github.com/bytedance/mockey@v1.2.10/internal/monkey/patch_test.go (about)

     1  /*
     2   * Copyright 2022 ByteDance Inc.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package monkey
    18  
    19  import (
    20  	"reflect"
    21  	"testing"
    22  
    23  	"github.com/smartystreets/goconvey/convey"
    24  )
    25  
    26  //go:noinline
    27  func Target() int {
    28  	return 0
    29  }
    30  
    31  func Hook() int {
    32  	return 2
    33  }
    34  
    35  func UnsafeTarget() {}
    36  
    37  func TestPatchFunc(t *testing.T) {
    38  	convey.Convey("TestPatchFunc", t, func() {
    39  		convey.Convey("normal", func() {
    40  			var proxy func() int
    41  			patch := PatchFunc(Target, Hook, &proxy, false)
    42  			convey.So(Target(), convey.ShouldEqual, 2)
    43  			convey.So(proxy(), convey.ShouldEqual, 0)
    44  			patch.Unpatch()
    45  			convey.So(Target(), convey.ShouldEqual, 0)
    46  		})
    47  		convey.Convey("anonymous hook", func() {
    48  			var proxy func() int
    49  			patch := PatchFunc(Target, func() int { return 2 }, &proxy, false)
    50  			convey.So(Target(), convey.ShouldEqual, 2)
    51  			convey.So(proxy(), convey.ShouldEqual, 0)
    52  			patch.Unpatch()
    53  			convey.So(Target(), convey.ShouldEqual, 0)
    54  		})
    55  		convey.Convey("closure hook", func() {
    56  			var proxy func() int
    57  			hookBuilder := func(x int) func() int {
    58  				return func() int { return x }
    59  			}
    60  			patch := PatchFunc(Target, hookBuilder(2), &proxy, false)
    61  			convey.So(Target(), convey.ShouldEqual, 2)
    62  			convey.So(proxy(), convey.ShouldEqual, 0)
    63  			patch.Unpatch()
    64  			convey.So(Target(), convey.ShouldEqual, 0)
    65  		})
    66  		convey.Convey("reflect hook", func() {
    67  			var proxy func() int
    68  			hookVal := reflect.MakeFunc(reflect.TypeOf(Hook), func(args []reflect.Value) (results []reflect.Value) { return []reflect.Value{reflect.ValueOf(2)} })
    69  			patch := PatchFunc(Target, hookVal.Interface(), &proxy, false)
    70  			convey.So(Target(), convey.ShouldEqual, 2)
    71  			convey.So(proxy(), convey.ShouldEqual, 0)
    72  			patch.Unpatch()
    73  			convey.So(Target(), convey.ShouldEqual, 0)
    74  		})
    75  		convey.Convey("unsafe", func() {
    76  			var proxy func()
    77  			patch := PatchFunc(UnsafeTarget, func() { panic("good") }, &proxy, true)
    78  			convey.So(func() { UnsafeTarget() }, convey.ShouldPanicWith, "good")
    79  			convey.So(func() { proxy() }, convey.ShouldNotPanic)
    80  			patch.Unpatch()
    81  			convey.So(func() { UnsafeTarget() }, convey.ShouldNotPanic)
    82  		})
    83  	})
    84  }