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WithPagingDataDiffer.kt
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WithPagingDataDiffer.kt
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/*
* Copyright (C) 2016 Square, Inc.
*
* 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 app.cash.sqldelight.paging3
import androidx.paging.AsyncPagingDataDiffer
import androidx.paging.PagingData
import androidx.recyclerview.widget.DiffUtil
import androidx.recyclerview.widget.ListUpdateCallback
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.launch
import kotlinx.coroutines.test.TestScope
import kotlinx.coroutines.test.UnconfinedTestDispatcher
import kotlinx.coroutines.test.advanceUntilIdle
private object NoopListCallback : ListUpdateCallback {
override fun onChanged(position: Int, count: Int, payload: Any?) = Unit
override fun onMoved(fromPosition: Int, toPosition: Int) = Unit
override fun onInserted(position: Int, count: Int) = Unit
override fun onRemoved(position: Int, count: Int) = Unit
}
@ExperimentalCoroutinesApi
fun <T : Any> PagingData<T>.withPagingDataDiffer(
testScope: TestScope,
diffCallback: DiffUtil.ItemCallback<T>,
block: AsyncPagingDataDiffer<T>.() -> Unit,
) {
val testDispatcher = UnconfinedTestDispatcher(testScope.testScheduler)
val pagingDataDiffer = AsyncPagingDataDiffer(
diffCallback,
NoopListCallback,
mainDispatcher = testDispatcher,
workerDispatcher = testDispatcher,
)
val job = testScope.launch {
pagingDataDiffer.submitData(this@withPagingDataDiffer)
}
testScope.advanceUntilIdle()
block(pagingDataDiffer)
job.cancel()
}