ObjectWatcherTest.kt

TLDR

This file contains a test class ObjectWatcherTest which tests the functionality of the ObjectWatcher class in the leakcanary package.

Methods

There are no methods in this file.

Classes

ObjectWatcherTest

This test class is used to validate the functionality of the ObjectWatcher class. It contains two test methods:

• unreachable object not retained: This test verifies that when an object is no longer reachable, it is not retained by the ObjectWatcher. It sets up an ObjectWatcher instance, creates an object reference (ref) and expects it to be weakly reachable. Then, it sets the object reference to null, triggers garbage collection, and checks if the ObjectWatcher does not have any retained objects.
• reachable object retained: This test validates that when an object is still reachable, it is retained by the ObjectWatcher. Similar to the previous test, it sets up an ObjectWatcher instance, creates an object reference (ref) and expects it to be weakly reachable. Then, it triggers garbage collection and checks if the ObjectWatcher has any retained objects.

package leakcanary

import leakcanary.GcTrigger.Default.runGc
import org.assertj.core.api.Assertions.assertThat
import org.junit.Test
import java.util.concurrent.Executor

class ObjectWatcherTest {

  private val checkRetainedExecutor = Executor {
    it.run()
  }

  private val objectWatcher = ObjectWatcher({ time }, checkRetainedExecutor)
  var time: Long = 0

  var ref: Any? = Any()

  @Test fun `unreachable object not retained`() {
    objectWatcher.expectWeaklyReachable(ref!!, "unreachable object not retained")
    ref = null
    runGc()
    assertThat(objectWatcher.hasRetainedObjects).isFalse()
  }

  @Test fun `reachable object retained`() {
    objectWatcher.expectWeaklyReachable(ref!!, "reachable object retained")
    runGc()
    assertThat(objectWatcher.hasRetainedObjects).isTrue()
  }
}