final OtpErlangList pathVars = model.getPathVars(project.getWorkspaceProject());
final IPathVariableManager pvm = project.getCorrespondingResource()
.getPathVariableManager();
final String[] pathVariableNames = pvm.getPathVariableNames();
final int n = pathVariableNames.length;
assertEquals(n, pathVars.arity());
final URI path = getTmpURIPath("");
pvm.setURIValue(PV, path);
final OtpErlangList pathVars2 = model.getPathVars(project.getWorkspaceProject());
assertEquals(n + 1, pathVars2.arity());