MockBundle bundle = new MockBundle(symName);
Properties props = new Properties();
String header = "HEADER";
String value = "VALUE";
props.put(header, value);
MockServiceReference ref = new MockServiceReference(bundle, props, null);
String out = OsgiStringUtils.nullSafeToString(ref);
assertTrue(out.indexOf(symName) > -1);
assertTrue(out.indexOf(header) > -1);
assertTrue(out.indexOf(value) > -1);
}