3 files changed, 76 insertions, 0 deletions
diff --git a/ocaml/test/year2025/day01/part02/dune b/ocaml/test/year2025/day01/part02/dune
new file mode 100644
index 0000000..52cff9d
--- /dev/null
+++ b/ocaml/test/year2025/day01/part02/dune
@@ -0,0 +1,11 @@
+(tests
+ (names
+   test_dial
+   test_solver)
+ (libraries
+   year2025
+   alcotest
+   qcheck-core
+   qcheck-alcotest)
+ (action (run %{test} -e))
+ (modes byte exe))
diff --git a/ocaml/test/year2025/day01/part02/test_dial.ml b/ocaml/test/year2025/day01/part02/test_dial.ml
new file mode 100644
index 0000000..2d09635
--- /dev/null
+++ b/ocaml/test/year2025/day01/part02/test_dial.ml
@@ -0,0 +1,42 @@
+open Year2025.Day01.Part02.Dial
+open Year2025.Day01.Part02.Turner
+
+let test_start () =
+  Alcotest.(check int) "incorrect starting state" 50 (Dial.to_int Dial.start)
+
+let test_turn errmsg exp dir =
+  Alcotest.(check int)
+    errmsg exp
+    (Dial.to_int (fst (Turner.turn Dial.start 0 dir)))
+
+let test_turn_left_one () =
+  test_turn "incorrect result when turning left one step" 49 (Dial.Left 1)
+
+let test_turn_left_100 () =
+  test_turn "incorrect result when turning left 100 steps" 50 (Dial.Left 100)
+
+let test_turn_right_one () =
+  test_turn "incorrect result when turning right one step" 51 (Dial.Right 1)
+
+let test_turn_right_100 () =
+  test_turn "incorrect result when turning right 100 steps" 50 (Dial.Right 100)
+
+let test_zero_count errmsg exp dir =
+  Alcotest.(check int) errmsg exp (snd (Turner.turn Dial.start 0 dir))
+
+let test_zero_count_right_1000 () =
+  test_zero_count "zero MUST be counted each time it is passed" 10
+    (Dial.Right 1000)
+
+let () =
+  let open Alcotest in
+  run "D01p02"
+    [ ("initial-state", [test_case "starting state" `Quick test_start])
+    ; ( "turning-dial-regression"
+      , [ test_case "turning left one step" `Quick test_turn_left_one
+        ; test_case "turning right one step" `Quick test_turn_right_one
+        ; test_case "turning left 100 steps" `Quick test_turn_left_100
+        ; test_case "turning right 100 steps" `Quick test_turn_right_100 ] )
+    ; ( "zero-count"
+      , [ test_case "zero count after turning right 1000 steps" `Quick
+            test_zero_count_right_1000 ] ) ]
diff --git a/ocaml/test/year2025/day01/part02/test_solver.ml b/ocaml/test/year2025/day01/part02/test_solver.ml
new file mode 100644
index 0000000..c4c1123
--- /dev/null
+++ b/ocaml/test/year2025/day01/part02/test_solver.ml
@@ -0,0 +1,23 @@
+open Year2025.Day01.Part02.Solver
+
+let example_data = {|L68
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82|}
+
+let test_full_given_example () =
+  Alcotest.(check int)
+    "full given example" 6
+    (match solve example_data () with Error _ -> 0 | Ok ans -> ans)
+
+let () =
+  let open Alcotest in
+  run "D01p02"
+    [ ( "given-example"
+      , [test_case "full given example" `Quick test_full_given_example] ) ]