### Question:
DatabaseConnection extends Input implements Serializable { @Override @Transient @JsonIgnore public String getIdentifier() { return ConfigurationSettingDatabaseConnection.getIdentifier(this.url, this.username, this.system); } DatabaseConnection();  DatabaseConnection(String name);  DatabaseConnection(String url, String username, String password, DbSystem system); @Override DatabaseConnection setId(long id); String getUrl(); DatabaseConnection setUrl(String url); String getUsername(); DatabaseConnection setUsername(String username); String getPassword(); DatabaseConnection setPassword(String password); DbSystem getSystem(); DatabaseConnection setSystem(DbSystem system); String getComment(); DatabaseConnection setComment(String comment); @Override boolean equals(Object o); @Override int hashCode(); @Override @Transient @JsonIgnore String getIdentifier();  }### Answer:
@Test public void testGetIdentifier() { String expectedIdentifier = "url; user; DB2"; DatabaseConnection connection = new DatabaseConnection("url", "user", "pwd", DbSystem.DB2); String actualIdentifier = connection.getIdentifier(); assertEquals(expectedIdentifier, actualIdentifier); }