Fix the BlockDecorator to throw the AsssertionError, if any.

src/main/java/space/kklochko/simple_jbdd/tests/commands/decorators/BlockDecorator.java

@@ -28,6 +28,11 @@ public class BlockDecorator<T extends Test> extends AbstractDecorator<T> {
             method.invoke(getCommand().getObject());
             return true;
         } catch (InvocationTargetException e) {
+            Throwable exception = e.getCause();
+
+            if(exception instanceof AssertionError)
+                throw (AssertionError) exception;
+
             System.err.println(e.getMessage());
             throw new RuntimeException(e);
         } catch (IllegalAccessException e) {