Turned exercise 040 into practice

practice/040/answer/impl.ml

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+let is_prime n =
+  let n = abs n in
+  let rec is_not_divisor d =
+    d * d > n || (n mod d <> 0 && is_not_divisor (d + 1)) in
+  n <> 1 && is_not_divisor 2
+
+let goldbach n =
+  let rec aux d =
+    if is_prime d && is_prime (n - d) then (d, n - d)
+    else aux (d + 1)
+  in aux 2

practice/040/answer/test/dune

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+(include_subdirs no)
+(test (name run) (libraries ounit2 ex))

practice/040/answer/test/run.ml

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+module Test = Ex.Make(Ex.Answer)
+
+let () = OUnit2.run_test_tt_main Test.v

practice/040/dune

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+(include_subdirs qualified)
+(library (name ex) (libraries ounit2))

practice/040/dune-project

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+(lang dune 3.7)

practice/040/ex.ml

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+open OUnit2
+
+module type Testable = sig
+  val goldbach : int -> int * int
+end
+
+module Make(Tested: Testable) : sig val v : test end = struct
+  let tests = "Goldbach's conjecture" >::: [
+    "goldbach of 4" >:: (fun _ ->
+      assert_equal (2, 2) (Tested.goldbach 4));
+    "goldbach of 28" >:: (fun _ ->
+      assert_equal (5, 23) (Tested.goldbach 28));
+  ]
+
+  let v = "Tests for Goldbach's Conjecture" >::: [
+    tests
+  ]
+end
+
+module Work : Testable = Work.Impl
+module Answer : Testable = Answer.Impl

practice/040/work/impl.ml

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+let goldbach _ = failwith "goldbach not implemented"

practice/040/work/test/dune

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+(include_subdirs no)
+(test (name run) (libraries ounit2 ex))

practice/040/work/test/run.ml

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+module Test = Ex.Make(Ex.Work)
+
+let () = OUnit2.run_test_tt_main Test.v