Use WorkManager for downloads

brouter-routing-app/src/androidTest/java/btools/routingapp/DownloadWorkerTest.java

@@ -0,0 +1,71 @@
+package btools.routingapp;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+import android.content.Context;
+
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.work.Data;
+import androidx.work.ListenableWorker.Result;
+import androidx.work.testing.TestWorkerBuilder;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
+
+@RunWith(AndroidJUnit4.class)
+public class DownloadWorkerTest {
+  private Context context;
+  private Executor executor;
+
+  @Before
+  public void setUp() {
+    context = ApplicationProvider.getApplicationContext();
+    executor = Executors.newSingleThreadExecutor();
+  }
+
+  @Test
+  public void testDownloadNewFile() {
+    Data inputData = new Data.Builder()
+      .putStringArray(DownloadWorker.KEY_INPUT_SEGMENT_NAMES, new String[]{"E105_N50"})
+      .build();
+
+    DownloadWorker worker =
+      TestWorkerBuilder.from(context, DownloadWorker.class, executor)
+        .setInputData(inputData)
+        .build();
+
+    Result result = worker.doWork();
+    assertThat(result, is(Result.success()));
+  }
+
+  @Test
+  public void testDownloadInvalidSegment() {
+    Data inputData = new Data.Builder()
+      .putStringArray(DownloadWorker.KEY_INPUT_SEGMENT_NAMES, new String[]{"X00"})
+      .build();
+
+    DownloadWorker worker =
+      TestWorkerBuilder.from(context, DownloadWorker.class, executor)
+        .setInputData(inputData)
+        .build();
+
+    Result result = worker.doWork();
+    assertThat(result, is(Result.failure()));
+  }
+
+  @Test
+  public void testDownloadNoSegments() {
+    DownloadWorker worker =
+      TestWorkerBuilder.from(context, DownloadWorker.class, executor)
+        .build();
+
+    Result result = worker.doWork();
+    assertThat(result, is(Result.failure()));
+  }
+}