如何单元测试具有关系映射的grails域类? [英] How to unit test grails domain class that has a relational mapping?

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问题描述

我的测试结果给出 com.example.book.Book:null 。当我调试测试时,使用MyBook创建 b 对象作为其名称。但是因为它有一个静态映射 belongsTo ,所以测试失败。我如何完成这项工作。当我评论Books.groovy中的 belongsTo 映射时,测试通过。那么,我如何测试带映射的域类。我应该实例化一个 Library 对象并向它添加一个 Book 对象吗?但是,这并不能单独测试域类,因为它是为了进行单元测试,是吗?



以下是我的代码。



域名:

  // Book.groovy 
package com.example .book

class Book {
static constraint = {
name blank:false,size:2..255,unique:true
}
static belongsTo = [lib:Library]
字符串名称
}

//Library.groovy
包com.example.library

类库{
static hasMany = [book:Book,branch:user:User]
static constraints = {
name blank:false
place blank:false
}
字符串名称
字符串位置
}

单元测试: p>

  // BookUnitTests.groovy 
包com.example.book

导入grails.test。 *

类BookUnitTests扩展GrailsUnitTestCase {
保护无效setUp(){
super.setUp()
mockForConstraintsTests(Book)
}

protected void tearDown(){
super.tearDown()
}

void testPass(){
def b = new Book(name:MyBook)
assert b.validate()
}
}

测试结果:

 失败:testPass(com.example.book.BookUnitTests)
|断言失败:

断言b.validate()
| |
| false
com.example.book.Book:null

at com.example.book.BookUnitTests.testPass(BookUnitTests.groovy:17)

谢谢。

解决方案

如果没有图书馆,这本书不能存在。您将不得不创建一个库并将其分配给它。

使用 belongsTo 是否合理取决于您的要求。你是否真的需要保存图书馆,并保存所有书籍?


The output of my test gives com.example.book.Book : null. When I debug the test, b object is created with "MyBook" as its name. But since its has a static mapping belongsTo, the test fails. How do I make this work. When I comment the belongsTo mapping in the Books.groovy, the test passes. So how do I test Domain classes with mappings. Should I instantiate a Library object and add a Book object to it? But that doesn't make testing the domain class in isolation as it is meant to be in a unit test, does it?

Below is my code.

Domains:

//Book.groovy
package com.example.book

class Book {
    static constraint = {
        name blank: false, size: 2..255, unique: true
    }
    static belongsTo = [lib: Library]
    String name
}

//Library.groovy
package com.example.library

class Library {
    static hasMany = [book: Book, branch: user: User]
    static constraints = {
        name blank: false
        place blank: false
    }
    String name
    String place
}

Unit tests:

//BookUnitTests.groovy
package com.example.book

import grails.test.*

class BookUnitTests extends GrailsUnitTestCase {
    protected void setUp() {
        super.setUp()
        mockForConstraintsTests(Book)
    }

    protected void tearDown() {
        super.tearDown()
    }

    void testPass() {
        def b = new Book(name: "MyBook")
        assert b.validate()
    }
}

Test Output:

Failure:  testPass(com.example.book.BookUnitTests)
|  Assertion failed: 

assert b.validate()
       | |
       | false
       com.example.book.Book : null

       at com.example.book.BookUnitTests.testPass(BookUnitTests.groovy:17)

Thanks.

解决方案

Yes, the way you have this set up the Book cannot exist without a Library. You will have to create a Library and assign the book to it.

Whether using belongsTo makes sense depends on your requirements. Do you really need to save the library and have all the books get saved as a result?

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