findFragmentByTag 的单元测试条件
Unit test condition for findFragmentByTag
Android Studio 3.2 Canary 2
Build #AI-173.4591728, built on February 8, 2018
JRE: 1.8.0_152-release-1024-b01 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Linux 4.14.18-300.fc27.x86_64
我有以下 activity 并且我想对片段已经附加并且应该 return 为非空的情况进行单元测试。并且应该落入else条件:
这是我的 activity:
public class BillingActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.billing_container);
if(getSupportFragmentManager().findFragmentByTag(BillingView.TAG) == null) {
final FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(
R.id.billing_view_container,
BillingView.newInstance(),
BillingView.TAG);
fragmentTransaction.commit();
}
else {
Timber.d("Fragment already attached");
}
}
}
测试 class 是这样的:我可以编写测试来附加一个片段,但我想测试片段已经附加并且应该 return 非空的条件。
class BillingActivityTest: BaseRobolectricTestRunner() {
private lateinit var billingActivity: BillingActivity
@Before
fun setup() {
billingActivity = Robolectric.buildActivity(BillingActivity::class.java)
.create()
.start()
.get()
}
@Test
fun testBillingActivityIsNotNullValue() {
assertThat(billingActivity, `is`(notNullValue()))
}
@Test
fun testBillingFragmentHasStarted() {
val actualFragment = billingActivity
.supportFragmentManager
.findFragmentByTag(BillingView.TAG)
assertThat(actualFragment.tag, `is`(BillingView.TAG))
}
@Test
fun testBillingFragmentAlreadyAttached() {
/* how to test */
}
}
感谢您的任何建议,
我通过调用 activity.recreate()
设法做到了这一点
@Test
fun testBillingFragmentAlreadyAttached() {
billingActivity.recreate()
val actualFragment = billingActivity
.supportFragmentManager
.findFragmentByTag(BillingView.TAG)
assertThat(actualFragment.tag, `is`(BillingView.TAG))
}
不过如果谁有更好的方法。很高兴听到另一个解决方案。
方法 (using recreate()
) 只要复制了您请求的行为,它就会起作用。我相信这是最短的方法。
尽管如此,我不能认为它是一个纯单元测试,因为实际上你在作弊,因为显然你对 activity 的 recreate()
操作不感兴趣(这也可能是有副作用)。
如果您想执行纯单元测试,那么这里是执行此操作的方法。已这样声明 activity:
class MainActivity : AppCompatActivity() {
internal var fragmentManagerRetriever = FragmentManagerRetriever()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val fragmentManager = fragmentManagerRetriever.getFragmentManager(this)
if (fragmentManager.findFragmentByTag("TAG") == null) {
val fragmentTransaction = fragmentManager.beginTransaction()
fragmentTransaction.add(SomeFragment(), "TAG")
fragmentTransaction.commit()
}
}
}
其中FragmentManagerRetriever
就这么简单:
class FragmentManagerRetriever {
public FragmentManager getFragmentManager(FragmentActivity activity) {
return activity.getSupportFragmentManager();
}
}
然后你就有了执行纯单元测试的接缝:
@Test
fun nullCase() {
val activityController = Robolectric.buildActivity(MainActivity::class.java)
val activity = activityController.get()
val fragmentManagerRetriever = mock(FragmentManagerRetriever::class.java)
val fragmentManager = mock(FragmentManager::class.java)
val fragmentTransaction = mock(FragmentTransaction::class.java)
activity.fragmentManagerRetriever = fragmentManagerRetriever
`when`(fragmentManagerRetriever.getFragmentManager(activity)).thenReturn(fragmentManager)
`when`(fragmentManager.findFragmentByTag("TAG")).thenReturn(null)
`when`(fragmentManager.beginTransaction()).thenReturn(fragmentTransaction)
activityController.create()
val inOrder = Mockito.inOrder(fragmentTransaction)
inOrder.verify(fragmentTransaction).add(ArgumentMatchers.any(SomeFragment::class.java), ArgumentMatchers.eq("TAG"))
inOrder.verify(fragmentTransaction).commit()
}
以及 non-null 个案例的测试:
@Test
fun nonNullCase() {
val activityController = Robolectric.buildActivity(MainActivity::class.java)
val activity = activityController.get()
val fragmentManagerRetriever = mock(FragmentManagerRetriever::class.java)
val fragmentManager = mock(FragmentManager::class.java)
val fragmentTransaction = mock(FragmentTransaction::class.java)
activity.fragmentManagerRetriever = fragmentManagerRetriever
`when`(fragmentManagerRetriever.getFragmentManager(activity)).thenReturn(fragmentManager)
`when`(fragmentManager.findFragmentByTag("TAG")).thenReturn(mock(Fragment::class.java))
activityController.create()
verifyZeroInteractions(fragmentTransaction)
}
Android Studio 3.2 Canary 2
Build #AI-173.4591728, built on February 8, 2018
JRE: 1.8.0_152-release-1024-b01 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Linux 4.14.18-300.fc27.x86_64
我有以下 activity 并且我想对片段已经附加并且应该 return 为非空的情况进行单元测试。并且应该落入else条件:
这是我的 activity:
public class BillingActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.billing_container);
if(getSupportFragmentManager().findFragmentByTag(BillingView.TAG) == null) {
final FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(
R.id.billing_view_container,
BillingView.newInstance(),
BillingView.TAG);
fragmentTransaction.commit();
}
else {
Timber.d("Fragment already attached");
}
}
}
测试 class 是这样的:我可以编写测试来附加一个片段,但我想测试片段已经附加并且应该 return 非空的条件。
class BillingActivityTest: BaseRobolectricTestRunner() {
private lateinit var billingActivity: BillingActivity
@Before
fun setup() {
billingActivity = Robolectric.buildActivity(BillingActivity::class.java)
.create()
.start()
.get()
}
@Test
fun testBillingActivityIsNotNullValue() {
assertThat(billingActivity, `is`(notNullValue()))
}
@Test
fun testBillingFragmentHasStarted() {
val actualFragment = billingActivity
.supportFragmentManager
.findFragmentByTag(BillingView.TAG)
assertThat(actualFragment.tag, `is`(BillingView.TAG))
}
@Test
fun testBillingFragmentAlreadyAttached() {
/* how to test */
}
}
感谢您的任何建议,
我通过调用 activity.recreate()
设法做到了这一点@Test
fun testBillingFragmentAlreadyAttached() {
billingActivity.recreate()
val actualFragment = billingActivity
.supportFragmentManager
.findFragmentByTag(BillingView.TAG)
assertThat(actualFragment.tag, `is`(BillingView.TAG))
}
不过如果谁有更好的方法。很高兴听到另一个解决方案。
方法 recreate()
) 只要复制了您请求的行为,它就会起作用。我相信这是最短的方法。
尽管如此,我不能认为它是一个纯单元测试,因为实际上你在作弊,因为显然你对 activity 的 recreate()
操作不感兴趣(这也可能是有副作用)。
如果您想执行纯单元测试,那么这里是执行此操作的方法。已这样声明 activity:
class MainActivity : AppCompatActivity() {
internal var fragmentManagerRetriever = FragmentManagerRetriever()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val fragmentManager = fragmentManagerRetriever.getFragmentManager(this)
if (fragmentManager.findFragmentByTag("TAG") == null) {
val fragmentTransaction = fragmentManager.beginTransaction()
fragmentTransaction.add(SomeFragment(), "TAG")
fragmentTransaction.commit()
}
}
}
其中FragmentManagerRetriever
就这么简单:
class FragmentManagerRetriever {
public FragmentManager getFragmentManager(FragmentActivity activity) {
return activity.getSupportFragmentManager();
}
}
然后你就有了执行纯单元测试的接缝:
@Test
fun nullCase() {
val activityController = Robolectric.buildActivity(MainActivity::class.java)
val activity = activityController.get()
val fragmentManagerRetriever = mock(FragmentManagerRetriever::class.java)
val fragmentManager = mock(FragmentManager::class.java)
val fragmentTransaction = mock(FragmentTransaction::class.java)
activity.fragmentManagerRetriever = fragmentManagerRetriever
`when`(fragmentManagerRetriever.getFragmentManager(activity)).thenReturn(fragmentManager)
`when`(fragmentManager.findFragmentByTag("TAG")).thenReturn(null)
`when`(fragmentManager.beginTransaction()).thenReturn(fragmentTransaction)
activityController.create()
val inOrder = Mockito.inOrder(fragmentTransaction)
inOrder.verify(fragmentTransaction).add(ArgumentMatchers.any(SomeFragment::class.java), ArgumentMatchers.eq("TAG"))
inOrder.verify(fragmentTransaction).commit()
}
以及 non-null 个案例的测试:
@Test
fun nonNullCase() {
val activityController = Robolectric.buildActivity(MainActivity::class.java)
val activity = activityController.get()
val fragmentManagerRetriever = mock(FragmentManagerRetriever::class.java)
val fragmentManager = mock(FragmentManager::class.java)
val fragmentTransaction = mock(FragmentTransaction::class.java)
activity.fragmentManagerRetriever = fragmentManagerRetriever
`when`(fragmentManagerRetriever.getFragmentManager(activity)).thenReturn(fragmentManager)
`when`(fragmentManager.findFragmentByTag("TAG")).thenReturn(mock(Fragment::class.java))
activityController.create()
verifyZeroInteractions(fragmentTransaction)
}