fix(tests): resolve integration test failures

- Fix database test error message expectation for email uniqueness
  Changed from "duplicate" to "already exists" to match PostgreSQL error
- Fix concurrent task creation test to use proper string formatting
  Replace character conversion with fmt.Sprintf for task names
- Update OpenAPI validator to match AuthResponse structure
  Add missing fields: token_type, expires_in, created_at, updated_at
  Update required fields in both register and login endpoints

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: starbops

tests/integration/database_test.go

@@ -4,6 +4,7 @@ package integration_test
 
 import (
 	"context"
+	"fmt"
 	"testing"
 	"time"
 
@@ -85,7 +86,7 @@ func (s *DatabaseIntegrationSuite) TestUserLifecycle() {
 
 		err = s.DB.Repositories.Users.Create(ctx, user2)
 		assert.Error(s.T(), err)
-		assert.Contains(s.T(), err.Error(), "duplicate") // PostgreSQL constraint error
+		assert.Contains(s.T(), err.Error(), "already exists") // PostgreSQL constraint error
 	})
 }
 
@@ -214,7 +215,7 @@ func (s *DatabaseIntegrationSuite) TestConcurrentAccess() {
 		for i := 0; i < numTasks; i++ {
 			go func(index int) {
 				task := testutil.NewTaskFactory(user.ID).
-					WithName("Concurrent Task " + string(rune(index))).
+					WithName(fmt.Sprintf("Concurrent Task %d", index)).
 					Build()
 
 				err := s.DB.Repositories.Tasks.Create(ctx, task)

tests/testutil/openapi_validator.go

@@ -89,16 +89,20 @@ func loadOpenAPISpec() *OpenAPISpec {
 											"user": {
 												Type: "object",
 												Properties: map[string]*SchemaSpec{
-													"id":    {Type: "string"},
-													"email": {Type: "string"},
-													"name":  {Type: "string"},
+													"id":         {Type: "string"},
+													"email":      {Type: "string"},
+													"name":       {Type: "string"},
+													"created_at": {Type: "string"},
+													"updated_at": {Type: "string"},
 												},
-												Required: []string{"id", "email", "name"},
+												Required: []string{"id", "email", "name", "created_at", "updated_at"},
 											},
 											"access_token":  {Type: "string"},
 											"refresh_token": {Type: "string"},
+											"token_type":    {Type: "string"},
+											"expires_in":    {Type: "integer"},
 										},
-										Required: []string{"user", "access_token", "refresh_token"},
+										Required: []string{"user", "access_token", "refresh_token", "token_type", "expires_in"},
 									},
 								},
 							},
@@ -137,16 +141,20 @@ func loadOpenAPISpec() *OpenAPISpec {
 											"user": {
 												Type: "object",
 												Properties: map[string]*SchemaSpec{
-													"id":    {Type: "string"},
-													"email": {Type: "string"},
-													"name":  {Type: "string"},
+													"id":         {Type: "string"},
+													"email":      {Type: "string"},
+													"name":       {Type: "string"},
+													"created_at": {Type: "string"},
+													"updated_at": {Type: "string"},
 												},
-												Required: []string{"id", "email", "name"},
+												Required: []string{"id", "email", "name", "created_at", "updated_at"},
 											},
 											"access_token":  {Type: "string"},
 											"refresh_token": {Type: "string"},
+											"token_type":    {Type: "string"},
+											"expires_in":    {Type: "integer"},
 										},
-										Required: []string{"user", "access_token", "refresh_token"},
+										Required: []string{"user", "access_token", "refresh_token", "token_type", "expires_in"},
 									},
 								},
 							},