add wireexample;

wireexample/cmd/example_01/main.go

@@ -0,0 +1,29 @@
+// 展示 wire 的两种 mock 实现
+
+package main
+
+import "fmt"
+
+func main() {
+	approachA()
+	approachB()
+}
+
+// approach A:
+//   - 需要 mock 的对象定义成接口, 真正的实现和 mock 分别实现接口;
+//   - injector 函数使用 接口类型参数, 测试时传入 mock 对象;
+func approachA() {
+	rander := &MockRander{}
+	guess := InjectGuessWithoutMock(rander)
+	rander.Value = 1
+	fmt.Println("approachA:", guess.Guess(10))
+}
+
+// approach B:
+//   - mock 和 真正的实现分别定义到两组 injector 中, injector 提供1个对象包含要测试的对象和 mock;
+//   - 测试时调用 mock injector 返回对象(包含要测试的对象和 mock);
+func approachB() {
+	guessWithMock := InjectMockGuess()
+	guessWithMock.Mock.Value = 1
+	fmt.Println("approachB:", guessWithMock.Guess.Guess(10))
+}

wireexample/cmd/example_01/provider.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"fmt"
+	"math/rand"
+
+	"github.com/google/wire"
+)
+
+type Rander interface {
+	Rand() int
+}
+
+type DefaultRander struct{}
+
+func (r *DefaultRander) Rand() int {
+	return rand.Int()
+}
+
+func NewRander() *DefaultRander {
+	return &DefaultRander{}
+}
+
+type MockRander struct {
+	Value int
+}
+
+func (r *MockRander) Rand() int {
+	return r.Value
+}
+
+type Guess struct {
+	rander Rander
+}
+
+func (g *Guess) Guess(guess int) string {
+	return fmt.Sprintf("you guess %d, real number is %d", guess, g.rander.Rand())
+}
+
+func NewGuess(rander Rander) *Guess {
+	return &Guess{
+		rander: rander,
+	}
+}
+
+type GuessWithMock struct {
+	Guess *Guess
+	Mock  *MockRander
+}
+
+var GuessProviderSetWithoutMock = wire.NewSet(NewGuess)
+
+var GuessProviderSet = wire.NewSet(
+	NewRander,
+	NewGuess,
+	wire.Bind(new(Rander), new(*DefaultRander)),
+)
+
+var MockGuessProviderSet = wire.NewSet(
+	wire.Struct(new(MockRander)),
+	NewGuess,
+	wire.Bind(new(Rander), new(*MockRander)),
+	wire.Struct(new(GuessWithMock), "*"),
+)

wireexample/cmd/example_01/wire.go

@@ -0,0 +1,20 @@
+//go:build wireinject
+
+package main
+
+import "github.com/google/wire"
+
+// Approach A
+func InjectGuessWithoutMock(rander Rander) *Guess {
+	panic(wire.Build(GuessProviderSetWithoutMock))
+}
+
+// Approach B
+func InjectRealGuess() *Guess {
+	panic(wire.Build(GuessProviderSet))
+}
+
+// Approach B
+func InjectMockGuess() *GuessWithMock {
+	panic(wire.Build(MockGuessProviderSet))
+}

wireexample/cmd/example_01/wire_gen.go

@@ -0,0 +1,33 @@
+// Code generated by Wire. DO NOT EDIT.
+
+//go:generate go run github.com/google/wire/cmd/wire
+//go:build !wireinject
+// +build !wireinject
+
+package main
+
+// Injectors from wire.go:
+
+// Approach A
+func InjectGuessWithoutMock(rander Rander) *Guess {
+	guess := NewGuess(rander)
+	return guess
+}
+
+// Approach B
+func InjectRealGuess() *Guess {
+	defaultRander := NewRander()
+	guess := NewGuess(defaultRander)
+	return guess
+}
+
+// Approach B
+func InjectMockGuess() *GuessWithMock {
+	mockRander := &MockRander{}
+	guess := NewGuess(mockRander)
+	guessWithMock := &GuessWithMock{
+		Guess: guess,
+		Mock:  mockRander,
+	}
+	return guessWithMock
+}

wireexample/go.mod

@@ -0,0 +1,5 @@
+module git.blauwelle.com/go/crate/wireexample
+
+go 1.20
+
+require github.com/google/wire v0.5.0

wireexample/go.sum

@@ -0,0 +1,10 @@
+github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
+github.com/google/subcommands v1.0.1/go.mod h1:ZjhPrFU+Olkh9WazFPsl27BQ4UPiG37m3yTrtFlrHVk=
+github.com/google/wire v0.5.0 h1:I7ELFeVBr3yfPIcc8+MWvrjk+3VjbcSzoXm3JVa+jD8=
+github.com/google/wire v0.5.0/go.mod h1:ngWDr9Qvq3yZA10YrxfyGELY/AFWGVpy9c1LTRi1EoU=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190422233926-fe54fb35175b/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=