Add test of mockgen for embed option

mockgen/internal/tests/embed/input.go

@@ -0,0 +1,17 @@
+package embed
+
+//go:generate mockgen -embed -package embed -destination mock.go . Hoge
+//go:generate mockgen -embed -destination mock/mock.go . Hoge
+
+type Hoge interface {
+	Fuga() error
+	mustImplementedFunction()
+}
+
+type HogeImpl struct {
+	s string
+}
+
+func (h *HogeImpl) Fuga() error {
+	return nil
+}

mockgen/internal/tests/embed/mock/mock_test.go

@@ -0,0 +1,19 @@
+package mock_embed_test
+
+import (
+	reflect "reflect"
+	"testing"
+
+	"github.com/golang/mock/gomock"
+	"github.com/golang/mock/mockgen/internal/tests/embed"
+	mock_embed "github.com/golang/mock/mockgen/internal/tests/embed/mock"
+)
+
+func TestEmbed(t *testing.T) {
+	hoge := mock_embed.NewMockHoge(gomock.NewController(t))
+	et := reflect.TypeOf((*embed.Hoge)(nil)).Elem()
+	ht := reflect.TypeOf(hoge)
+	if !ht.Implements(et) {
+		t.Errorf("source interface has been not implemented")
+	}
+}

mockgen/internal/tests/embed/mock_test.go

@@ -0,0 +1,18 @@
+package embed_test
+
+import (
+	reflect "reflect"
+	"testing"
+
+	"github.com/golang/mock/gomock"
+	"github.com/golang/mock/mockgen/internal/tests/embed"
+)
+
+func TestEmbed(t *testing.T) {
+	hoge := embed.NewMockHoge(gomock.NewController(t))
+	et := reflect.TypeOf((*embed.Hoge)(nil)).Elem()
+	ht := reflect.TypeOf(hoge)
+	if !ht.Implements(et) {
+		t.Errorf("source interface has been not implemented")
+	}
+}