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Whitebox makes private methods and classesĪccessible outside their defined scope and visibility. Powermock offers Whitebox utility offers utilities to unit test private methods and private classes using reflection. List obj = Whitebox.invokeMethod(new Util(),"addLanguageClass",programmingLanguages) ĪssertEquals(obj.get(0).getClass().getDeclaredField("languageId").get(obj.get(0)), 1) ĪssertEquals(obj.get(0).getClass().getDeclaredField("languageName").get(obj.get(0)), "Java") ĪssertEquals(obj.get(0).getClass().getDeclaredField("noOfEnrolments").get(obj.get(0)), 100) ProgrammingLanguages = constructor.newInstance(new Util()) įield = programmingLanguages.getClass().getDeclaredField("languageId") įield = programmingLanguages.getClass().getDeclaredField("languageName") įield = programmingLanguages.getClass().getDeclaredField("noOfEnrolments") Object programmingLanguages = new Object() Ĭlass clazz = Whitebox.getInnerClassType(Util.class, "ProgrammingLanguages") Ĭonstructor constructor = Whitebox.getConstructor(clazz,Util.class) Object obj =Whitebox.invokeMethod(new Util(),"createLanguageClass",2,"Sql",240) ĪssertEquals(obj.getClass().getDeclaredField("languageId").get(obj), 2) ĪssertEquals(obj.getClass().getDeclaredField("languageName").get(obj), "Sql") ĪssertEquals(obj.getClass().getDeclaredField("noOfEnrolments").get(obj), void test_addLanguageClass() throws Exception You can also check the tutorial Junit test case on Javaâs thread where I have used Junitâs. #Java reflection get return from method with argument how toObject obj =Whitebox.invokeMethod(new Util(),"getJavaLanguageClass") ĪssertEquals(obj.getClass().getDeclaredField("languageId").get(obj), 1) ĪssertEquals(obj.getClass().getDeclaredField("languageName").get(obj), "Java") ĪssertEquals(obj.getClass().getDeclaredField("noOfEnrolments").get(obj), void test_createLanguageClass() throws Exception The Junit Mockito Verify example will also shows how to resolve the issue Argument passed to verify () is of type and is not a mock, which occurs during the use of Mockitoâs verify () method without spying the object.Whitebox.invokeMethod(new Util(),"addLanguage",languages,"Python") ĪssertEquals(languages.get(3), void test_getLanguageClass() throws Exception List obj = Whitebox.invokeMethod(new Util(),"getLanguages") ĪssertEquals(obj.get(0), void test_addLanguage() throws Exception Letâs analyse in detail where the reflection plays its role: o.getClass ().getMethods () returns an array of the public methods of the class of the object o. Int obj = Whitebox.invokeMethod(new Util(),"getNumber") ĪssertEquals(obj, void test_getLanguages() throws Exception Import class UtilTest void test_getNumber() throws Exception #Java reflection get return from method with argument fullPublic void setLanguageId(int languageId) Full Junit test class to test private methods and classes Private List addLanguageClass(ProgrammingLanguages language) Private ProgrammingLanguages createLanguageClass(int languageId, String languageName, int noOfEnrolments) ProgrammingLanguages languages = new ProgrammingLanguages() Private ProgrammingLanguages getJavaLanguageClass() Private void addLanguage(List languages, String language) This article explains how to test private methods and classes. If unit testing private methods and classes are inevitable for your situation, I am confident that "Don't unit test private methods" is not the answer you want to find. If you have been researching how to unit test private methods and classes, you may have come across various debates about best practices. Full Junit test class to test private methods and classes 13. Unit test private method that accepts private class and returns private class 12. Unit test private method with arguments and returns an inner class 11. Unit test private method that returns an inner class 10. Unit test private method that accepts arguments 9. Unit test private method that returns a list 8. Unit test private method with return value 7. Unit test class with private methods and inner class 3. The following example shows the usage of .get(Object obj) method. NullPointerException â if the specified object is null and the field is an instance field.Ä®xceptionInInitializerError â if the initialization provoked by this method fails. IllegalArgumentException â if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof). IllegalAccessException â if this Field object is enforcing Java language access control and the underlying field is inaccessible. The value of the represented field in object obj primitive values are wrapped in an appropriate object before being returned. Obj â object from which the represented field's value is to be extracted. Throws IllegalArgumentException, IllegalAccessException Declarationįollowing is the declaration for .get(Object obj) method. The value is automatically wrapped in an object if it has a primitive type. The .get(Object obj) method returns the value of the field represented by this Field, on the specified object. ![]()
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