Overview ▾

The testgen plugin generates Test and Benchmark functions for each message.

Tests are enabled using the following extensions:

- testgen
- testgen_all

Benchmarks are enabled using the following extensions:

- benchgen
- benchgen_all

Let us look at:

github.com/gogo/protobuf/test/example/example.proto

Btw all the output can be seen at:

github.com/gogo/protobuf/test/example/*

The following message:

  option (gogoproto.testgen_all) = true;
  option (gogoproto.benchgen_all) = true;

  message A {
	optional string Description = 1 [(gogoproto.nullable) = false];
	optional int64 Number = 2 [(gogoproto.nullable) = false];
	optional bytes Id = 3 [(gogoproto.customtype) = "github.com/gogo/protobuf/test/custom.Uuid", (gogoproto.nullable) = false];
  }

given to the testgen plugin, will generate the following test code:

func TestAProto(t *testing.T) {
	popr := math_rand.New(math_rand.NewSource(time.Now().UnixNano()))
	p := NewPopulatedA(popr, false)
	dAtA, err := github_com_gogo_protobuf_proto.Marshal(p)
	if err != nil {
		panic(err)
	}
	msg := &A{}
	if err := github_com_gogo_protobuf_proto.Unmarshal(dAtA, msg); err != nil {
		panic(err)
	}
	for i := range dAtA {
		dAtA[i] = byte(popr.Intn(256))
	}
	if err := p.VerboseEqual(msg); err != nil {
		t.Fatalf("%#v !VerboseProto %#v, since %v", msg, p, err)
	}
	if !p.Equal(msg) {
		t.Fatalf("%#v !Proto %#v", msg, p)
	}
}

func BenchmarkAProtoMarshal(b *testing.B) {
	popr := math_rand.New(math_rand.NewSource(616))
	total := 0
	pops := make([]*A, 10000)
	for i := 0; i < 10000; i++ {
		pops[i] = NewPopulatedA(popr, false)
	}
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		dAtA, err := github_com_gogo_protobuf_proto.Marshal(pops[i%10000])
		if err != nil {
			panic(err)
		}
		total += len(dAtA)
	}
	b.SetBytes(int64(total / b.N))
}

func BenchmarkAProtoUnmarshal(b *testing.B) {
	popr := math_rand.New(math_rand.NewSource(616))
	total := 0
	datas := make([][]byte, 10000)
	for i := 0; i < 10000; i++ {
		dAtA, err := github_com_gogo_protobuf_proto.Marshal(NewPopulatedA(popr, false))
		if err != nil {
			panic(err)
		}
		datas[i] = dAtA
	}
	msg := &A{}
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		total += len(datas[i%10000])
		if err := github_com_gogo_protobuf_proto.Unmarshal(datas[i%10000], msg); err != nil {
			panic(err)
		}
	}
	b.SetBytes(int64(total / b.N))
}

func TestAJSON(t *testing1.T) {
	popr := math_rand1.New(math_rand1.NewSource(time1.Now().UnixNano()))
	p := NewPopulatedA(popr, true)
	jsondata, err := encoding_json.Marshal(p)
	if err != nil {
		panic(err)
	}
	msg := &A{}
	err = encoding_json.Unmarshal(jsondata, msg)
	if err != nil {
		panic(err)
	}
	if err := p.VerboseEqual(msg); err != nil {
		t.Fatalf("%#v !VerboseProto %#v, since %v", msg, p, err)
	}
	if !p.Equal(msg) {
		t.Fatalf("%#v !Json Equal %#v", msg, p)
	}
}

func TestAProtoText(t *testing2.T) {
	popr := math_rand2.New(math_rand2.NewSource(time2.Now().UnixNano()))
	p := NewPopulatedA(popr, true)
	dAtA := github_com_gogo_protobuf_proto1.MarshalTextString(p)
	msg := &A{}
	if err := github_com_gogo_protobuf_proto1.UnmarshalText(dAtA, msg); err != nil {
		panic(err)
	}
	if err := p.VerboseEqual(msg); err != nil {
		t.Fatalf("%#v !VerboseProto %#v, since %v", msg, p, err)
	}
	if !p.Equal(msg) {
		t.Fatalf("%#v !Proto %#v", msg, p)
	}
}

func TestAProtoCompactText(t *testing2.T) {
	popr := math_rand2.New(math_rand2.NewSource(time2.Now().UnixNano()))
	p := NewPopulatedA(popr, true)
	dAtA := github_com_gogo_protobuf_proto1.CompactTextString(p)
	msg := &A{}
	if err := github_com_gogo_protobuf_proto1.UnmarshalText(dAtA, msg); err != nil {
		panic(err)
	}
	if err := p.VerboseEqual(msg); err != nil {
		t.Fatalf("%#v !VerboseProto %#v, since %v", msg, p, err)
	}
	if !p.Equal(msg) {
		t.Fatalf("%#v !Proto %#v", msg, p)
	}
}

Other registered tests are also generated. Tests are registered to this test plugin by calling the following function.

func RegisterTestPlugin(newFunc NewTestPlugin)

where NewTestPlugin is:

type NewTestPlugin func(g *generator.Generator) TestPlugin

and TestPlugin is an interface:

  type TestPlugin interface {
	Generate(imports generator.PluginImports, file *generator.FileDescriptor) (used bool)
  }

Plugins that use this interface include:

- populate
- gostring
- equal
- union
- and more

Please look at these plugins as examples of how to create your own. A good idea is to let each plugin generate its own tests.

Index ▾

Package files

testgen.go