customProperties.put("min_Long", MIN_LONG);
customProperties.put("max_Double", MAX_DOUBLE);
customProperties.put("min_Double", MIN_DOUBLE);
// Check the keys went in
assertTrue(customProperties.containsKey("Schl\u00fcssel \u00e4"));
assertTrue(customProperties.containsKey("Boolean"));
// Check the values went in
assertEquals("Wert \u00e4", customProperties.get("Schl\u00fcssel \u00e4"));
assertEquals(Boolean.TRUE, customProperties.get("Boolean"));