| /* |
| * Copyright 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package androidx.compose.runtime.livedata |
| |
| import androidx.compose.Providers |
| import androidx.compose.getValue |
| import androidx.compose.mutableStateOf |
| import androidx.compose.setValue |
| import androidx.lifecycle.Lifecycle |
| import androidx.lifecycle.LifecycleOwner |
| import androidx.lifecycle.LifecycleRegistry |
| import androidx.lifecycle.MutableLiveData |
| import androidx.test.filters.MediumTest |
| import androidx.ui.core.LifecycleOwnerAmbient |
| import androidx.ui.test.createComposeRule |
| import androidx.ui.test.runOnIdle |
| import com.google.common.truth.Truth.assertThat |
| import org.junit.Rule |
| import org.junit.Test |
| import org.junit.runner.RunWith |
| import org.junit.runners.JUnit4 |
| |
| @MediumTest |
| @RunWith(JUnit4::class) |
| class LiveDataAdapterTest : LifecycleOwner { |
| |
| @get:Rule |
| val rule = createComposeRule() |
| |
| private val lifecycleRegistry = LifecycleRegistry(this).apply { |
| currentState = Lifecycle.State.RESUMED |
| } |
| |
| override fun getLifecycle() = lifecycleRegistry |
| |
| @Test |
| fun whenValueIsNotSetWeGotNull() { |
| val liveData = MutableLiveData<String>() |
| var realValue: String? = "to-be-updated" |
| rule.setContent { |
| realValue = liveData.observeAsState().value |
| } |
| |
| assertThat(realValue).isNull() |
| } |
| |
| @Test |
| fun weGotInitialValue() { |
| val liveData = MutableLiveData<String>() |
| liveData.postValue("value") |
| var realValue: String? = null |
| rule.setContent { |
| realValue = liveData.observeAsState().value |
| } |
| |
| assertThat(realValue).isEqualTo("value") |
| } |
| |
| @Test |
| fun weReceiveUpdates() { |
| val liveData = MutableLiveData<String>() |
| liveData.postValue("value") |
| var realValue: String? = null |
| rule.setContent { |
| realValue = liveData.observeAsState().value |
| } |
| |
| runOnIdle { |
| liveData.postValue("value2") |
| } |
| |
| runOnIdle { |
| assertThat(realValue).isEqualTo("value2") |
| } |
| } |
| |
| @Test |
| fun noUpdatesAfterDestroy() { |
| val liveData = MutableLiveData<String>() |
| liveData.postValue("value") |
| var realValue: String? = null |
| rule.setContent { |
| Providers(LifecycleOwnerAmbient provides this) { |
| realValue = liveData.observeAsState().value |
| } |
| } |
| |
| runOnIdle { |
| lifecycle.currentState = Lifecycle.State.DESTROYED |
| } |
| |
| runOnIdle { |
| liveData.postValue("value2") |
| } |
| |
| runOnIdle { |
| assertThat(realValue).isEqualTo("value") |
| } |
| } |
| |
| @Test |
| fun observerRemovedWhenDisposed() { |
| val liveData = MutableLiveData<String>() |
| var emit by mutableStateOf(false) |
| rule.setContent { |
| Providers(LifecycleOwnerAmbient provides this) { |
| if (emit) { |
| liveData.observeAsState() |
| } |
| } |
| } |
| |
| val initialCount = runOnIdle { lifecycle.observerCount } |
| |
| runOnIdle { emit = true } |
| |
| assertThat(runOnIdle { lifecycle.observerCount }).isEqualTo(initialCount + 1) |
| |
| runOnIdle { emit = false } |
| |
| assertThat(runOnIdle { lifecycle.observerCount }).isEqualTo(initialCount) |
| } |
| |
| @Test |
| fun noUpdatesWhenActivityStopped() { |
| val liveData = MutableLiveData<String>() |
| var realValue: String? = null |
| rule.setContent { |
| Providers(LifecycleOwnerAmbient provides this) { |
| realValue = liveData.observeAsState().value |
| } |
| } |
| |
| runOnIdle { |
| // activity stopped |
| lifecycle.currentState = Lifecycle.State.CREATED |
| } |
| |
| runOnIdle { |
| liveData.postValue("value2") |
| } |
| |
| runOnIdle { |
| assertThat(realValue).isNull() |
| } |
| |
| runOnIdle { |
| lifecycle.currentState = Lifecycle.State.RESUMED |
| } |
| |
| runOnIdle { |
| assertThat(realValue).isEqualTo("value2") |
| } |
| } |
| |
| @Test |
| fun initialValueIsUpdatedWithTheRealOneRightAfterIfLifecycleIsStarted() { |
| val liveData = MutableLiveData<String>() |
| liveData.postValue("value") |
| var realValue: String? = "to-be-updated" |
| lifecycleRegistry.currentState = Lifecycle.State.STARTED |
| rule.setContent { |
| Providers(LifecycleOwnerAmbient provides this) { |
| realValue = liveData.observeAsState(null).value |
| } |
| } |
| |
| assertThat(realValue).isEqualTo("value") |
| } |
| |
| @Test |
| fun currentValueIsUsedWhenWeHadRealAndDidntHaveInitialInCreated() { |
| val liveData = MutableLiveData<String>() |
| liveData.postValue("value") |
| var realValue = "to-be-updated" |
| lifecycleRegistry.currentState = Lifecycle.State.CREATED |
| rule.setContent { |
| Providers(LifecycleOwnerAmbient provides this) { |
| realValue = liveData.observeAsState().value!! |
| } |
| } |
| |
| assertThat(realValue).isEqualTo("value") |
| } |
| } |