### Question:
Part_Name_Output_Get extends DataSource { @Override protected int getDataSourceKey() { return 721; } Part_Name_Output_Get(IDataSourceCallback iDataSourceCallback, HttpDataSourceCredentials credentials, String serverName);  Part_Name_Output_Get(IDataSourceCallback iDataSourceCallback, HttpDataSourceCredentials credentials, String serverName,
      boolean useTestServer); protected  Part_Name_Output_Get(IDataSourceCallback iDataSourceCallback, HttpDataSourceCredentials credentials, String serverName,
      boolean useTestServer,
      IDataSourceConnector connector); int getPartKey(); void setPartKey(int partKey);  }### Answer:
@Test public void TestDatSourceKey() { int expectedValue = 721; Part_Name_Output_Get pnog = new Part_Name_Output_Get(null, null, null); assertEquals(expectedValue, pnog.getDataSourceKey()); }