Add tests for code coverage (#10309)

* @test for AuthorListTest.java

* @test for FieldComparatorTest.java

---------

Co-authored-by: Oliver Kopp <[email protected]>

Author: Luggas4you

src/test/java/org/jabref/logic/bibtex/comparator/FieldComparatorTest.java

@@ -250,4 +250,15 @@ private static Stream<Arguments> nullTests() {
                 Arguments.of(1, "value", null)
         );
     }
+
+    @Test
+    public void compareAuthorField() throws Exception {
+        FieldComparator comparator = new FieldComparator(StandardField.AUTHOR);
+        BibEntry bigger = new BibEntry()
+                .withField(StandardField.AUTHOR, "Freund, Lucas");
+        BibEntry smaller = new BibEntry()
+                .withField(StandardField.AUTHOR, "Gärtner, Lara");
+
+        assertEquals(1, comparator.compare(smaller, bigger));
+    }
 }

src/test/java/org/jabref/model/entry/AuthorListTest.java

@@ -1213,4 +1213,16 @@ public void hashCodeNotConstant() {
         AuthorList secondAuthorList = AuthorList.of(new Author("B", null, null, null, null));
         assertNotEquals(firstAuthorList.hashCode(), secondAuthorList.hashCode());
     }
+
+    @Test
+    public void getAsLastFirstFirstLastNamesWithAndEmptyAuthor() {
+        assertEquals("",
+                EMPTY_AUTHOR.getAsLastFirstFirstLastNamesWithAnd(true));
+    }
+
+    @Test
+    public void getAsLastFirstFirstLastNamesWithAndMultipleAuthors() {
+        assertEquals("al-Khw{\\={a}}rizm{\\={i}}, M. and C. B{\\\"o}hm and K. G{\\\"{o}}del",
+                THREE_AUTHORS_WITH_LATEX.getAsLastFirstFirstLastNamesWithAnd(true));
+    }
 }