fix: resolve a bug in NewCredentials

Generator PR: openfga/sdk-generator#237

api_open_fga_test.go

@@ -225,6 +225,44 @@ func TestOpenFgaApiConfiguration(t *testing.T) {
 		}
 	})
 
+	t.Run("NewCredentials should validate properly", func(t *testing.T) {
+		// Passing valid credentials to NewCredentials should not error
+		creds, err := credentials.NewCredentials(credentials.Credentials{
+			Method: credentials.CredentialsMethodApiToken,
+			Config: &credentials.Config{
+				ApiToken: "some-token",
+			},
+		})
+
+		if err != nil {
+			t.Fatalf("Unexpected error: %v", err)
+		}
+
+		if creds == nil {
+			t.Fatalf("Expected creds to be non-nil")
+		}
+
+		if creds.Method != credentials.CredentialsMethodApiToken {
+			t.Fatalf("Expected method to be %v, got %v", credentials.CredentialsMethodApiToken, creds.Method)
+		}
+
+		if creds.Config.ApiToken != "some-token" {
+			t.Fatalf("Expected ApiToken to be %v, got %v", "some-token", creds.Config.ApiToken)
+		}
+
+		// Passing invalid credentials to NewCredentials should error
+		_, err = credentials.NewCredentials(credentials.Credentials{
+			Method: credentials.CredentialsMethodApiToken,
+			Config: &credentials.Config{
+				ClientCredentialsClientSecret: "some-secret",
+			},
+		})
+
+		if err == nil {
+			t.Fatalf("Expected validation error")
+		}
+	})
+
 	t.Run("should issue a network call to get the token at the first request if client id is provided", func(t *testing.T) {
 		configuration, err := NewConfiguration(Configuration{
 			ApiHost: "api.fga.example",

credentials/credentials.go

@@ -12,7 +12,7 @@ import (
 const ApiTokenHeaderKey = "Authorization"
 const ApiTokenHeaderValuePrefix = "Bearer"
 
-// Avaialable credential methods
+// Available credential methods
 type CredentialsMethod string
 
 const (
@@ -60,10 +60,10 @@ func NewCredentials(config Credentials) (*Credentials, error) {
 	err := creds.ValidateCredentialsConfig()
 
 	if err != nil {
-		return creds, nil
+		return nil, err
 	}
 
-	return nil, err
+	return creds, nil
 }
 
 func (c *Credentials) ValidateCredentialsConfig() error {