generateStudentId(); $year = date('y'); $this->assertStringStartsWith('STU' . $year, $schoolId); $this->assertSame(10, strlen($schoolId)); } public function test_generates_user_school_id_with_prefix(): void { $service = app(SchoolIdGenerationService::class); $schoolId = $service->generateUserId(); $year = date('y'); $this->assertStringStartsWith($year, $schoolId); $this->assertSame(7, strlen($schoolId)); } }