diff --git a/src/test/java/org/jabref/logic/l10n/LocalizationConsistencyTest.java b/src/test/java/org/jabref/logic/l10n/LocalizationConsistencyTest.java
index 52bdb1e755b..cc73fe68728 100644
--- a/src/test/java/org/jabref/logic/l10n/LocalizationConsistencyTest.java
+++ b/src/test/java/org/jabref/logic/l10n/LocalizationConsistencyTest.java
@@ -43,37 +43,6 @@ public void allFilesMustHaveSameKeys() {
         }
     }
 
-
-    private static class DuplicationDetectionProperties extends Properties {
-
-        private static final long serialVersionUID = 1L;
-
-        private final List<String> duplicates = new LinkedList<>();
-
-
-        public DuplicationDetectionProperties() {
-            super();
-        }
-
-        /**
-         * Overriding the HashTable put() so we can check for duplicates
-         */
-        @Override
-        public synchronized Object put(Object key, Object value) {
-            // Have we seen this key before?
-            if (containsKey(key)) {
-                duplicates.add(String.valueOf(key));
-            }
-
-            return super.put(key, value);
-        }
-
-        public List<String> getDuplicates() {
-            return duplicates;
-        }
-    }
-
-
     @Test
     public void ensureNoDuplicates() {
         for (String bundle : Arrays.asList("JabRef", "Menu")) {
@@ -135,8 +104,7 @@ public void findMissingLocalizationKeys() throws IOException {
 
     @Test
     public void findMissingMenuLocalizationKeys() throws IOException {
-        List<LocalizationEntry> missingKeys = LocalizationParser.find(LocalizationBundleForTest.MENU).stream()
-                .collect(Collectors.toList());
+        Set<LocalizationEntry> missingKeys = LocalizationParser.find(LocalizationBundleForTest.MENU);
 
         assertEquals("DETECTED LANGUAGE KEYS WHICH ARE NOT IN THE ENGLISH MENU FILE\n" +
                 "1. PASTE THESE INTO THE ENGLISH MENU FILE\n" +
@@ -144,7 +112,7 @@ public void findMissingMenuLocalizationKeys() throws IOException {
                 missingKeys.parallelStream()
                         .map(key -> String.format("%s=%s", key.getKey(), key.getKey()))
                         .collect(Collectors.toList()),
-                Collections.<LocalizationEntry>emptyList(), missingKeys);
+                Collections.<LocalizationEntry>emptySet(), missingKeys);
     }
 
     @Test
@@ -188,4 +156,33 @@ public void localizationParameterMustIncludeAString() throws IOException {
         }
     }
 
+    private static class DuplicationDetectionProperties extends Properties {
+
+        private static final long serialVersionUID = 1L;
+
+        private final List<String> duplicates = new LinkedList<>();
+
+
+        public DuplicationDetectionProperties() {
+            super();
+        }
+
+        /**
+         * Overriding the HashTable put() so we can check for duplicates
+         */
+        @Override
+        public synchronized Object put(Object key, Object value) {
+            // Have we seen this key before?
+            if (containsKey(key)) {
+                duplicates.add(String.valueOf(key));
+            }
+
+            return super.put(key, value);
+        }
+
+        public List<String> getDuplicates() {
+            return duplicates;
+        }
+    }
+
 }
diff --git a/src/test/java/org/jabref/logic/l10n/LocalizationParser.java b/src/test/java/org/jabref/logic/l10n/LocalizationParser.java
index a02bee4d0eb..45e63d302cc 100644
--- a/src/test/java/org/jabref/logic/l10n/LocalizationParser.java
+++ b/src/test/java/org/jabref/logic/l10n/LocalizationParser.java
@@ -61,7 +61,7 @@ public static SortedSet<String> findObsolete(LocalizationBundleForTest type) thr
         }
         englishKeys.removeAll(keysInFiles);
 
-        return englishKeys.stream().collect(Collectors.toCollection(TreeSet::new));
+        return new TreeSet<>(englishKeys);
     }
 
     private static Set<LocalizationEntry> findLocalizationEntriesInFiles(LocalizationBundleForTest type) throws IOException {
@@ -195,9 +195,14 @@ public boolean containsKey(String key) {
             }
         };
 
+        PlatformImpl.startup(() -> {
+        });
         try {
-            PlatformImpl.startup(() -> {});
             FXMLLoader loader = new FXMLLoader(path.toUri().toURL(), registerUsageResourceBundle);
+            // We don't want to initialize controller
+            loader.setControllerFactory(controllerType -> null);
+            // Don't check if root is null (needed for custom controls, where the root value is normally set in the FXMLLoader)
+            loader.impl_setStaticLoad(true);
             loader.load();
         } catch (IOException ignore) {
             ignore.printStackTrace();