void () { useStandardProviders(); assertStructureEqual(getPackageDirectory(), """ package1 Class1 Class2.java Class2 Class3 Class4.java Form1 Form1.form Form2.form """); getProjectTreeStructure().setProviders(); assertStructureEqual(getPackageDirectory(), """ package1 Class1.java Class2.java Class4.java Form1.form Form1.java Form2.form """); }