cleanup: remove println from tests

Author: Pfeil

src/test/java/edu/kit/datamanager/ro_crate/entities/data/DataEntityTest.java

@@ -214,7 +214,6 @@ void testMixedArrayProperties() {
         DataEntity entity = new DataEntityBuilder()
                 .addProperty(propertyName, propertyValue)
                 .build();
-        System.out.println(entity.getProperty(propertyName));
         assertEquals(propertyValue, entity.getProperty(propertyName));
     }
 
@@ -225,7 +224,6 @@ void testNestedArrayProperties(ArrayNode propertyValue) {
         DataEntity entity = new DataEntityBuilder()
                 .addProperty(propertyName, propertyValue)
                 .build();
-        System.out.println(entity.getProperty(propertyName));
         assertNull(entity.getProperty(propertyName));
     }