diff --git a/tests/test_negative_int/int_exo/correct.ml b/tests/test_negative_int/int_exo/correct.ml
new file mode 100644
index 000000000..d1b742e95
--- /dev/null
+++ b/tests/test_negative_int/int_exo/correct.ml
@@ -0,0 +1 @@
+let aff = fun a b x -> a * x + b
diff --git a/tests/test_negative_int/int_exo/correct.ml.json b/tests/test_negative_int/int_exo/correct.ml.json
new file mode 100644
index 000000000..24f6d418a
--- /dev/null
+++ 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
+      }
+    ]
+  }
+]
diff --git a/tests/test_negative_int/repo/exercises/index.json b/tests/test_negative_int/repo/exercises/index.json
new file mode 100644
index 000000000..cb91e8ba2
--- /dev/null
+++ b/tests/test_negative_int/repo/exercises/index.json
@@ -0,0 +1,5 @@
+{ "learnocaml_version": "1",
+  "groups":
+  { "demo":
+    { "title": "Test negative_int",
+      "exercises": [ "int_exo" ] } } }
diff --git a/tests/test_negative_int/repo/exercises/int_exo/descr.md b/tests/test_negative_int/repo/exercises/int_exo/descr.md
new file mode 100644
index 000000000..cdcdb3e1f
--- /dev/null
+++ b/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.
diff --git a/tests/test_negative_int/repo/exercises/int_exo/meta.json b/tests/test_negative_int/repo/exercises/int_exo/meta.json
new file mode 100644
index 000000000..3ed130575
--- /dev/null
+++ b/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"}
diff --git a/tests/test_negative_int/repo/exercises/int_exo/prelude.ml b/tests/test_negative_int/repo/exercises/int_exo/prelude.ml
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/test_negative_int/repo/exercises/int_exo/prepare.ml b/tests/test_negative_int/repo/exercises/int_exo/prepare.ml
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/test_negative_int/repo/exercises/int_exo/solution.ml b/tests/test_negative_int/repo/exercises/int_exo/solution.ml
new file mode 100644
index 000000000..ce9649c8b
--- /dev/null
+++ b/tests/test_negative_int/repo/exercises/int_exo/solution.ml
@@ -0,0 +1 @@
+let aff a b x = a * x + b
diff --git a/tests/test_negative_int/repo/exercises/int_exo/template.ml b/tests/test_negative_int/repo/exercises/int_exo/template.ml
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/test_negative_int/repo/exercises/int_exo/test.ml b/tests/test_negative_int/repo/exercises/int_exo/test.ml
new file mode 100644
index 000000000..131a71309
--- /dev/null
+++ 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])
+  ]