diff --git a/go.mod b/go.mod
index 02cc173..095602b 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,11 @@
 module gitea.urkob.com/urko/go-root-dir
 
 go 1.19
+
+require github.com/stretchr/testify v1.8.2
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..6a56e69
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,17 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/stretchr/testify v1.8.2 h1:+h33VjcLVPDHtOdpUCuF+7gSuG3yGIftsP1YvFihtJ8=
+github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/main.go b/main.go
index 5f6dd24..7d9ba38 100644
--- a/main.go
+++ b/main.go
@@ -1,18 +1,20 @@
 package main
 
 import (
-	"log"
-	"os/exec"
-	"strings"
+	"os"
+	"regexp"
 )
 
-func RootDir() string {
-	cmdOut, err := exec.Command("git", "rev-parse", "--show-toplevel").Output()
-	if err != nil {
-		log.Fatalf("exec.Command: %s", err)
+func RootDir(projectDirName string) string {
+	if projectDirName == "" {
 		return ""
 	}
 
-	rootDir := strings.TrimSpace(string(cmdOut))
-	return rootDir
+	projectName := regexp.MustCompile(`^(.*` + projectDirName + `)`)
+	currentWorkDirectory, _ := os.Getwd()
+	rootPath := projectName.Find([]byte(currentWorkDirectory))
+	if len(rootPath) <= 0 {
+		return ""
+	}
+	return string(rootPath)
 }
diff --git a/main_test.go b/main_test.go
new file mode 100644
index 0000000..d800d66
--- /dev/null
+++ b/main_test.go
@@ -0,0 +1,20 @@
+package main
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestRootDir(t *testing.T) {
+	projectDirName := "go-root-dir"
+	dir := RootDir(projectDirName)
+	require.NotEmpty(t, dir)
+	require.Equal(t, strings.Split(dir, "/")[len(strings.Split(dir, "/"))-1], projectDirName)
+}
+
+func TestRootDirError(t *testing.T) {
+	require.Empty(t, RootDir(""))
+	require.Empty(t, RootDir("aaa"))
+}