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+++ b/ocaml/test/year2025/day04/part01/test_solver.ml
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+open Year2025.Day04.Part01.Solver
+
+let example =
+ {|..@@.@@@@.
+@@@.@.@.@@
+@@@@@.@.@@
+@.@@@@..@.
+@@.@@@@.@@
+.@@@@@@@.@
+.@.@.@.@@@
+@.@@@.@@@@
+.@@@@@@@@.
+@.@.@@@.@.|}
+
+let test_input_to_matrix have want () =
+ Alcotest.(check int) "number of rolls of paper that are accessible" want
+ @@ match solve have () with Error _ -> 0 | Ok ans -> ans
+
+let () =
+ let open Alcotest in
+ run "D04p01"
+ [ ( "given-example"
+ , [test_case "full example" `Quick @@ test_input_to_matrix example 13] )
+ ]