diff --git a/tests/model_based.rs b/tests/model_based.rs
index 8b62874..eed2d01 100644
--- a/tests/model_based.rs
+++ b/tests/model_based.rs
@@ -1,9 +1,6 @@
 //! Model-based tests: traces generated from `spec/planner.qnt` are replayed
 //! against the Rust implementation, and both states are compared after each
 //! step.
-//!
-//! This file is the exercise of step 1: fill in every `TODO` below.
-//! See `docs/tutorial.md` for what each of them is asking for.
 
 use itf::de::{self, As};
 use quint_connect::{Config, Driver, Result, State, Step, quint_run, switch};
@@ -35,7 +32,9 @@ impl State<PlannerDriver> for ModelState {
         let planner = &driver.planner;
         Ok(Self {
             start: planner.start(),
-            // TODO: read the three remaining values out of `planner`.
+            goal: planner.goal(),
+            obstacle: planner.obstacle(),
+            result: planner.result().clone(),
         })
     }
 }
@@ -50,10 +49,9 @@ impl Driver for PlannerDriver {
     type State = ModelState;
 
     fn config() -> Config {
-        // The whole state of the specification lives in a single variable.
+        // The whole state of the specification lives in the `state` variable.
         Config {
-            // TODO: name that variable.
-            state: &["<target variable>"],
+            state: &["state"],
             ..Config::default()
         }
     }
@@ -69,7 +67,8 @@ impl Driver for PlannerDriver {
     fn step(&mut self, step: &Step) -> Result {
         switch!(step {
             init(start, goal, obstacle, blocked) => self.set_inputs(start, goal, obstacle, blocked),
-            // TODO: add an arm for every other action the specification can take.
+            reset(start, goal, obstacle, blocked) => self.set_inputs(start, goal, obstacle, blocked),
+            computePlan => self.planner.compute_plan(),
         })
     }
 }
@@ -94,6 +93,7 @@ impl PlannerDriver {
 ///
 /// Failures report the seed the traces were generated from; set `QUINT_SEED` to
 /// that value to replay exactly the same ones.
-// TODO: name the specification file.
-#[quint_run(spec = "<target spec>", max_samples = 100, max_steps = 20)]
-// TODO: add the test function, which returns the driver to replay the traces through.
+#[quint_run(spec = "spec/planner.qnt", max_samples = 100, max_steps = 20)]
+fn planner_model_based_test() -> impl Driver {
+    PlannerDriver::default()
+}