UserDefinedFunctionFactory.getFactory().add("http://example/square", square, new ArrayList<>(square.getVarsMentioned()));
//This test illustrates that if we change the definition of square and call our function again we always
//get the same result with dependencies not preserved because even though the definition of the dependent function
//can change the definition of our function is fully expanded when first defined
Expr cube = new E_Multiply(new E_Function("http://example/square", new ExprList(new ExprVar("x"))), new ExprVar("x"));
UserDefinedFunctionFactory.getFactory().add("http://example/cube", cube, new ArrayList<>(cube.getVarsMentioned()));
UserDefinedFunction f = (UserDefinedFunction) UserDefinedFunctionFactory.getFactory().create("http://example/cube");
f.build("http://example/cube", new ExprList(new NodeValueInteger(2)));
Expr actual = f.getActualExpr();
NodeValue result = actual.eval(BindingFactory.create(), FunctionEnvBase.createTest());
Assert.assertEquals(8, NodeFactoryExtra.nodeToInt(result.asNode()));
//Change the definition of the function we depend on
//This has no effect with preserveDependencies set to false (the default) since we fully expanded the call to the dependent
//function when our outer function was defined
square = new ExprVar("x");
UserDefinedFunctionFactory.getFactory().add("http://example/square", square, new ArrayList<>(square.getVarsMentioned()));
f.build("http://example/cube", new ExprList(new NodeValueInteger(2)));
actual = f.getActualExpr();
result = actual.eval(BindingFactory.create(), FunctionEnvBase.createTest());
Assert.assertEquals(8, NodeFactoryExtra.nodeToInt(result.asNode()));
}