diff --git a/sample-monorepo/a/go.mod b/sample-monorepo/a/go.mod
new file mode 100644
index 0000000..fa18c99
--- /dev/null
+++ b/sample-monorepo/a/go.mod
@@ -0,0 +1,3 @@
+module github.com/golangci/actiona
+
+go 1.24.0
diff --git a/sample-monorepo/a/sample.go b/sample-monorepo/a/sample.go
new file mode 100644
index 0000000..80504b0
--- /dev/null
+++ b/sample-monorepo/a/sample.go
@@ -0,0 +1,26 @@
+// Package sample is used as test input for golangci action.
+package sample
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"errors"
+)
+
+// Hash~
+func Hash(data string) string {
+	retError()
+	retError2()
+
+	h := md5.New()
+	h.Write([]byte(data))
+	return hex.EncodeToString(h.Sum(nil))
+}
+
+func retError() error {
+	return errors.New("err")
+}
+
+func retError2() error {
+	return errors.New("err2")
+}
diff --git a/sample-monorepo/a/suba/go.mod b/sample-monorepo/a/suba/go.mod
new file mode 100644
index 0000000..2f75be6
--- /dev/null
+++ b/sample-monorepo/a/suba/go.mod
@@ -0,0 +1,3 @@
+module github.com/golangci/actiona/suba
+
+go 1.24.0
diff --git a/sample-monorepo/a/suba/sample.go b/sample-monorepo/a/suba/sample.go
new file mode 100644
index 0000000..80504b0
--- /dev/null
+++ b/sample-monorepo/a/suba/sample.go
@@ -0,0 +1,26 @@
+// Package sample is used as test input for golangci action.
+package sample
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"errors"
+)
+
+// Hash~
+func Hash(data string) string {
+	retError()
+	retError2()
+
+	h := md5.New()
+	h.Write([]byte(data))
+	return hex.EncodeToString(h.Sum(nil))
+}
+
+func retError() error {
+	return errors.New("err")
+}
+
+func retError2() error {
+	return errors.New("err2")
+}
diff --git a/sample-monorepo/b/go.mod b/sample-monorepo/b/go.mod
new file mode 100644
index 0000000..7be68bc
--- /dev/null
+++ b/sample-monorepo/b/go.mod
@@ -0,0 +1,3 @@
+module github.com/golangci/actionb
+
+go 1.24.0
diff --git a/sample-monorepo/b/sample.go b/sample-monorepo/b/sample.go
new file mode 100644
index 0000000..80504b0
--- /dev/null
+++ b/sample-monorepo/b/sample.go
@@ -0,0 +1,26 @@
+// Package sample is used as test input for golangci action.
+package sample
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"errors"
+)
+
+// Hash~
+func Hash(data string) string {
+	retError()
+	retError2()
+
+	h := md5.New()
+	h.Write([]byte(data))
+	return hex.EncodeToString(h.Sum(nil))
+}
+
+func retError() error {
+	return errors.New("err")
+}
+
+func retError2() error {
+	return errors.New("err2")
+}
diff --git a/sample-monorepo/c/go.mod b/sample-monorepo/c/go.mod
new file mode 100644
index 0000000..bfcbddc
--- /dev/null
+++ b/sample-monorepo/c/go.mod
@@ -0,0 +1,3 @@
+module github.com/golangci/actionc
+
+go 1.24.0
diff --git a/sample-monorepo/c/sample.go b/sample-monorepo/c/sample.go
new file mode 100644
index 0000000..80504b0
--- /dev/null
+++ b/sample-monorepo/c/sample.go
@@ -0,0 +1,26 @@
+// Package sample is used as test input for golangci action.
+package sample
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"errors"
+)
+
+// Hash~
+func Hash(data string) string {
+	retError()
+	retError2()
+
+	h := md5.New()
+	h.Write([]byte(data))
+	return hex.EncodeToString(h.Sum(nil))
+}
+
+func retError() error {
+	return errors.New("err")
+}
+
+func retError2() error {
+	return errors.New("err2")
+}