fix(grader): Display negative numbers with mandatory parens

src/grader/introspection.ml

@@ -183,7 +183,7 @@ let print_value ppf v ty =
                  state := `Undecided ;
                  for i = ofs to ofs + len - 1 do
                    match String.get s i with
-                   | ' ' | '\n' | '\r' | '\t' ->
+                   | '-' | ' ' | '\n' | '\r' | '\t' ->
                        state := `Decided true ;
                        raise Exit
                    | _ ->  ()

tests/README.md

@@ -8,3 +8,5 @@ To run the test suite, please execute `runtests.sh`. It uses docker.
 
 Each directory must contain a `repo` sub-directory, which will be built and launched with learn-ocaml.
 Other sub-directories are named after exercices, and contain different solutions for it. Each solution (for example test.ml) must be provided with the desired output (test.ml.json), which will be compared with the server response.
+
+To update (or generate for the first time) the test.ml.json files, you can execute `runtests.sh set`.

tests/test1/demo/bad_plus.ml.json

@@ -79,7 +79,7 @@
             "text": "Computing"
           },
           {
-            "text": "plus 10 -10",
+            "text": "plus 10 (-10)",
             "display": "code"
           }
         ],
@@ -91,7 +91,7 @@
             "text": "Wrong value"
           },
           {
-            "text": "-100",
+            "text": "(-100)",
             "display": "code"
           }
         ],

tests/test1/demo/demo.ml.json

@@ -79,7 +79,7 @@
             "text": "Computing"
           },
           {
-            "text": "plus 10 -10",
+            "text": "plus 10 (-10)",
             "display": "code"
           }
         ],

tests/test1/demo/demo2.ml.json

@@ -79,7 +79,7 @@
             "text": "Computing"
           },
           {
-            "text": "plus 10 -10",
+            "text": "plus 10 (-10)",
             "display": "code"
           }
         ],
@@ -155,7 +155,7 @@
             "text": "Computing"
           },
           {
-            "text": "minus 4 -2",
+            "text": "minus 4 (-2)",
             "display": "code"
           }
         ],
@@ -191,7 +191,7 @@
             "text": "Correct value"
           },
           {
-            "text": "-10",
+            "text": "(-10)",
             "display": "code"
           }
         ],

tests/test_negative_int/int_exo/correct.ml

@@ -0,0 +1 @@
+let aff = fun a b x -> a * x + b

tests/test_negative_int/int_exo/correct.ml.json

@@ -0,0 +1,78 @@
+[
+  {
+    "section": [
+      {
+        "text": "Function:"
+      },
+      {
+        "text": "aff",
+        "display": "code"
+      }
+    ],
+    "contents": [
+      {
+        "message": [
+          {
+            "text": "Found"
+          },
+          {
+            "text": "aff",
+            "display": "code"
+          },
+          {
+            "text": "with compatible type."
+          }
+        ],
+        "result": "informative"
+      },
+      {
+        "message": [
+          {
+            "text": "Computing"
+          },
+          {
+            "text": "aff 2 (-1) 5",
+            "display": "code"
+          }
+        ],
+        "result": "informative"
+      },
+      {
+        "message": [
+          {
+            "text": "Correct value"
+          },
+          {
+            "text": "9",
+            "display": "code"
+          }
+        ],
+        "result": 1
+      },
+      {
+        "message": [
+          {
+            "text": "Computing"
+          },
+          {
+            "text": "aff (-2) 1 5",
+            "display": "code"
+          }
+        ],
+        "result": "informative"
+      },
+      {
+        "message": [
+          {
+            "text": "Correct value"
+          },
+          {
+            "text": "(-9)",
+            "display": "code"
+          }
+        ],
+        "result": 1
+      }
+    ]
+  }
+]

tests/test_negative_int/repo/exercises/index.json

@@ -0,0 +1,5 @@
+{ "learnocaml_version": "1",
+  "groups":
+  { "demo":
+    { "title": "Test negative_int",
+      "exercises": [ "int_exo" ] } } }

tests/test_negative_int/repo/exercises/int_exo/descr.md

@@ -0,0 +1,3 @@
+# Test negative_int
+
+This exercise is just a regression test with pretty-printing negative `int`s.

tests/test_negative_int/repo/exercises/int_exo/meta.json

@@ -0,0 +1,2 @@
+{"learnocaml_version":"1","kind":"exercise","stars":0,
+ "title":"Test negative_int"}

tests/test_negative_int/repo/exercises/int_exo/solution.ml

@@ -0,0 +1 @@
+let aff a b x = a * x + b

tests/test_negative_int/repo/exercises/int_exo/test.ml

@@ -0,0 +1,13 @@
+open Test_lib
+open Report
+
+let () =
+  set_result @@
+  ast_sanity_check code_ast @@ fun () ->
+  [ Section
+      ([ Text "Function:" ; Code "aff" ],
+       let prot = [%funty: int -> int -> int -> int] in
+       test_function_against_solution ~gen:(0) prot "aff"
+         [2 @: (-1) @:!! 5;
+          (-2) @: 1 @:!! 5])
+  ]