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POMockito Mocked Class returns Null
 

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    <p>I am using Mockito to mock a class in my JUnit test class as follows:</p> <pre><code>@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&lt;String&gt; mockFeaturesList1 = new ArrayList&lt;String&gt; (Arrays.asList(mockFeaturesArray1)); when(mockObj.describeTable(tableName, parentDirectoryPath)).thenReturn(mockFeaturesList1); </code></pre> <p>Then I have my Test method, which subsequently calls the <code>describeTable</code> method from within. I checked that the arguments: <code>tableName</code> and <code>parentDirectoryPath</code> when <code>describeTable</code> is being called are same as those I have defined in the initalize method. </p> <p>However, I still get a null return value. I don't understand this behavior. Maybe I'm not using Mockito correctly?</p> <p><strong>EDIT</strong></p> <p>My Test method is something like:</p> <pre><code>@Test public void testComplexFeaturesExistingRun() { String[] args = {masterConfigPath, runFilesPath, rootDir}; DriverClass driver = new DriverClass(); driver.main(args); } </code></pre> <p>So driver.main calls the describeTable method, whose behavior I'm trying to mock.</p> <p><strong>EDIT 2</strong></p> <p>My describe hive table class is :</p> <pre><code>public class DescribeHiveTable { public ArrayList&lt;String&gt; 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; </code></pre> <p>This is how I'm calling describe table:</p> <pre><code>DescribeHiveTable describeTable; describeTable = new DescribeHiveTable(); ArrayList&lt;String&gt; columnList = describeTable.describeTable(tableName, runFile.getParent()); </code></pre>
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    1. COI'm not seeing where your `mockObj`, declared as a local variable of `initialize()`, is leaving the scope of that method. Is the problem that you're not publishing `mockObj` (in an instance field of the class) and therefore not using the mock object that you've so carefully constructed?
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      1. USJeremy
    2. COcan you show us the code you are using in the test method ?
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      1. USDebojit Saikia
    3. CO@DebojitSaikia, added my test method code
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      1. USChaos
 

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