Added some Android unit tests

Author: danielroek

packages/image_picker/image_picker/example/android/app/src/test/java/io/flutter/plugins/imagepicker/ImagePickerDelegateTest.java

@@ -10,11 +10,14 @@
 import static org.mockito.Mockito.when;
 
 import android.Manifest;
+import android.annotation.TargetApi;
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.net.Uri;
+import android.os.Build;
+
 import io.flutter.plugin.common.MethodCall;
 import io.flutter.plugin.common.MethodChannel;
 import java.io.File;
@@ -96,6 +99,17 @@ public void chooseImageFromGallery_WhenPendingResultExists_FinishesWithAlreadyAc
     verifyNoMoreInteractions(mockResult);
   }
 
+  @Test
+  @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
+  public void chooseMultiImageFromGallery_WhenPendingResultExists_FinishesWithAlreadyActiveError() {
+    ImagePickerDelegate delegate = createDelegateWithPendingResultAndMethodCall();
+
+    delegate.chooseMultiImageFromGallery(mockMethodCall, mockResult);
+
+    verifyFinishedWithAlreadyActiveError();
+    verifyNoMoreInteractions(mockResult);
+  }
+
   @Test
   public void chooseImageFromGallery_WhenHasNoExternalStoragePermission_RequestsForPermission() {
     when(mockPermissionManager.isPermissionGranted(Manifest.permission.READ_EXTERNAL_STORAGE))
@@ -110,6 +124,21 @@ public void chooseImageFromGallery_WhenHasNoExternalStoragePermission_RequestsFo
             ImagePickerDelegate.REQUEST_EXTERNAL_IMAGE_STORAGE_PERMISSION);
   }
 
+  @Test
+  @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
+  public void chooseMultiImageFromGallery_WhenHasNoExternalStoragePermission_RequestsForPermission() {
+    when(mockPermissionManager.isPermissionGranted(Manifest.permission.READ_EXTERNAL_STORAGE))
+        .thenReturn(false);
+
+    ImagePickerDelegate delegate = createDelegate();
+    delegate.chooseMultiImageFromGallery(mockMethodCall, mockResult);
+
+    verify(mockPermissionManager)
+        .askForPermission(
+            Manifest.permission.READ_EXTERNAL_STORAGE,
+            ImagePickerDelegate.REQUEST_EXTERNAL_MULTI_IMAGE_STORAGE_PERMISSION);
+  }
+
   @Test
   public void
       chooseImageFromGallery_WhenHasExternalStoragePermission_LaunchesChooseFromGalleryIntent() {
@@ -124,6 +153,21 @@ public void chooseImageFromGallery_WhenHasNoExternalStoragePermission_RequestsFo
             any(Intent.class), eq(ImagePickerDelegate.REQUEST_CODE_CHOOSE_IMAGE_FROM_GALLERY));
   }
 
+  @Test
+  @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
+  public void
+      chooseMultiImageFromGallery_WhenHasExternalStoragePermission_LaunchesChooseFromGalleryIntent() {
+    when(mockPermissionManager.isPermissionGranted(Manifest.permission.READ_EXTERNAL_STORAGE))
+        .thenReturn(true);
+
+    ImagePickerDelegate delegate = createDelegate();
+    delegate.chooseMultiImageFromGallery(mockMethodCall, mockResult);
+
+    verify(mockActivity)
+        .startActivityForResult(
+            any(Intent.class), eq(ImagePickerDelegate.REQUEST_CODE_CHOOSE_MULTI_IMAGE_FROM_GALLERY));
+  }
+
   @Test
   public void takeImageWithCamera_WhenPendingResultExists_FinishesWithAlreadyActiveError() {
     ImagePickerDelegate delegate = createDelegateWithPendingResultAndMethodCall();
@@ -217,6 +261,22 @@ public void takeImageWithCamera_WhenCameraPermissionNotPresent_RequestsForPermis
             any(Intent.class), eq(ImagePickerDelegate.REQUEST_CODE_CHOOSE_IMAGE_FROM_GALLERY));
   }
 
+  @Test
+  @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
+  public void
+  onRequestChooseMultiImagePermissionsResult_WhenReadExternalStorageGranted_LaunchesChooseMultiImageFromGalleryIntent() {
+    ImagePickerDelegate delegate = createDelegateWithPendingResultAndMethodCall();
+
+    delegate.onRequestPermissionsResult(
+            ImagePickerDelegate.REQUEST_EXTERNAL_MULTI_IMAGE_STORAGE_PERMISSION,
+            new String[] {Manifest.permission.READ_EXTERNAL_STORAGE},
+            new int[] {PackageManager.PERMISSION_GRANTED});
+
+    verify(mockActivity)
+            .startActivityForResult(
+                    any(Intent.class), eq(ImagePickerDelegate.REQUEST_CODE_CHOOSE_MULTI_IMAGE_FROM_GALLERY));
+  }
+
   @Test
   public void
       onRequestChooseVideoPermissionsResult_WhenReadExternalStorageGranted_LaunchesChooseVideoFromGalleryIntent() {

packages/image_picker/image_picker/example/android/app/src/test/java/io/flutter/plugins/imagepicker/ImagePickerPluginTest.java

@@ -24,6 +24,7 @@ public class ImagePickerPluginTest {
   private static final int SOURCE_CAMERA = 0;
   private static final int SOURCE_GALLERY = 1;
   private static final String PICK_IMAGE = "pickImage";
+  private static final String PICK_MULTI_IMAGE = "pickMultiImage";
   private static final String PICK_VIDEO = "pickVideo";
 
   @Rule public ExpectedException exception = ExpectedException.none();
@@ -84,6 +85,14 @@ public void onMethodCall_WhenSourceIsGallery_InvokesChooseImageFromGallery() {
     verifyZeroInteractions(mockResult);
   }
 
+  @Test
+  public void onMethodCall_InvokesChooseMultiImageFromGallery() {
+    MethodCall call = buildMethodCall(PICK_MULTI_IMAGE, null);
+    plugin.onMethodCall(call, mockResult);
+    verify(mockImagePickerDelegate).chooseMultiImageFromGallery(eq(call), any());
+    verifyZeroInteractions(mockResult);
+  }
+
   @Test
   public void onMethodCall_WhenSourceIsCamera_InvokesTakeImageWithCamera() {
     MethodCall call = buildMethodCall(PICK_IMAGE, SOURCE_CAMERA);
@@ -145,7 +154,7 @@ public void onConstructor_WhenContextTypeIsActivity_ShouldNotCrash() {
         "No exception thrown when ImagePickerPlugin() ran with context instanceof Activity", true);
   }
 
-  private MethodCall buildMethodCall(String method, final int source) {
+  private MethodCall buildMethodCall(String method, final Integer source) {
     final Map<String, Object> arguments = new HashMap<>();
     arguments.put("source", source);