diff --git a/gen/rpc_test.go b/gen/rpc_test.go
new file mode 100644
index 0000000..1bac1e6
--- /dev/null
+++ b/gen/rpc_test.go
@@ -0,0 +1,229 @@
+package gen
+
+import (
+	"bufio"
+	"bytes"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestBuildRpc(t *testing.T) {
+	const (
+		testPk = "test"
+		testGo = testPk + ".go"
+	)
+	var (
+		testDir  = filepath.Join("testdata", "rpc")
+		testFile = testGo
+		genFile  = testPk + "." + strings.ReplaceAll(t.Name(), "/", "_") + ".go"
+	)
+	pwd, err := os.Getwd()
+	if err != nil {
+		t.Errorf("getwd: %s", err)
+		return
+	}
+	defer func() {
+		if err = os.Chdir(pwd); err != nil {
+			t.Errorf("chdir: %s", err)
+			return
+		}
+	}()
+	if err = os.Chdir(testDir); err != nil {
+		t.Errorf("chdir: %s", err)
+		return
+	}
+	newBuilder := func(t *testing.T) (*CliBuilder, bool) {
+		doc, err := os.ReadFile(testFile)
+		if err != nil {
+			t.Errorf("build: error reading %s file => %s", testGo, err)
+			return nil, false
+		}
+		var pos int
+		lineScanner := bufio.NewScanner(bytes.NewReader(doc))
+		for i := 1; lineScanner.Scan(); i++ {
+			text := lineScanner.Text()
+			if strings.HasPrefix(text, "//go:generate") &&
+				strings.HasSuffix(text, t.Name()) {
+				pos = i
+				break
+			}
+		}
+		if err = lineScanner.Err(); err != nil {
+			t.Errorf("build: error scanning %s lines => %s", testGo, err)
+			return nil, false
+		}
+		if pos == 0 {
+			t.Errorf("build: unable to get pos in %s", testGo)
+			return nil, false
+		}
+		testDirAbs, err := os.Getwd()
+		if err != nil {
+			t.Errorf("getwd: %s", err)
+			return nil, false
+		}
+		return NewCliBuilder(ModeRpc).
+			WithPkg(testPk).
+			WithPwd(testDirAbs).
+			WithFile(testGo, doc).
+			WithPos(pos), true
+	}
+	t.Run("success", func(t *testing.T) {
+		builder, ok := newBuilder(t)
+		if !ok {
+			return
+		}
+		if err := runTest(genFile, builder); err != nil {
+			t.Errorf("build: %s", err)
+			return
+		}
+	})
+	t.Run("success_pointer_reply", func(t *testing.T) {
+		builder, ok := newBuilder(t)
+		if !ok {
+			return
+		}
+		if err := runTest(genFile, builder); err != nil {
+			t.Errorf("build: %s", err)
+			return
+		}
+	})
+	t.Run("fail_no_input", func(t *testing.T) {
+		builder, ok := newBuilder(t)
+		if !ok {
+			return
+		}
+		if err := runTest(genFile, builder); err == nil {
+			t.Errorf("build: expects errors, got nil")
+			return
+		} else if !strings.Contains(err.Error(),
+			"should have exactly 1 input parameter") {
+			t.Errorf("build: expects NoInput error, got => %s", err)
+			return
+		}
+	})
+	t.Run("fail_too_many_inputs", func(t *testing.T) {
+		builder, ok := newBuilder(t)
+		if !ok {
+			return
+		}
+		if err := runTest(genFile, builder); err == nil {
+			t.Errorf("build: expects errors, got nil")
+			return
+		} else if !strings.Contains(err.Error(),
+			"should have exactly 1 input parameter") {
+			t.Errorf("build: expects TooManyInputs error, got => %s", err)
+			return
+		}
+	})
+	t.Run("fail_no_output", func(t *testing.T) {
+		builder, ok := newBuilder(t)
+		if !ok {
+			return
+		}
+		if err := runTest(genFile, builder); err == nil {
+			t.Errorf("build: expects errors, got nil")
+			return
+		} else if !strings.Contains(err.Error(),
+			"should have exactly 2 output parameters") {
+			t.Errorf("build: expects NoOutput error, got => %s", err)
+			return
+		}
+	})
+	t.Run("fail_one_output", func(t *testing.T) {
+		builder, ok := newBuilder(t)
+		if !ok {
+			return
+		}
+		if err := runTest(genFile, builder); err == nil {
+			t.Errorf("build: expects errors, got nil")
+			return
+		} else if !strings.Contains(err.Error(),
+			"should have exactly 2 output parameters") {
+			t.Errorf("build: expects OneOutput error, got => %s", err)
+			return
+		}
+	})
+	t.Run("fail_too_many_outputs", func(t *testing.T) {
+		builder, ok := newBuilder(t)
+		if !ok {
+			return
+		}
+		if err := runTest(genFile, builder); err == nil {
+			t.Errorf("build: expects errors, got nil")
+			return
+		} else if !strings.Contains(err.Error(),
+			"should have exactly 2 output parameters") {
+			t.Errorf("build: expects TooManyOutputs error, got => %s", err)
+			return
+		}
+	})
+	t.Run("fail_no_error", func(t *testing.T) {
+		builder, ok := newBuilder(t)
+		if !ok {
+			return
+		}
+		if err := runTest(genFile, builder); err == nil {
+			t.Errorf("build: expects errors, got nil")
+			return
+		} else if !strings.Contains(err.Error(),
+			"should have an error as the second output parameter") {
+			t.Errorf("build: expects NoError error, got => %s", err)
+			return
+		}
+	})
+	t.Run("fail_no_name_type", func(t *testing.T) {
+		builder, ok := newBuilder(t)
+		if !ok {
+			return
+		}
+		if err := runTest(genFile, builder); err == nil {
+			t.Errorf("build: expects errors, got nil")
+			return
+		} else if !strings.Contains(err.Error(),
+			"should contain 'Name' and 'Type' both") {
+			t.Errorf("build: expects NoNameType error, got => %s", err)
+			return
+		}
+	})
+	t.Run("fail_no_type_decl", func(t *testing.T) {
+		builder, ok := newBuilder(t)
+		if !ok {
+			return
+		}
+		if err := runTest(genFile, builder); err == nil {
+			t.Errorf("build: expects errors, got nil")
+			return
+		} else if !strings.Contains(err.Error(),
+			"no available 'Interface' type declaration (*ast.GenDecl) found, ") {
+			t.Errorf("build: expects NoTypeDecl error, got => %s", err)
+			return
+		}
+	})
+	t.Run("fail_no_iface_type", func(t *testing.T) {
+		builder, ok := newBuilder(t)
+		if !ok {
+			return
+		}
+		if err := runTest(genFile, builder); err == nil {
+			t.Errorf("build: expects errors, got nil")
+			return
+		} else if !strings.Contains(err.Error(),
+			"no available 'Interface' type declaration (*ast.InterfaceType) found, ") {
+			t.Errorf("build: expects NoIfaceType error, got => %s", err)
+			return
+		}
+	})
+	t.Run("success_nort", func(t *testing.T) {
+		builder, ok := newBuilder(t)
+		if !ok {
+			return
+		}
+		builder = builder.WithFeats([]string{FeatureRpcNoRt})
+		if err := runTest(genFile, builder); err != nil {
+			t.Errorf("build: %s", err)
+			return
+		}
+	})
+}
diff --git a/gen/testdata/rpc/test.go b/gen/testdata/rpc/test.go
new file mode 100644
index 0000000..6c471b8
--- /dev/null
+++ b/gen/testdata/rpc/test.go
@@ -0,0 +1,66 @@
+//go:build !no_test
+// +build !no_test
+
+package test
+
+//go:generate defc [mode] [output] [features...] TestBuildRpc/success
+type Success interface {
+	Multiply(args chan int) (int, error)
+	unexported()
+}
+
+//go:generate defc [mode] [output] [features...] TestBuildRpc/success_pointer_reply
+type SuccessPointerReply interface {
+	GetUser(id int) (*User, error)
+}
+
+type User struct {
+	ID   int
+	Name string
+}
+
+//go:generate defc [mode] [output] [features...] TestBuildRpc/fail_no_input
+type FailNoInput interface {
+	NoInput() (int, error)
+}
+
+//go:generate defc [mode] [output] [features...] TestBuildRpc/fail_too_many_inputs
+type FailTooManyInputs interface {
+	TooManyInputs(a, b int) (int, error)
+}
+
+//go:generate defc [mode] [output] [features...] TestBuildRpc/fail_no_output
+type FailNoOutput interface {
+	NoOutput(a int)
+}
+
+//go:generate defc [mode] [output] [features...] TestBuildRpc/fail_one_output
+type FailOneOutput interface {
+	OneOutput(a int) error
+}
+
+//go:generate defc [mode] [output] [features...] TestBuildRpc/fail_too_many_outputs
+type FailTooManyOutputs interface {
+	TooManyOutputs(a int) (int, int, error)
+}
+
+//go:generate defc [mode] [output] [features...] TestBuildRpc/fail_no_error
+type FailNoError interface {
+	NoError(a int) (int, int)
+}
+
+//go:generate defc [mode] [output] [features...] TestBuildRpc/fail_no_name_type
+type FailNoNameType interface {
+	NoNameType(int) (int, error)
+}
+
+//go:generate defc [mode] [output] [features...] TestBuildRpc/fail_no_type_decl
+var FailNoTypeDecl struct{}
+
+//go:generate defc [mode] [output] [features...] TestBuildRpc/fail_no_iface_type
+type FailNoIfaceType struct{}
+
+//go:generate defc [mode] [output] [features...] TestBuildRpc/success_nort
+type SuccessNoRt interface {
+	Multiply(args chan int) (int, error)
+}
diff --git a/runtime/version.go b/runtime/version.go
index 2ca4b7e..7e4291e 100644
--- a/runtime/version.go
+++ b/runtime/version.go
@@ -1,3 +1,3 @@
 package defc
 
-const Version = "v1.44.4"
+const Version = "v1.44.5"