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KeyedQueryPagingSourceTest.kt
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KeyedQueryPagingSourceTest.kt
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package app.cash.sqldelight.paging3
import androidx.paging.PagingConfig
import androidx.paging.PagingSource.LoadParams.Refresh
import androidx.paging.PagingSource.LoadResult
import androidx.paging.PagingState
import app.cash.sqldelight.Query
import app.cash.sqldelight.Transacter
import app.cash.sqldelight.TransacterImpl
import app.cash.sqldelight.db.SqlCursor
import app.cash.sqldelight.db.SqlDriver
import app.cash.sqldelight.driver.jdbc.sqlite.JdbcSqliteDriver
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.runBlocking
import org.junit.Before
import org.junit.Test
import kotlin.coroutines.EmptyCoroutineContext
import kotlin.test.assertEquals
import kotlin.test.assertNull
@ExperimentalCoroutinesApi
class KeyedQueryPagingSourceTest {
private lateinit var driver: SqlDriver
private lateinit var transacter: Transacter
@Before fun before() {
driver = JdbcSqliteDriver(JdbcSqliteDriver.IN_MEMORY)
driver.execute(null, "CREATE TABLE testTable(value INTEGER PRIMARY KEY)", 0)
(0L until 10L).forEach { this.insert(it) }
transacter = object : TransacterImpl(driver) {}
}
@Test fun `aligned page exhaustion gives correct results`() {
val source = KeyedQueryPagingSource(
queryProvider = this::query,
pageBoundariesProvider = this::pageBoundaries,
transacter = transacter,
context = EmptyCoroutineContext,
)
runBlocking {
val expected = (0L until 10L).chunked(2).iterator()
var nextKey: Long? = null
do {
val results = source.load(Refresh(nextKey, 2, false))
nextKey = (results as LoadResult.Page).nextKey
assertEquals(expected = expected.next(), actual = results.data)
} while (nextKey != null)
}
}
@Test fun `misaligned page exhastion gives correct results`() {
val source = KeyedQueryPagingSource(
queryProvider = this::query,
pageBoundariesProvider = this::pageBoundaries,
transacter = transacter,
context = EmptyCoroutineContext,
)
runBlocking {
val expected = (0L until 10L).chunked(3).iterator()
var nextKey: Long? = null
do {
val results = source.load(Refresh(nextKey, 3, false))
nextKey = (results as LoadResult.Page).nextKey
assertEquals(expected = expected.next(), actual = results.data)
} while (nextKey != null)
}
}
@Test fun `requesting a page with anchor not in step passes`() {
val source = KeyedQueryPagingSource(
queryProvider = this::query,
pageBoundariesProvider = this::pageBoundaries,
transacter = transacter,
context = EmptyCoroutineContext,
)
val results = runBlocking { source.load(Refresh(key = 5L, loadSize = 2, false)) }
assertEquals(listOf(5L), (results as LoadResult.Page).data)
}
@Test fun `misaligned last page has correct data`() {
val source = KeyedQueryPagingSource(
queryProvider = this::query,
pageBoundariesProvider = this::pageBoundaries,
transacter = transacter,
context = EmptyCoroutineContext,
)
val results = runBlocking { source.load(Refresh(key = 9L, loadSize = 3, false)) }
assertEquals(expected = listOf(9L), (results as LoadResult.Page).data)
assertEquals(expected = 6L, results.prevKey)
assertEquals(expected = null, results.nextKey)
}
@Test fun `invoking getRefreshKey before first load returns null key`() {
val source = KeyedQueryPagingSource(
queryProvider = this::query,
pageBoundariesProvider = this::pageBoundaries,
transacter = transacter,
context = EmptyCoroutineContext,
)
assertNull(
source.getRefreshKey(
PagingState(
emptyList(),
null,
PagingConfig(3),
0,
),
),
)
}
@Test fun `invoking getRefreshKey with loaded first page returns correct result`() {
val source = KeyedQueryPagingSource(
queryProvider = this::query,
pageBoundariesProvider = this::pageBoundaries,
transacter = transacter,
context = EmptyCoroutineContext,
)
val results = runBlocking { source.load(Refresh(key = null, loadSize = 3, false)) }
val refreshKey = source.getRefreshKey(
PagingState(
listOf(results as LoadResult.Page),
null,
PagingConfig(3),
0,
),
)
assertEquals(0L, refreshKey)
}
@Test fun `invoking getRefreshKey with single loaded middle page returns correct result`() {
val source = KeyedQueryPagingSource(
queryProvider = this::query,
pageBoundariesProvider = this::pageBoundaries,
transacter = transacter,
context = EmptyCoroutineContext,
)
val results = runBlocking { source.load(Refresh(key = 6L, loadSize = 3, false)) }
val refreshKey = source.getRefreshKey(
PagingState(
listOf(results as LoadResult.Page),
null,
PagingConfig(3),
0,
),
)
assertEquals(6L, refreshKey)
}
private fun pageBoundaries(anchor: Long?, limit: Long): Query<Long> {
val sql = """
|SELECT value
|FROM (
| SELECT
| value,
| CASE
| WHEN (row_number() OVER(ORDER BY value ASC) - 1) % ? = 0 THEN 1
| WHEN value = ? THEN 1
| ELSE 0
| END page_boundary
| FROM testTable
| ORDER BY value ASC
|)
|WHERE page_boundary = 1;
""".trimMargin()
return object : Query<Long>({ cursor -> cursor.getLong(0)!! }) {
override fun <R> execute(mapper: (SqlCursor) -> R) = driver.executeQuery(identifier = 3, sql = sql, mapper = mapper, parameters = 2) {
bindLong(0, limit)
bindLong(1, anchor)
}
override fun addListener(listener: Listener) = Unit
override fun removeListener(listener: Listener) = Unit
}
}
private fun query(beginInclusive: Long, endExclusive: Long?): Query<Long> {
val sql = """
|SELECT value FROM testTable
|WHERE value >= :1 AND (value < :2 OR :2 IS NULL)
|ORDER BY value ASC;
""".trimMargin()
return object : Query<Long>(
{ cursor -> cursor.getLong(0)!! },
) {
override fun <R> execute(mapper: (SqlCursor) -> R) = driver.executeQuery(identifier = 2, sql = sql, mapper = mapper, parameters = 2) {
bindLong(0, beginInclusive)
bindLong(1, endExclusive)
}
override fun addListener(listener: Listener) = Unit
override fun removeListener(listener: Listener) = Unit
}
}
private fun insert(value: Long, db: SqlDriver = driver) {
db.execute(0, "INSERT INTO testTable (value) VALUES (?)", 1) {
bindLong(0, value)
}
}
}