带有派生属性的域类的Grails3单元测试 [英] Grails3 unit test for domain class with derived property

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问题描述

我有衍生财产 lowercaseTag

  class Hashtag {
String tag
字符串小写标记标记

静态映射= {
lowercaseTag公式:'lower(tag)'
}
}

如果我运行以下单元测试,它将在最后一行失败,因为 lowercaseTag 属性是 null ,默认情况下,所有属性都有 nullable:false 约束。

  @TestFor(Hashtag)
class HashtagSpec extends Specification {
voidTest that hashtag can be null(){
when :'hashtag为空'
def p = new Hashtag(tag:null)

then:'validation should fail'
!p.validate()

在:'hashtag不为空'时
p = new Hashtag(tag:'notNullHashtag')

then:'validation should pass'
p.validate()
}
}

问题是如何在这种情况下正确编写单元测试?感谢!

解决方案

正如我确信你已经发现, lowercaseTag 不能被测试,因为它依赖于数据库; Grails单元测试不使用数据库,因此公式/表达式不被评估。我认为最好的选择是修改约束,使得 lowercaseTag 可以为空。

  class Hashtag {
字符串标记
字符串小写标记

静态映射= {
lowercaseTag公式:'lower(tag)'
}

静态约束= {
lowercaseTag可空:true
}
}

否则,您必须修改测试以强制 lowercaseTag 包含一些值,以便 validate()可以工作。

  p = new Hashtag(tag:'notNullHashtag',lowercaseTag:'foo')


I have the following Domain class with derived property lowercaseTag.

class Hashtag {
    String tag
    String lowercaseTag

    static mapping = {
        lowercaseTag formula: 'lower(tag)'
    }
}

If I run the following unit test, it will fail on the last line, because lowercaseTag property is null and by default all properties have nullable: false constraint.

@TestFor(Hashtag)
class HashtagSpec extends Specification {
    void "Test that hashtag can not be null"() {
        when: 'the hashtag is null'
        def p = new Hashtag(tag: null)

        then: 'validation should fail'
        !p.validate()

        when: 'the hashtag is not null'
        p = new Hashtag(tag: 'notNullHashtag')

        then: 'validation should pass'
        p.validate()
    }
}

The question is how to properly write unit tests in such cases? Thanks!

解决方案

As I'm sure you've figured out, the lowercaseTag cannot be tested because it's database dependent; Grails unit tests do not use a database, so the formula/expression is not evaluated.

I think the best option is to modify the constraints so that lowercaseTag is nullable.

class Hashtag {
    String tag
    String lowercaseTag

    static mapping = {
        lowercaseTag formula: 'lower(tag)'
    }

    static constraints = {
        lowercaseTag nullable: true
    }
}

Otherwise, you'll have to modify the test to force lowercaseTag to contain some value so that validate() works.

p = new Hashtag(tag: 'notNullHashtag', lowercaseTag: 'foo')

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