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HomeViewModelTest.kt
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HomeViewModelTest.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.UnconfinedTestDispatcher
import kotlinx.coroutines.test.resetMain
import kotlinx.coroutines.test.runTest
import kotlinx.coroutines.test.setMain
import org.junit.Assert.assertEquals
import org.junit.Test
// [START coroutine_test_homeviewmodel_test]
class HomeViewModelTest {
@Test
fun settingMainDispatcher() = runTest {
val testDispatcher = UnconfinedTestDispatcher(testScheduler)
Dispatchers.setMain(testDispatcher)
try {
val viewModel = HomeViewModel()
viewModel.loadMessage() // Uses testDispatcher, runs its coroutine eagerly
assertEquals("Greetings!", viewModel.message.value)
} finally {
Dispatchers.resetMain()
}
}
}
// [END coroutine_test_homeviewmodel_test]