android - 尽管 Realm 被模拟，但实际的 close() 方法被调用

Question

我有一个相当简单的 save() 方法来保存 RealmModel，在保存 realm.close() 之后调用，因为数据库不再需要。

问题:尽管使用 mockito 模拟了 Realm，但调用了实际的 close() 方法。这会导致异常:

IllegalStateException: Realm access from incorrect thread. Realm instance can only be closed on the thread it was created.

mockito 不能模拟 Realm 吗？我不想为了测试这个案例而包含 PowerMock :D

使用 realm-gradle-plugin 5.0.0 测试

---

测试类

import io.realm.Realm
import io.realm.RealmModel

class TestedClass {

    fun save(realm: Realm, objectToBeSaved: RealmModel) {
        // Persist your data in a transaction
        realm.executeTransaction {
            // Using executeTransaction with a lambda reduces code size
            // and makes it impossible to forget to commit the transaction.
            it.copyToRealm(objectToBeSaved)
        }
        // Close database after saving (this causes the exception)
        realm.close()
    }
}

---

单元测试

import com.nhaarman.mockito_kotlin.any
import com.nhaarman.mockito_kotlin.mock
import com.nhaarman.mockito_kotlin.verify

@Test
fun save() {
    val testedClass = TestedClass()
    val mockRealm: Realm = mock()
    val objectToBeSaved: RealmModel = mock()

    testedClass.save(mockRealm, objectToBeSaved) // this causes the exception

    verify(mockRealm).executeTransaction(any())
    verify(mockRealm).copyToRealm(objectToBeSaved)
    verify(mockRealm).close()
}

Answer 1

解决方案是新的 Realm 版本。

似乎在 realm-gradle-plugin 5.0.0 和 5.3.1 之间的某处，这个问题在 Realm 库端得到了修复，即使我找不到关于 changelog 的任何文档提到它。

这就是我最终必须完全测试 TestedClass

---

通过单元测试

import com.nhaarman.mockito_kotlin.argumentCaptor
import com.nhaarman.mockito_kotlin.inOrder
import com.nhaarman.mockito_kotlin.mock
import com.nhaarman.mockito_kotlin.verifyNoMoreInteractions

@Test
fun save() {
    val testedClass = TestedClass()
    val mockRealm: Realm = mock()
    val objectToBeSaved: RealmModel = mock()
    val captor = argumentCaptor<Realm.Transaction>()

    testedClass.save(mockRealm, objectToBeSaved)

    inOrder(mockRealm).apply {
        verify(mockRealm).executeTransaction(captor.capture())
        verify(mockRealm).close()

        // Now make sure the lambda passed to executeTransaction() does the right thing
        captor.firstValue.execute(mockRealm)

        verify(mockRealm).copyToRealm(objectToBeSaved)
        verifyNoMoreInteractions(mockRealm)
    }
}