DATACMNS-800 - Add deleteAllById to CoroutineCrudRepository.

Original pull request: #476.

src/main/kotlin/org/springframework/data/repository/kotlin/CoroutineCrudRepository.kt

@@ -132,6 +132,15 @@ interface CoroutineCrudRepository<T, ID> : Repository<T, ID> {
 	 */
 	suspend fun delete(entity: T)
 
+	/**
+	 * Deletes all instances of the type `T` with the given IDs.
+	 *
+	 * @param ids must not be null nor contain any null values.
+	 * @throws IllegalArgumentException in case the given [ids][Iterable] or one of its items is null.
+	 * @since 2.5
+	 */
+	suspend fun deleteAllById(ids: Iterable<ID>)
+
 	/**
 	 * Deletes the given entities.
 	 *

src/test/kotlin/org/springframework/data/repository/kotlin/CoroutineCrudRepositoryUnitTests.kt

@@ -140,6 +140,18 @@ class CoroutineCrudRepositoryUnitTests {
 		assertThat(result).isTrue()
 	}
 
+	@Test // DATACMNS-800
+	fun shouldInvokeDeleteAllById() {
+
+		every { backingRepository.deleteAllById(listOf("foo", "bar")) } returns Mono.empty()
+
+		runBlocking {
+			coRepository.deleteAllById(listOf("foo", "bar"))
+		}
+
+		verify { backingRepository.deleteAllById(listOf("foo", "bar")) }
+	}
+
 	@Test // DATACMNS-1508
 	fun shouldInvokeDeleteAll() {