Resolve request changes (#4)

* test: enhanced RemoveLinksToNotExistentFilesTest

* test: add real content

* test: change structure

* test: added expectedChanges

* test: added a third test to RemoveLinksToNotExistentFilesTest

* refactor: removed unnecessary toString

* style: removed a whitespace

* refactor: checkstyle formatting.

formatted files according to checkstyle plugin.

* refactor: replaced .get(0) with .getFirst() for first accessing element of List.

Changed was required from ./gradlew rewriteDryRun

---------

Co-authored-by: burcukilic <[email protected]>

src/test/java/org/jabref/logic/cleanup/RemoveLinksToNotExistentFilesTest.java

@@ -105,7 +105,7 @@ void deleteFileInMultipleLinkedEntry() {
         fileBefore.toFile().delete();
         List<FieldChange> changes = removeLinks.cleanup(entry);
 
-        assertEquals(expectedChange, changes.get(0));
+        assertEquals(expectedChange, changes.getFirst());
         assertEquals(expectedEntry, entry);
     }
 
@@ -159,7 +159,7 @@ void deleteLinkedFile() {
         fileBefore.toFile().delete();
         List<FieldChange> changes = removeLinks.cleanup(entry);
 
-        assertEquals(expectedChange, changes.get(0));
+        assertEquals(expectedChange, changes.getFirst());
         assertEquals(expectedEntry, entry);
     }
 }