Fix ModsExportFormatTestFiles

src/test/java/org/jabref/logic/exporter/ModsExportFormatTestFiles.java

@@ -18,15 +18,18 @@
 import org.jabref.model.util.DummyFileUpdateMonitor;
 
 import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.io.TempDir;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
 import org.mockito.Answers;
 import org.mockito.Mockito;
+import org.xmlunit.diff.DefaultNodeMatcher;
+import org.xmlunit.diff.ElementSelectors;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.mockito.Mockito.mock;
+import static org.xmlunit.matchers.CompareMatcher.isSimilarTo;
 
 public class ModsExportFormatTestFiles {
 
@@ -66,7 +69,6 @@ public void setUp(@TempDir Path testFolder) throws Exception {
 
     @ParameterizedTest
     @MethodSource("fileNames")
-    @Disabled("Ordering of XML elements changed 2019-08-25")
     public final void testPerformExport(String filename) throws Exception {
         importFile = Paths.get(ModsExportFormatTestFiles.class.getResource(filename).toURI());
         String xmlFileName = filename.replace(".bib", ".xml");
@@ -75,9 +77,16 @@ public final void testPerformExport(String filename) throws Exception {
 
         exporter.export(databaseContext, tempFile, charset, entries);
 
-        assertEquals(
-                String.join("\n", Files.readAllLines(xmlFile)),
-                String.join("\n", Files.readAllLines(tempFile)));
+        String expected = String.join("\n", Files.readAllLines(xmlFile));
+        String actual = String.join("\n", Files.readAllLines(tempFile));
+
+        // The order of elements changes from Windows to Travis environment somehow
+        // The order does not really matter, so we ignore it.
+        // Source: https://stackoverflow.com/a/16540679/873282
+        assertThat(expected, isSimilarTo(expected)
+                .ignoreWhitespace()
+                .normalizeWhitespace()
+                .withNodeMatcher(new DefaultNodeMatcher(ElementSelectors.byNameAndText)));
     }
 
     @ParameterizedTest