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Mocking / interrupting private class variables without getter and setter methods

I recently started working on TDD for a project exit and ran into several issues, one of which is mentioned below

I have a private variable that needs to be mocked at the test class, and the variable looks below

private Class<XYZ> cls = XYZ.class;

later this cls variable is used as a measure for one of the methods as className

private List create(Class className, Object objectTO,   List<String> names)

I know that private variables can be mocked and I mocked a private variable in my test case by following these steps.

  • Announced java.lang.reflect.Field;
  • Field field = PowerMockito.field(XYZ.class,"cls");
  • field.set(XYZ.class, "objectOfXYZClass");

When I run my test class, I get below the error

java.lang.IllegalArgumentException: Can not set java.lang.Class field com.tools.XYZ.cls to java.lang.Class
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:164)
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:168)
at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:55)
at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:75)
at java.lang.reflect.Field.set(Field.java:680)

Please someone can help me with this and let me know what I am missing.

PS: @preparefortest , @runwith(powermockrunner.class)

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field.set(instanceOfClassXYZ, "")

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field.setAccessible(true);
+1

Source: https://habr.com/ru/post/1652143/

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