Move `:core:data` fake repositories to `:core:data-test`

Now that these fake implementations are no longer used in the production source code (only in tests), we can safely extract them out of this module.
Hopefully, we'll later be able to use Kotlin testFixtures for that.

References:
- #709
- #875

core/data-test/src/main/kotlin/com/google/samples/apps/nowinandroid/core/data/test/TestDataModule.kt

@@ -22,11 +22,11 @@ import com.google.samples.apps.nowinandroid.core.data.repository.RecentSearchRep
 import com.google.samples.apps.nowinandroid.core.data.repository.SearchContentsRepository
 import com.google.samples.apps.nowinandroid.core.data.repository.TopicsRepository
 import com.google.samples.apps.nowinandroid.core.data.repository.UserDataRepository
-import com.google.samples.apps.nowinandroid.core.data.repository.fake.FakeNewsRepository
-import com.google.samples.apps.nowinandroid.core.data.repository.fake.FakeRecentSearchRepository
-import com.google.samples.apps.nowinandroid.core.data.repository.fake.FakeSearchContentsRepository
-import com.google.samples.apps.nowinandroid.core.data.repository.fake.FakeTopicsRepository
-import com.google.samples.apps.nowinandroid.core.data.repository.fake.FakeUserDataRepository
+import com.google.samples.apps.nowinandroid.core.data.test.repository.FakeNewsRepository
+import com.google.samples.apps.nowinandroid.core.data.test.repository.FakeRecentSearchRepository
+import com.google.samples.apps.nowinandroid.core.data.test.repository.FakeSearchContentsRepository
+import com.google.samples.apps.nowinandroid.core.data.test.repository.FakeTopicsRepository
+import com.google.samples.apps.nowinandroid.core.data.test.repository.FakeUserDataRepository
 import com.google.samples.apps.nowinandroid.core.data.util.NetworkMonitor
 import dagger.Binds
 import dagger.Module
@@ -38,7 +38,7 @@ import dagger.hilt.testing.TestInstallIn
     components = [SingletonComponent::class],
     replaces = [DataModule::class],
 )
-interface TestDataModule {
+internal interface TestDataModule {
     @Binds
     fun bindsTopicRepository(
         fakeTopicsRepository: FakeTopicsRepository,

core/data-test/src/main/kotlin/com/google/samples/apps/nowinandroid/core/data/test/repository/FakeNewsRepository.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.data.repository.fake
+package com.google.samples.apps.nowinandroid.core.data.test.repository
 
 import com.google.samples.apps.nowinandroid.core.data.Synchronizer
 import com.google.samples.apps.nowinandroid.core.data.model.asEntity
@@ -39,7 +39,7 @@ import javax.inject.Inject
  * This allows us to run the app with fake data, without needing an internet connection or working
  * backend.
  */
-class FakeNewsRepository @Inject constructor(
+internal class FakeNewsRepository @Inject constructor(
     @Dispatcher(IO) private val ioDispatcher: CoroutineDispatcher,
     private val datasource: FakeNiaNetworkDataSource,
 ) : NewsRepository {

core/data-test/src/main/kotlin/com/google/samples/apps/nowinandroid/core/data/test/repository/FakeRecentSearchRepository.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.data.repository.fake
+package com.google.samples.apps.nowinandroid.core.data.test.repository
 
 import com.google.samples.apps.nowinandroid.core.data.model.RecentSearchQuery
 import com.google.samples.apps.nowinandroid.core.data.repository.RecentSearchRepository
@@ -25,7 +25,7 @@ import javax.inject.Inject
 /**
  * Fake implementation of the [RecentSearchRepository]
  */
-class FakeRecentSearchRepository @Inject constructor() : RecentSearchRepository {
+internal class FakeRecentSearchRepository @Inject constructor() : RecentSearchRepository {
     override suspend fun insertOrReplaceRecentSearch(searchQuery: String) = Unit
 
     override fun getRecentSearchQueries(limit: Int): Flow<List<RecentSearchQuery>> =

core/data-test/src/main/kotlin/com/google/samples/apps/nowinandroid/core/data/test/repository/FakeSearchContentsRepository.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.data.repository.fake
+package com.google.samples.apps.nowinandroid.core.data.test.repository
 
 import com.google.samples.apps.nowinandroid.core.data.repository.SearchContentsRepository
 import com.google.samples.apps.nowinandroid.core.model.data.SearchResult
@@ -25,7 +25,7 @@ import javax.inject.Inject
 /**
  * Fake implementation of the [SearchContentsRepository]
  */
-class FakeSearchContentsRepository @Inject constructor() : SearchContentsRepository {
+internal class FakeSearchContentsRepository @Inject constructor() : SearchContentsRepository {
 
     override suspend fun populateFtsData() = Unit
     override fun searchContents(searchQuery: String): Flow<SearchResult> = flowOf()

core/data-test/src/main/kotlin/com/google/samples/apps/nowinandroid/core/data/test/repository/FakeTopicsRepository.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.data.repository.fake
+package com.google.samples.apps.nowinandroid.core.data.test.repository
 
 import com.google.samples.apps.nowinandroid.core.data.Synchronizer
 import com.google.samples.apps.nowinandroid.core.data.repository.TopicsRepository
@@ -36,7 +36,7 @@ import javax.inject.Inject
  * This allows us to run the app with fake data, without needing an internet connection or working
  * backend.
  */
-class FakeTopicsRepository @Inject constructor(
+internal class FakeTopicsRepository @Inject constructor(
     @Dispatcher(IO) private val ioDispatcher: CoroutineDispatcher,
     private val datasource: FakeNiaNetworkDataSource,
 ) : TopicsRepository {

core/data-test/src/main/kotlin/com/google/samples/apps/nowinandroid/core/data/test/repository/FakeUserDataRepository.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.google.samples.apps.nowinandroid.core.data.repository.fake
+package com.google.samples.apps.nowinandroid.core.data.test.repository
 
 import com.google.samples.apps.nowinandroid.core.data.repository.UserDataRepository
 import com.google.samples.apps.nowinandroid.core.datastore.NiaPreferencesDataSource
@@ -30,7 +30,7 @@ import javax.inject.Inject
  * This allows us to run the app with fake data, without needing an internet connection or working
  * backend.
  */
-class FakeUserDataRepository @Inject constructor(
+internal class FakeUserDataRepository @Inject constructor(
     private val niaPreferencesDataSource: NiaPreferencesDataSource,
 ) : UserDataRepository {