assert: wrap validation function errors

This makes sure that validation function used by `assert.throws` and
`assert.rejects` always throw validatin errors instead of rethrowing
the received error.

That should improve the debugging experience for developers since
they have a better context where the error is coming from and they
also get to know what triggered it.

PR-URL: https://github.com/nodejs/node/pull/28263
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

2 files changed, 32 insertions, 0 deletions

diff --git a/test/parallel/test-assert-async.js b/test/parallel/test-assert-async.js
index 8aad1d865c..45447d4563 100644
--- a/test/parallel/test-assert-async.js
+++ b/test/parallel/test-assert-async.js
@@ -66,6 +66,21 @@ const invalidThenableFunc = () => {
       code: 'ERR_INVALID_RETURN_VALUE'
     })
   );
+
+  const err = new Error('foobar');
+  const validate = () => { return 'baz'; };
+  promises.push(assert.rejects(
+    () => assert.rejects(Promise.reject(err), validate),
+    {
+      message: 'The "validate" validation function is expected to ' +
+               "return \"true\". Received 'baz'",
+      code: 'ERR_ASSERTION',
+      actual: err,
+      expected: validate,
+      name: 'AssertionError',
+      operator: 'rejects',
+    }
+  ));
 }
 
 {
diff --git a/test/parallel/test-assert.js b/test/parallel/test-assert.js
index 13f9d6427b..9c59227a78 100644
--- a/test/parallel/test-assert.js
+++ b/test/parallel/test-assert.js
@@ -1326,3 +1326,20 @@ assert.throws(
              'Received "[Array]"'
   }
 );
+
+{
+  const err = new TypeError('foo');
+  const validate = (() => () => ({ a: true, b: [ 1, 2, 3 ] }))();
+  assert.throws(
+    () => assert.throws(() => { throw err; }, validate),
+    {
+      message: 'The validation function is expected to ' +
+              `return "true". Received ${inspect(validate())}`,
+      code: 'ERR_ASSERTION',
+      actual: err,
+      expected: validate,
+      name: 'AssertionError',
+      operator: 'throws',
+    }
+  );
+}