Fixes #3464, App posts deletion request notifications ({{subst:idw}}) on the wrong user's talk page (#3495)

* Fixed #3464: App posts deletion request notifications ({{subst:idw}}) on the wrong user's talk page

* Fixed DeleteHelperTest.kt

* Fixed DeleteHelper tests and null-pointer exception

* Modified DeleteHelper makeDeletion() test

* Reverted unintentionally modified Project.xml

* Raising exception when nominating for deletion with empty creator name

* Fixed code style

* Fixed code style

app/src/main/java/fr/free/nrw/commons/delete/DeleteHelper.java

@@ -98,6 +98,12 @@ public class DeleteHelper {
         String userPageString = "\n{{subst:idw|" + media.getFilename() +
                 "}} ~~~~";
 
+        String creator = media.getCreator();
+        if (creator == null || creator.isEmpty()) {
+            throw new RuntimeException("Failed to nominate for deletion");
+        }
+        String creatorName = creator.replace(" (page does not exist)", "");
+
         return pageEditClient.prependEdit(media.filename, fileDeleteString + "\n", summary)
                 .flatMap(result -> {
                     if (result) {
@@ -111,7 +117,7 @@ public class DeleteHelper {
                     throw new RuntimeException("Failed to nominate for deletion");
                 }).flatMap(result -> {
                     if (result) {
-                        return pageEditClient.appendEdit("User_Talk:" + username, userPageString + "\n", summary);
+                        return pageEditClient.appendEdit("User_Talk:" + creatorName, userPageString + "\n", summary);
                     }
                     throw new RuntimeException("Failed to nominate for deletion");
                 });

app/src/test/kotlin/fr/free/nrw/commons/delete/DeleteHelperTest.kt

@@ -1,6 +1,8 @@
 package fr.free.nrw.commons.delete
 
 import android.content.Context
+import com.nhaarman.mockitokotlin2.eq
+import com.nhaarman.mockitokotlin2.verify
 import fr.free.nrw.commons.Media
 import fr.free.nrw.commons.actions.PageEditClient
 import fr.free.nrw.commons.notification.NotificationHelper
@@ -14,7 +16,6 @@ import org.mockito.InjectMocks
 import org.mockito.Mock
 import org.mockito.Mockito.`when`
 import org.mockito.MockitoAnnotations
-import org.wikipedia.AppAdapter
 import javax.inject.Inject
 import javax.inject.Named
 
@@ -65,9 +66,13 @@ class DeleteHelperTest {
         `when`(media?.displayTitle).thenReturn("Test file")
         media?.filename="Test file.jpg"
 
+        val creatorName = "Creator"
+        `when`(media?.getCreator()).thenReturn("$creatorName (page does not exist)")
+
         val makeDeletion = deleteHelper?.makeDeletion(context, media, "Test reason")?.blockingGet()
         assertNotNull(makeDeletion)
         assertTrue(makeDeletion!!)
+        verify(pageEditClient)?.appendEdit(eq("User_Talk:$creatorName"), ArgumentMatchers.anyString(), ArgumentMatchers.anyString())
     }
 
     /**
@@ -83,6 +88,7 @@ class DeleteHelperTest {
                 .thenReturn(Observable.just(true))
         `when`(media?.displayTitle).thenReturn("Test file")
         `when`(media?.filename).thenReturn("Test file.jpg")
+        `when`(media?.creator).thenReturn("Creator (page does not exist)")
 
         deleteHelper?.makeDeletion(context, media, "Test reason")?.blockingGet()
     }
@@ -97,6 +103,7 @@ class DeleteHelperTest {
                 .thenReturn(Observable.just(false))
         `when`(media?.displayTitle).thenReturn("Test file")
         `when`(media?.filename).thenReturn("Test file.jpg")
+        `when`(media?.creator).thenReturn("Creator (page does not exist)")
 
         deleteHelper?.makeDeletion(context, media, "Test reason")?.blockingGet()
     }
@@ -111,6 +118,24 @@ class DeleteHelperTest {
                 .thenReturn(Observable.just(true))
         `when`(media?.displayTitle).thenReturn("Test file")
         `when`(media?.filename).thenReturn("Test file.jpg")
+        `when`(media?.creator).thenReturn("Creator (page does not exist)")
+
+        deleteHelper?.makeDeletion(context, media, "Test reason")?.blockingGet()
+    }
+
+    @Test(expected = RuntimeException::class)
+    fun makeDeletionForEmptyCreatorName() {
+        `when`(pageEditClient?.prependEdit(ArgumentMatchers.anyString(), ArgumentMatchers.anyString(), ArgumentMatchers.anyString()))
+            .thenReturn(Observable.just(true))
+        `when`(pageEditClient?.appendEdit(ArgumentMatchers.anyString(), ArgumentMatchers.anyString(), ArgumentMatchers.anyString()))
+            .thenReturn(Observable.just(true))
+        `when`(pageEditClient?.edit(ArgumentMatchers.anyString(), ArgumentMatchers.anyString(), ArgumentMatchers.anyString()))
+            .thenReturn(Observable.just(true))
+
+        `when`(media?.displayTitle).thenReturn("Test file")
+        media?.filename="Test file.jpg"
+
+        `when`(media?.getCreator()).thenReturn(null)
 
         deleteHelper?.makeDeletion(context, media, "Test reason")?.blockingGet()
     }