[英]Mockito Mocked Class returns Null
我正在使用Mockito在我的JUnit测试类中模拟一个类,如下所示:
@Before
public void initialize(){
DescribeHiveTable mockObj = Mockito.mock(DescribeHiveTable.class);
String tableName = "clslog_assessments";
String parentDirectoryPath ="src/test/resources/TEST18/RunFiles";
String[] mockFeaturesArray1 = {"user_id","event_id"};
ArrayList<String> mockFeaturesList1 = new ArrayList<String> (Arrays.asList(mockFeaturesArray1));
when(mockObj.describeTable(tableName, parentDirectoryPath)).thenReturn(mockFeaturesList1);
然后,我有了Test方法,该方法随后从内部调用describeTable
方法。 我检查了参数: tableName
和parentDirectoryPath
时describeTable
被称为是相同我在initalize方法定义。
但是,我仍然得到一个空返回值。 我不了解这种行为。 也许我没有正确使用Mockito?
编辑
我的测试方法是这样的:
@Test
public void testComplexFeaturesExistingRun() {
String[] args = {masterConfigPath, runFilesPath, rootDir};
DriverClass driver = new DriverClass();
driver.main(args);
}
所以driver.main调用了describeTable方法,我正在尝试模拟其行为。
编辑2
我的描述蜂巢表类是:
public class DescribeHiveTable {
public ArrayList<String> describeTable(String tableName, String parentDirectoryPath){
String hiveQuery = "'describe " + tableName + "';";
String bashScriptFile = parentDirectoryPath + "/describeTable.sh";
.
.
.
final Process process = builder.start();
InputStream is = process.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line;
while((line=br.readLine())!=null) {
String[] output = line.split("\t");
columnList.add(output[0]);
}
return columnList;
这就是我所说的describe table:
DescribeHiveTable describeTable;
describeTable = new DescribeHiveTable();
ArrayList<String> columnList = describeTable.describeTable(tableName, runFile.getParent());
使用Mockito的方法是
private DescribeHiveTable mockObj; // must be accessible to Test methods
@Before
public void initialize(){
this.mockObj = Mockito.mock(DescribeHiveTable.class);
<etc>
}
@Test
public void testComplexFeaturesExistingRun() {
/* test the objects that are set up to use this.mockObj,
and not the usual type of DescribeHiveTable */
}
注意
describeTable = new DescribeHiveTable();
表示您正在使用的是新的,未模拟的DescribeHiveTable
,而不是mockObj
的嘲笑mockObj
。
但是,似乎您无法控制DriverClass
所使用的DescribeHiveTable
实例? 如果是这样的话
DriverClass
。 要么 describeTable
在DriverClass
与mockObj
。 您可以使用DescribeHiveTable
的模拟形式初始化DriverClass
(提供的DescribeHiveTable
是DriverClass
的实例变量),如下所示:
public class TestClass{
@Mock
DescribeHiveTable mockObj;
// This will create a new instance of DriverClass with a mock of DescribeHiveTable
@InjectMocks
DriverClass driver;
@Before
public void init() {
MockitoAnnotations.initMocks(this);
tableName = "clslog_assessments";
parentDirectoryPath = "src/test/resources/TEST18/RunFiles";
mockFeaturesArray1 = new String[] { "user_id", "event_id" };
mockFeaturesList1 = new ArrayList<String>(
Arrays.asList(mockFeaturesArray1));
when(mockObj.describeTable(tableName, parentDirectoryPath)).thenReturn(
mockFeaturesList1);
}
@Test
public void test() {
// when(methodCall)
assertEquals(mockFeaturesList1, driver.main());
}
}
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