Refactor for clean root module and documentation

tests/tutorial_tests.rs

@@ -1,5 +1,5 @@
 use cp_sat::builder::CpModelBuilder;
-use cp_sat::proto::CpSolverStatus;
+use cp_sat::proto::{CpSolverStatus, SatParameters};
 
 #[test]
 fn presentation_problem() {
@@ -57,3 +57,28 @@ fn solving_a_cp_problem() {
     assert!(3 * x_val - 5 * y_val + 7 * z_val <= 45);
     assert!(5 * x_val + 2 * y_val - 6 * z_val <= 37);
 }
+
+#[test]
+fn solve_with_time_limit_sample_sat() {
+    let mut model = CpModelBuilder::default();
+    let domain = [(0, 2)];
+    let x = model.new_int_var_with_name(domain, "x");
+    let y = model.new_int_var_with_name(domain, "y");
+    let z = model.new_int_var_with_name(domain, "z");
+
+    model.add_ne(x, y);
+
+    let mut params = SatParameters::default();
+    params.max_time_in_seconds = Some(10.);
+
+    let response = model.solve_with_parameters(&params);
+    println!("{:?}", response);
+
+    assert_eq!(response.status(), CpSolverStatus::Optimal);
+    let x_val = x.solution_value(&response);
+    let y_val = y.solution_value(&response);
+    let z_val = z.solution_value(&response);
+    println!("x = {}", x_val);
+    println!("y = {}", y_val);
+    println!("z = {}", z_val);
+}