diff --git a/google/google.go b/google/google.go
index a7cc83b..e247491 100644
--- a/google/google.go
+++ b/google/google.go
@@ -9,13 +9,13 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"golang.org/x/oauth2/google/internal/externalaccount"
 	"net/url"
 	"strings"
 	"time"
 
 	"cloud.google.com/go/compute/metadata"
 	"golang.org/x/oauth2"
+	"golang.org/x/oauth2/google/internal/externalaccount"
 	"golang.org/x/oauth2/jwt"
 )
 
diff --git a/google/internal/externalaccount/basecredentials_test.go b/google/internal/externalaccount/basecredentials_test.go
index b7c143f..7ec12e4 100644
--- a/google/internal/externalaccount/basecredentials_test.go
+++ b/google/internal/externalaccount/basecredentials_test.go
@@ -39,7 +39,7 @@ var (
 	testNow = func() time.Time { return time.Unix(expiry, 0) }
 )
 
-func TestToken_Func(t *testing.T) {
+func TestToken(t *testing.T) {
 
 	targetServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if got, want := r.URL.String(), "/"; got != want {
diff --git a/google/internal/externalaccount/filecredsource.go b/google/internal/externalaccount/filecredsource.go
index 9d895a0..e953ddb 100644
--- a/google/internal/externalaccount/filecredsource.go
+++ b/google/internal/externalaccount/filecredsource.go
@@ -30,7 +30,6 @@ func (cs fileCredentialSource) subjectToken() (string, error) {
 		return "", fmt.Errorf("oauth2/google: failed to read credential file: %v", err)
 	}
 	tokenBytes = bytes.TrimSpace(tokenBytes)
-	var output string
 	switch cs.Format.Type {
 	case "json":
 		jsonData := make(map[string]interface{})
@@ -46,15 +45,13 @@ func (cs fileCredentialSource) subjectToken() (string, error) {
 		if !ok {
 			return "", errors.New("oauth2/google: improperly formatted subject token")
 		}
-		output = token
+		return token, nil
 	case "text":
-		output = string(tokenBytes)
+		return string(tokenBytes), nil
 	case "":
-		output = string(tokenBytes)
+		return string(tokenBytes), nil
 	default:
 		return "", errors.New("oauth2/google: invalid credential_source file format type")
 	}
 
-	return output, nil
-
 }