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// Copyright 2011 Google Inc. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
// Package aetesting provides utilities for testing App Engine packages.
// This is not for testing user applications.
package aetesting
import (
"fmt"
"net/http"
"reflect"
"testing"
"github.com/golang/protobuf/proto"
"golang.org/x/net/context"
"google.golang.org/appengine/internal"
)
// FakeSingleContext returns a context whose Call invocations will be serviced
// by f, which should be a function that has two arguments of the input and output
// protocol buffer type, and one error return.
func FakeSingleContext(t *testing.T, service, method string, f interface{}) context.Context {
fv := reflect.ValueOf(f)
if fv.Kind() != reflect.Func {
t.Fatal("not a function")
}
ft := fv.Type()
if ft.NumIn() != 2 || ft.NumOut() != 1 {
t.Fatalf("f has %d in and %d out, want 2 in and 1 out", ft.NumIn(), ft.NumOut())
}
for i := 0; i < 2; i++ {
at := ft.In(i)
if !at.Implements(protoMessageType) {
t.Fatalf("arg %d does not implement proto.Message", i)
}
}
if ft.Out(0) != errorType {
t.Fatalf("f's return is %v, want error", ft.Out(0))
}
s := &single{
t: t,
service: service,
method: method,
f: fv,
}
return internal.WithCallOverride(internal.ContextForTesting(&http.Request{}), s.call)
}
var (
protoMessageType = reflect.TypeOf((*proto.Message)(nil)).Elem()
errorType = reflect.TypeOf((*error)(nil)).Elem()
)
type single struct {
t *testing.T
service, method string
f reflect.Value
}
func (s *single) call(ctx context.Context, service, method string, in, out proto.Message) error {
if service == "__go__" {
if method == "GetNamespace" {
return nil // always yield an empty namespace
}
return fmt.Errorf("Unknown API call /%s.%s", service, method)
}
if service != s.service || method != s.method {
s.t.Fatalf("Unexpected call to /%s.%s", service, method)
}
ins := []reflect.Value{
reflect.ValueOf(in),
reflect.ValueOf(out),
}
outs := s.f.Call(ins)
if outs[0].IsNil() {
return nil
}
return outs[0].Interface().(error)
}
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