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POHow to unit test grails domain class that has a relational mapping?
 

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    <p>The output of my test gives <code>com.example.book.Book : null</code>. When I debug the test, <code>b</code> object is created with <code>"MyBook"</code> as its <code>name</code>. But since its has a static mapping <code>belongsTo</code>, the test fails. How do I make this work. When I comment the <code>belongsTo</code> mapping in the Books.groovy, the test passes. So how do I test Domain classes with mappings. Should I instantiate a <code>Library</code> object and add a <code>Book</code> 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?</p> <p>Below is my code.</p> <p>Domains:</p> <pre><code>//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 } </code></pre> <p>Unit tests: </p> <pre><code>//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() } } </code></pre> <p>Test Output:</p> <pre><code>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) </code></pre> <p>Thanks.</p>
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