Compare classes, not classnames in tests (#9014)

* Use instanceof to compare types, not class names

* Use instanceof in FileDataProviderFactoryTest

Instead of comparing class names, the tests assert that
`result instanceof Class` (for each appropriate class).

src/test/java/edu/harvard/iq/dataverse/api/SwordIT.java

@@ -462,7 +462,7 @@ public void testCreateAndDeleteDatasetInRoot() {
             assertNull(attemptToGetFileId);
         } catch (Exception ex) {
             System.out.println("We expect an exception here because we can no longer find the file because deleted it: " + ex);
-            assertTrue(ex.getClass().getName().equals(ArrayIndexOutOfBoundsException.class.getName()));
+            assertTrue(ex instanceof ArrayIndexOutOfBoundsException);
         }
 
         String newTitle = "A New Hope";

src/test/java/edu/harvard/iq/dataverse/util/bagit/data/FileDataProviderFactoryTest.java

@@ -23,21 +23,21 @@ public class FileDataProviderFactoryTest {
     public void should_return_FolderDataProvider_when_parameter_is_path() {
         FileDataProvider result = target.getFileDataProvider(Path.of(UUID.randomUUID().toString()));
 
-        MatcherAssert.assertThat(result.getClass().getName(), Matchers.is(FolderDataProvider.class.getName()));
+        MatcherAssert.assertThat("should return FolderDataProvider when parameter is path", result instanceof FolderDataProvider);
     }
 
     @Test
     public void should_return_ZipFileDataProvider_when_parameter_is_file() throws IOException {
         FileDataProvider result = target.getFileDataProvider(Path.of(FIXTURE_DIRECTORY, "FileDataProviderFactoryTest.zip").toFile());
 
-        MatcherAssert.assertThat(result.getClass().getName(), Matchers.is(ZipFileDataProvider.class.getName()));
+        MatcherAssert.assertThat("should return ZipFileDataProvider when parameter is file", result instanceof ZipFileDataProvider);
     }
 
     @Test
     public void should_return_DataFileDataProvider_when_parameter_is_datafiles() {
         FileDataProvider result = target.getFileDataProvider("test-name", Collections.emptyList());
 
-        MatcherAssert.assertThat(result.getClass().getName(), Matchers.is(DataFileDataProvider.class.getName()));
+        MatcherAssert.assertThat("should return DataFileDataProvider when parameter is datafiles", result instanceof DataFileDataProvider);
     }
 
 }