/
HomeViewModelTestUsingRule.kt
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/
HomeViewModelTestUsingRule.kt
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/*
* Copyright 2022 Google LLC
*
* 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
*
* https://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 com.example.android.coroutines.testing
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.test.TestDispatcher
import kotlinx.coroutines.test.UnconfinedTestDispatcher
import kotlinx.coroutines.test.resetMain
import kotlinx.coroutines.test.runTest
import kotlinx.coroutines.test.setMain
import org.junit.Assert
import org.junit.Assert.assertEquals
import org.junit.Rule
import org.junit.Test
import org.junit.rules.TestWatcher
import org.junit.runner.Description
// [START coroutine_test_homeviewmodeltest_with_rule]
// Reusable JUnit4 TestRule to override the Main dispatcher
class MainDispatcherRule(
val testDispatcher: TestDispatcher = UnconfinedTestDispatcher(),
) : TestWatcher() {
override fun starting(description: Description) {
Dispatchers.setMain(testDispatcher)
}
override fun finished(description: Description) {
Dispatchers.resetMain()
}
}
class HomeViewModelTestUsingRule {
@get:Rule
val mainDispatcherRule = MainDispatcherRule()
@Test
fun settingMainDispatcher() = runTest { // Uses Main’s scheduler
val viewModel = HomeViewModel()
viewModel.loadMessage()
assertEquals("Greetings!", viewModel.message.value)
}
}
// [END coroutine_test_homeviewmodeltest_with_rule]