Add unit tests.

engine/src/test/java/com/google/android/fhir/impl/FhirEngineImplTest.kt

@@ -763,6 +763,26 @@ class FhirEngineImplTest {
         .inOrder()
     }
 
+  @Test
+  fun `test consolidate() is called`() = runBlocking {
+    assertThat(services.database.getLocalChangesCount()).isEqualTo(1)
+    fhirEngine
+      .syncUpload(UploadStrategy.SingleResourcePost) {
+        flowOf(
+          UploadRequestResult.Success(
+            listOf(
+              ResourceUploadResponseMapping(
+                it,
+                TEST_PATIENT_1,
+              ),
+            ),
+          ),
+        )
+      }
+      .collect {}
+    assertThat(services.database.getLocalChangesCount()).isEqualTo(0)
+  }
+
   companion object {
     private const val TEST_PATIENT_1_ID = "test_patient_1"
     private var TEST_PATIENT_1 =

engine/src/test/java/com/google/android/fhir/sync/upload/ResourceConsolidatorFactoryTest.kt

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * 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 com.google.android.fhir.sync.upload
+
+import androidx.test.core.app.ApplicationProvider
+import com.google.android.fhir.FhirServices
+import kotlin.test.assertTrue
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+
+@RunWith(RobolectricTestRunner::class)
+class ResourceConsolidatorFactoryTest {
+  private val services =
+    FhirServices.builder(ApplicationProvider.getApplicationContext()).inMemory().build()
+
+  @Test
+  fun `return HttpPostResourceConsolidator instance `() {
+    val httpPostResourceConsolidator =
+      ResourceConsolidatorFactory.byHttpVerb(
+        UploadStrategy.SingleResourcePost.requestGeneratorMode,
+        services.database,
+      )
+    assertTrue(httpPostResourceConsolidator is HttpPostResourceConsolidator)
+  }
+
+  @Test
+  fun `return DefaultResourceConsolidator instance `() {
+    val httpPostResourceConsolidator =
+      ResourceConsolidatorFactory.byHttpVerb(
+        UploadStrategy.AllChangesSquashedBundlePut.requestGeneratorMode,
+        services.database,
+      )
+    assertTrue(httpPostResourceConsolidator is DefaultResourceConsolidator)
+  }
+}