fix test case for simple-xml

Author: Sebastian Hoß

storage-units-simple/src/main/java/wtf/metio/storageunits/simple/StorageUnitConverter.java

@@ -17,7 +17,7 @@ public final class StorageUnitConverter implements Converter<StorageUnit<?>> {
 
     @Override
     public void write(final OutputNode outputNode, final StorageUnit<?> storageUnit) throws Exception {
-        outputNode.setValue(storageUnit.toString());
+        outputNode.setValue(storageUnit.inByte().toString());
     }
 
     @Override

storage-units-simple/src/test/java/wtf/metio/storageunits/simple/StorageUnitConverterTest.java

@@ -33,7 +33,7 @@ void shouldConvertStorageUnitToString() throws Exception {
         final var unit = StorageUnits.kibibyte(2);
         converter.write(output, unit);
 
-        Mockito.verify(output).setValue("2 KiB");
+        Mockito.verify(output).setValue("2048");
     }
 
 }