Laravel tests with sqlite doesn't create users table

I'm with problem with tests in Laravel. I don't know why the users table isn't be created, because all other tables are ok.

My PHP Unit configuration file (phpunit.xml)

          <php>
                  <env name="APP_ENV" value="testing"/>
                  <env name="DB_CONNECTION" value="sqlite"/>
                  <env name="DB_DATABASE" value=":memory:"/>
                  <env name="CACHE_DRIVER" value="array"/>
                  <env name="SESSION_DRIVER" value="array"/>
                  <env name="QUEUE_DRIVER" value="sync"/>
              </php>

Users Migration ( create_users_table )

          use Illuminate\Support\Facades\Schema;
          use Illuminate\Database\Schema\Blueprint;
          use Illuminate\Database\Migrations\Migration;

          class CreateUsersTable extends Migration
          {
              /**
               * Run the migrations.
               *
               * @return void
               */
              public function up()
              {
                  Schema::create('user', function (Blueprint $table) {
          
                      $table->increments('id');
                      $table->integer('status')->nullable()->default(1);
                      $table->string('name');
                      $table->string('email')->unique();
                      $table->string('password');
                      $table->string('sysid', 20)->nullable();
                      $table->string('avatar')->nullable();
                      $table->string('cpf', 18)->nullable();
          
                      $table->rememberToken();
                      $table->timestamps();
                  });
              }
          
              /**
               * Reverse the migrations.
               *
               * @return void
               */
              public function down()
              {
                  Schema::dropIfExists('user');
              }
          }

tests/Unit/RoleTest.php

        <?php
        
        namespace Tests\Unit;
        
        use Tests\TestCase;
        use Illuminate\Foundation\Testing\DatabaseMigrations;
        use Illuminate\Foundation\Testing\DatabaseTransactions;
        
        class RoleTest extends TestCase
        {
        
            use DatabaseMigrations;
        
            protected $role;
            protected $permission;
        
        
            public function setUp() {
        
                parent::setUp();
                $this->role = factory('App\Model\ACL\Role')->create();
                $this->permission = factory('App\Model\ACL\Permission')->create();
            }
        
        
            /** @test */
            public function a_role_has_permissions ()
            {
        
                $this->assertInstanceOf(
            'Illuminate\Database\Eloquent\Collection', $this->role->permissions
                );
            }
        
            /** @test */
            public function a_role_gives_permission_to ()
            {
                $permission = $this->role->givePermissionTo($this->permission);
                $this->assertInstanceOf('App\Model\ACL\Permission', $permission);
        
            }
        
        
            /** @test */
            public function a_role_has_permission ()
            {
                $permission = $this->role->givePermissionTo($this->permission);
                $this->assertTrue($this->role->hasPermission($this->permission));
            }
        
        
            /** @test */
            public function a_role_has_many_users ()
            {
                
                $this->assertInstanceOf(
                    'Illuminate\Database\Eloquent\Collection', $this->role->users
                );
        
            }
        }

The tests are given the following errors:

        1) Tests\Unit\RoleTest::a_role_has_many_users
        Illuminate\Database\QueryException: SQLSTATE[HY000]: General error: 1 no such table: users (SQL: select "users".*, "role_user"."role_id" as "pivot_role_id", "role_user"."user_id" as "pivot_user_id" from "users" inner join "role_user" on "users"."id" = "role_user"."user_id" where "role_user"."role_id" = 1)


        Caused by
        PDOException: SQLSTATE[HY000]: General error: 1 no such table: users