@Test
public void getUndefinedFunctions() throws Exception {
String expression = "1 + myFunc(1)";
ExpressionSolver target = new ExpressionSolver(expression);
Set<FunctionInfo> actual = target.getUndefinedFunctions();
Set<FunctionInfo> expected = new HashSet<>(Arrays.asList(new FunctionInfo("myFunc", 1)));
assertThat(actual, is(equalTo(expected)));
}
