void () { PsiUtil.markAsIdeaProject(getProject(), true); try { myFixture.configureByFile("pluginWithoutVendor_before.xml"); IntentionAction fix = myFixture.findSingleIntention("Specify JetBrains"); myFixture.launchAction(fix); myFixture.checkResultByFile("pluginWithoutVendor_after.xml"); } finally { PsiUtil.markAsIdeaProject(getProject(), false); } }