scala - 在 ScalaTest 中组合测试装置的更好方法

Question

我们有使用 loan pattern 的测试装置.利用此模式创建运行测试所需的“种子数据”。当测试依赖于数据例如下列的

"save definition" should {
"create a new record" in withSubject { implicit subject =>
  withDataSource { implicit datasource =>
    withFormType { implicit formtype =>

        val definitn = DefinitionModel(-1, datasource.id, formtype.id, subject.role.id, Some(properties))
    }
  }
}

哪里 withSubject , withDataSource , withFormType测试夹具是否返回 subject , dataSource , formType数据分别来自数据库。 withDataSource夹具需要 subject含蓄地。大厦 DefinitionModel需要 datasource.id和 formtype.id .因此，根据调用此类数据生成器固定装置的测试的数据要求，会产生大量嵌套固定装置的情况。有没有更好的方法来“组合”/构建这样的装置？

Answer 1

@Nader Hadji Ghanbari 给出的答案仍然成立。我只想补充一点，自 scalatest 3.x.x 版以来，特征更改了名称。从迁移指南复制:

Mixin traits that override withFixture

4) In 3.0.0, the withFixture method has been moved from Suite to a new trait, TestSuite. This was done to make room for a withFixture method with a different signature in AsyncTestSuite. If you factored out a withFixture method into a separate "suite mixin" trait, you'll need to change "Suite" to "TestSuite" and "SuiteMixin" to "TestSuiteMixin". For example, given this trait from 2.2.6:

trait YourMixinTrait extends SuiteMixin { this: Suite =>
 abstract override def withFixture(test: NoArgTest): Outcome = {
   // ...
 }
}

You will need to add the "Test" prefix, like this:

trait YourMixinTrait extends TestSuiteMixin { this: TestSuite =>
 abstract override def withFixture(test: NoArgTest): Outcome = {
   // ...
 }
}