A problem about PsiClass.getSuperClass in Junit

I want to write some test cases about PsiClass, but I cann't get a psiClass's superClass in my test case.
Is there something I made mistakes?

I try to wrtie Test Case as follow
1) Create a local Java File "DemoTest.Java"

package myTest;
import myTest.MyBaseClass;
public class myBaseClassImpl extends MyBaseClass {

2) Wrtie a TestCase extends AndroidTestCase

3) Add a Class by text and Configure File in myFixture

myFixture.addClass( "package myTest; public class MyBaseClass{}");

4) Try to get superClass, but it returns null

PsiElement element = myFixture.getFile().findElementAt(myFixture.getEditor().getCaretModel().getOffset());
while (element != null) {
     if (element instanceof PsiClass) {
          PsiClass psiClass = (PsiClas)element;
          PsiClass superClass = psiClass.getSuperClass(); // it returns null
     element = element.parent();

1 comment
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I found that both this two ways can work correctly, but I still didn't know why.

  • Change the case extends LightCodeInsightFixtureTestCase
  • Move the local file DemoTest.Java from testData/DemoTest.java to testData/src/DemoTest.Java, and change the configureByFiles method

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