### Question:
Container_Get1 extends DataSource { @Override protected int getDataSourceKey() { return 6455; } Container_Get1(IDataSourceCallback callback, HttpDataSourceCredentials credentials, String serverName);  Container_Get1(IDataSourceCallback callback, HttpDataSourceCredentials credentials, String serverName, boolean test); protected  Container_Get1(IDataSourceCallback callback, HttpDataSourceCredentials credentials, String serverName, boolean test, IDataSourceConnector connector); String getSerialNo(); void setSerialNo(String serialNo);  }### Answer:
@Test public void getDataSourceKey() { int expected = 6455; int output = new Container_Get1(null, null, null).getDataSourceKey(); assertEquals(expected, output); }