Grails 中都可以拿 DomainUnitTest 做什么测试？

请参考这篇 文章1 和 文章2

可以用 Domain Unit Test 来模拟领域类的 save()、查询等功能

示例代码：

package demo

class Person {
    String firstName
    String lastName
}

/////////////////// src/test/groovy/demo/PersonSpec.groovy
package demo

import grails.testing.gorm.DomainUnitTest
import spock.lang.Shared
import spock.lang.Specification
import spock.lang.Stepwise

@Stepwise
class PersonSpec extends Specification implements DomainUnitTest<Person> {

    @Shared int id

    void "test basic persistence mocking"() {
        setup:
        new Person(firstName: 'Robert', lastName: 'Fripp').save()
        new Person(firstName: 'Adrian', lastName: 'Belew').save()

        expect:
        Person.count() == 2
    }

    void "test domain instance"() {
        setup:
        id = System.identityHashCode(domain)

        expect:
        domain != null
        domain.hashCode() == id

        when:
        domain.firstName = 'Robert'

        then:
        domain.firstName == 'Robert'
    }

    void "test we get a new domain"() {
        expect:
        domain != null
        domain.firstName == null
        System.identityHashCode(domain) != id
    }
}

如果要对多个领域类测试，可以使用 grails.testing.gorm.DataTest traits，注意，需要显示调用 mockDomain or mockDomains 方法，设置要模拟的Domain类，如下：

package demo

import grails.testing.gorm.DataTest
import spock.lang.Specification

class DataTestTraitSpec extends Specification implements DataTest {

    void setupSpec() {
        mockDomain Person

        // for multiple domains, call mockDomains...
        // mockDomains Person, Address, Company
    }

    void "test basic persistence mocking"() {
        setup:
        new Person(firstName: 'Robert', lastName: 'Fripp').save()
        new Person(firstName: 'Adrian', lastName: 'Belew').save()

        expect:
        Person.count() == 2
    }
}

也可以通过重载Class[] getDomainClassesToMock() method来指定 mock domain classes：

package demo

import grails.testing.gorm.DataTest
import spock.lang.Specification

class GetDomainClassesToMockMethodSpec extends Specification implements DataTest {

    Class[] getDomainClassesToMock() {
        Person
    }

    void "test basic persistence mocking"() {
        setup:
        new Person(firstName: 'Robert', lastName: 'Fripp').save()
        new Person(firstName: 'Adrian', lastName: 'Belew').save()

        expect:
        Person.count() == 2
    }
}

可以用 HibernateSpec 来测试 domain class 的 constraints 是否满足设计要求

如唯一约束、格式约束、非空约束是否满足设计要求；还可以验证错误消息是否提示正确。

示例代码如下，注意继承了 HibernateSpec 而不是 DomainUnitTest：

import grails.test.hibernate.HibernateSpec

@SuppressWarnings('MethodName')
class HotelEmailUniqueConstraintSpec extends HibernateSpec {

    List<Class> getDomainClasses() { [Hotel] }

    def "hotel's email unique constraint"() {

        when: 'You instantiate a hotel with name and an email address which has been never used before'
        def hotel = new Hotel(name: 'Hotel Transilvania', email: '[email protected]')

        then: 'hotel is valid instance'
        hotel.validate()

        and: 'we can save it, and we get back a not null GORM Entity'
        hotel.save()

        and: 'there is one additional Hotel'
        Hotel.count() == old(Hotel.count()) + 1

        when: 'instanting a different hotel with the same email address'
        def hilton = new Hotel(name: 'Hilton Hotel', email: '[email protected]')

        then: 'the hotel instance is not valid'
        !hilton.validate(['email'])

        and: 'unique error code is populated'
        hilton.errors['email']?.code == 'unique'

        and: 'trying to save fails too'
        !hilton.save()

        and: 'no hotel has been added'
        Hotel.count() == old(Hotel.count())
    }
}