diff --git a/.gitignore b/.gitignore
index f6d2d428..a3678b33 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,3 +24,5 @@ go.work.sum
 kubeconfig
 
 release
+
+bin/
diff --git a/driver/helpers.go b/driver/helpers.go
index bccec8cc..7f090c71 100644
--- a/driver/helpers.go
+++ b/driver/helpers.go
@@ -1,7 +1,6 @@
 package driver
 
 import (
-	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -112,23 +111,23 @@ func getNewVolumeSize(capacityRange *csi.CapacityRange) (int64, error) {
 	}
 
 	if requiredSet && limitSet && limitBytes < requiredBytes {
-		return 0, errors.New("limit size is less than required size")
+		return 0, errLimitLessThanRequiredBytes
 	}
 
 	if requiredSet && !limitSet && requiredBytes < MinimalVolumeSizeBytes {
-		return 0, errors.New("required size is less than the minimun size")
+		return 0, errRequiredBytesLessThanMinimun
 	}
 
 	if limitSet && limitBytes < MinimalVolumeSizeBytes {
-		return 0, errors.New("limit size is less than the minimun size")
+		return 0, errLimitLessThanMinimum
 	}
 
 	if requiredSet && requiredBytes > MaximumVolumeSizeBytes {
-		return 0, errors.New("required size is greater than the maximum size")
+		return 0, errRequiredBytesGreaterThanMaximun
 	}
 
 	if !requiredSet && limitSet && limitBytes > MaximumVolumeSizeBytes {
-		return 0, errors.New("limit size is greater than the maximum size")
+		return 0, errLimitGreaterThanMaximum
 	}
 
 	if requiredSet && limitSet && requiredBytes == limitBytes {
diff --git a/go.mod b/go.mod
index 25807dab..d3d0ba79 100644
--- a/go.mod
+++ b/go.mod
@@ -6,6 +6,7 @@ require (
 	github.com/container-storage-interface/spec v1.8.0
 	github.com/exoscale/egoscale v0.102.4-0.20240117105256-1ace995a320f
 	github.com/golang/protobuf v1.5.3
+	github.com/stretchr/testify v1.8.2
 	golang.org/x/sys v0.15.0
 	google.golang.org/grpc v1.58.0
 	google.golang.org/protobuf v1.31.0
@@ -39,6 +40,7 @@ require (
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	golang.org/x/crypto v0.17.0 // indirect
 	golang.org/x/net v0.13.0 // indirect
 	golang.org/x/oauth2 v0.10.0 // indirect
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 2de17323..17280be0 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -96,6 +96,13 @@ github.com/modern-go/reflect2
 # github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822
 ## explicit
 github.com/munnerz/goautoneg
+# github.com/pmezard/go-difflib v1.0.0
+## explicit
+github.com/pmezard/go-difflib/difflib
+# github.com/stretchr/testify v1.8.2
+## explicit; go 1.13
+github.com/stretchr/testify/assert
+github.com/stretchr/testify/require
 # golang.org/x/crypto v0.17.0
 ## explicit; go 1.18
 golang.org/x/crypto/sha3