static Map<String, String> fromSystemProperties()
    {
        final HashMap<String, String> result = new HashMap<>();
        final Properties properties = System.getProperties();
        for (final Map.Entry<Object, Object> entry : properties.entrySet())
        {
            result.put((String)entry.getKey(), (String)entry.getValue());
        }
        return result;
    }
@Test
    void shouldReturnAllSystemProperties()
    {
        final Map<String, String> values = fromSystemProperties();

        assertNotEquals(Collections.emptySet(), values);
    }