add testdouble for newsresourcefts dao

core/data/src/test/kotlin/com/google/samples/apps/nowinandroid/core/data/testdoubles/TestNewsResourceFtsDao.kt

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * 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.google.samples.apps.nowinandroid.core.data.testdoubles
+
+import com.google.samples.apps.nowinandroid.core.database.dao.NewsResourceFtsDao
+import com.google.samples.apps.nowinandroid.core.database.model.NewsResourceFtsEntity
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.flow.update
+
+class TestNewsResourceFtsDao : NewsResourceFtsDao {
+    private val entitiesStateFlow = MutableStateFlow(emptyList<NewsResourceFtsEntity>())
+
+    override suspend fun insertAll(newsResources: List<NewsResourceFtsEntity>) {
+        entitiesStateFlow.update { oldValues ->
+            (oldValues + newsResources)
+                .distinctBy { it.newsResourceId }
+        }
+    }
+
+    override fun searchAllNewsResources(query: String): Flow<List<String>> {
+        val results = entitiesStateFlow.value.filter { entity ->
+            entity.title.contains(query) || entity.content.contains(query)
+        }
+            .map { it.newsResourceId }
+
+        return flowOf(results.distinct())
+    }
+
+    override fun getCount(): Flow<Int> {
+        return flowOf(entitiesStateFlow.value.size)
+    }
+}