PsiFile file = myFixture.configureByText("aaa.erl", "-module(aaa).\nfoo() -> ok.");
PsiDirectory containingDirectory = file.getContainingDirectory();
assert containingDirectory != null;
String newName = "bbb.erl";
CopyFilesOrDirectoriesHandler.copyToDirectory(file, newName, containingDirectory);
PsiFile copiedFile = containingDirectory.findFile(newName);
assert copiedFile != null;
assertEquals(copiedFile.getText(), "-module(bbb).\nfoo() -> ok.");
}
}