx21",
},
{
interceptors: []Interceptor{interceptor1, interceptor2, interceptor3},
want: "abcx321",
},
{
interceptors: []Interceptor{interceptor1, interceptor2, nil, interceptor3},
want: "abcx321",
},
{
interceptors: []Interceptor{interceptor1, interceptor1, interceptor1},
want: "aaax111",
},
} {
response, err := ChainInterceptors(testCase.interceptors...)(method)(context.Background(), "")
if err != nil {
t.Fatalf("ChainInterceptors(%d) method has unexpected err %v", len(testCase.interceptors), err)
}
if response != testCase.want {
t.Errorf("ChainInterceptors(%d) has unexpected value, have=%v, want=%v", len(testCase.interceptors), response, testCase.want)
}
}
}