ScalaMock和蛋糕模式-为什么我的存根没有被调用？
ScalaMock和蛋糕模式-为什么我的存根没有被调用？
提问于 2017-07-12 14:01:08
我有一个Scala应用程序，它使用Cake模式：
trait RepositoryComponent {
def repository: Repository
trait Repository {
def shouldSave(record: GenericRecord): Boolean
def findRecord(keys: Array[String]): Long
def insertRecord(record: GenericRecord)
def updateRecord(keys: Array[String], record: GenericRecord)
def cleanUp()
}
}
trait DbRepositoryComponent extends RepositoryComponent with Logged {
val connection: Connection
val subscription: Subscription
val schema: Schema
def repository = new DbRepository(connection, subscription, schema)
class DbRepository(connection: Connection, subscription: Subscription, schema: Schema) extends Repository {
...
}
trait ConsumerComponent {
def consumer: Consumer
trait Consumer {
def write(keys: Array[String], record: GenericRecord)
def close()
}
}
trait DbReplicatorComponent extends ConsumerComponent with Logged {
this: RepositoryComponent =>
def consumer = new DatabaseReplicator()
class DatabaseReplicator extends Consumer {
...
}当我天真地开始测试consumer.write的实现时，我尝试了这样的方法(使用ScalaMock)：
class DbReplicatorComponentTests extends FunSuite with MockFactory {
private val schema = new Schema.Parser().parse(getClass.getResourceAsStream("/AuditRecord.avsc"))
private val record = new GenericRecordBuilder(schema)
.set("id1", 123)
.set("id2", "foo")
.set("text", "blergh")
.set("audit_fg", "I")
.set("audit_ts", 1498770000L)
.build()
test("A record should be inserted if the audit flag is 'I' and no existing record is found") {
val replicator = new DbReplicatorComponent with RepositoryComponent {
override def repository: Repository = stub[Repository]
}
(replicator.repository.shouldSave _).when(record).returns(true)
(replicator.repository.findRecord _).when(Array("123", "foo")).returns(0L)
replicator.consumer.write(Array("123", "foo"), record)
(replicator.repository.insertRecord _).verify(record)
}
}测试失败是因为我没有坚持实际的实现：
Unsatisfied expectation:
Expected:
inAnyOrder {
<stub-1> Repository.shouldSave({"id1": 123, "id2": "foo", "text": "blergh", "audit_fg": "I", "audit_ts": 1498770000}) any number of times (never called)
<stub-2> Repository.findRecord([Ljava.lang.String;@4b8ee4de) any number of times (never called)
<stub-4> Repository.insertRecord({"id1": 123, "id2": "foo", "text": "blergh", "audit_fg": "I", "audit_ts": 1498770000}) once (never called - UNSATISFIED)
}
Actual:
<stub-3> Repository.shouldSave({"id1": 123, "id2": "foo", "text": "blergh", "audit_fg": "I", "audit_ts": 1498770000})
ScalaTestFailureLocation: com.generalmills.datalake.sql.DbReplicatorComponentTests at (DbReplicatorComponentTests.scala:12)
org.scalatest.exceptions.TestFailedException: Unsatisfied expectation:这个问题突出了一个事实，那就是我真的不喜欢Scala。我不知道存根-3是从哪里来的。我在this question中成功地重新编写了我的测试，但是我希望在这里能有一些洞察力来帮助我更好地理解，为什么我没有在上面的测试中嘲笑我认为我是什么呢？
Fwiw，我是在C#背景下来到Scala的。
更新:根据下面的答案，这是可行的：
test("A record should be inserted if the audit flag is 'I' and no existing record is found") {
val replicator = new DbReplicatorComponent with RepositoryComponent {
val _repo = stub[Repository]
override def repository: Repository = {
_repo
}
}
(replicator.repository.shouldSave _).when(record).returns(true)
(replicator.repository.findRecord _).when(Array("123", "foo")).returns(0L)
replicator.consumer.write(Array("123", "foo"), record)
(replicator.repository.insertRecord _).verify(record)
}回答 1
Stack Overflow用户
回答已采纳
发布于 2017-07-12 16:39:02
def repository: Repository --这是一种方法，每次调用它时都返回一个新存根。尝试将其设置为val，以在每次调用/访问时返回相同的存根：
test("A record should be inserted if the audit flag is 'I' and no existing record is found") {
val replicator = new DbReplicatorComponent with RepositoryComponent {
override val repository: Repository = stub[Repository]
}
// ...
}此外，您还使用Array作为参数类型。请注意scala中的Array("foo") != Array("foo")，因此我建议您在使用数组(findRecord)的when调用中使用argThat匹配器-参见此处：Unable to create stub with Array argument in ScalMock
或者尝试谓词匹配，如下所述：http://scalamock.org/user-guide/matching/
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/45059866
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