Add build test for @notundefined error

Author: cknitt

tests/build_tests/not_undefined_attribute/input.js

@@ -0,0 +1,23 @@
+// @ts-check
+
+import * as assert from "node:assert";
+import { setup } from "#dev/process";
+import { normalizeNewlines } from "#dev/utils";
+
+const { execBuild } = setup(import.meta.dirname);
+
+const out = await execBuild();
+
+assert.equal(
+  normalizeNewlines(out.stdout.slice(out.stdout.indexOf("input.res:2:1-12"))),
+  `input.res:2:1-12
+
+  1 │ @notUndefined
+  2 │ type t = int
+  3 │ 
+
+  @notUndefined can only be used on abstract types
+
+FAILED: cannot make progress due to previous errors.
+`,
+);

tests/build_tests/not_undefined_attribute/input.res

@@ -0,0 +1,2 @@
+@notUndefined
+type t = int

tests/build_tests/not_undefined_attribute/rescript.json

@@ -0,0 +1,5 @@
+{
+  "name": "not_undefined_attribute",
+  "version": "0.1.0",
+  "sources": ["."]
+}