package testservice

import grails.compiler.GrailsCompileStatic

@GrailsCompileStatic
class Student {

    String name
    BigDecimal grade
    Classroom classroom

   static constraints = {
        classroom nullable: true
   }
}

package testservice

import grails.gorm.transactions.Transactional

@Transactional(readOnly = true)
class StudentService {
//   返回grade大于传入值的数据
   List<Student> findStudentsWithGradeAbove(BigDecimal grade) {
        Student.findAllByGradeGreaterThanEquals(grade)
   }
// 返回所有的数据
   def finbyAll(){
        Student.list()
   }
}

package testservice

import grails.testing.services.ServiceUnitTest

import grails.test.hibernate.HibernateSpec

@SuppressWarnings(['MethodName', 'DuplicateNumberLiteral'])

//grails框架自动生成的测试类继承的是Specification类，需要将之替换为HibernateSpec

class StudentServiceSpec extends HibernateSpec implements ServiceUnitTest<StudentService> {

    List<Class> getDomainClasses() { [Student] } // <1>
   def 'test find students with grades above'() {
       when: 'students are already stored in db'
//    先添加三条数据
Student.saveAll(
               new Student(name: 'Nirav', grade: 91),
               new Student(name: 'Sergio', grade: 95),
               new Student(name: 'Jeff', grade: 93),
       )
//  then 后跟的为测试的内容
       then:
Student.count() == 3

       when: 'service is called to search'
//    内置的service对象调用 findStudentsWithGradeAbove() 方法
List<Student> students = service.findStudentsWithGradeAbove(92)

       then: 'students are found with appropriate grades'
        students.size() == 2
        students[0].name == 'Sergio'
        students[0].grade == 95
        students[1].name == 'Jeff'
        students[1].grade == 93
   }

   def 'test fin by all'() {
       when:
        Student.saveAll(
               new Student(name: 'Nirav', grade: 91),
               new Student(name: 'Sergio', grade: 95),
               new Student(name: 'Jeff', grade: 93),
       )

       then:
        Student.count() == 3

       when:
       def list = service.finbyAll()

       then:
        list.size() == 3
   }
}