assert: fix throws and doesNotThrow stack frames

The stack frames from .throws and .doesNotThrow got included
even though that was not intended.

PR-URL: nodejs#17703
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/assert.js

@@ -709,7 +709,7 @@ function innerThrows(shouldThrow, block, expected, message) {
         expected,
         operator: 'throws',
         message: `Missing expected exception${details}`,
-        stackStartFn: innerThrows
+        stackStartFn: assert.throws
       });
     }
     if (expected && expectedException(actual, expected) === false) {
@@ -723,7 +723,7 @@ function innerThrows(shouldThrow, block, expected, message) {
         expected,
         operator: 'doesNotThrow',
         message: `Got unwanted exception${details}`,
-        stackStartFn: innerThrows
+        stackStartFn: assert.doesNotThrow
       });
     }
     throw actual;

test/parallel/test-assert.js

@@ -603,6 +603,7 @@ testAssertionMessage({ a: NaN, b: Infinity, c: -Infinity },
   } catch (e) {
     threw = true;
     assert.strictEqual(e.message, 'Missing expected exception.');
+    assert.ok(!e.stack.includes('throws'), e.stack);
   }
   assert.ok(threw);
 }
@@ -619,8 +620,8 @@ try {
   assert.strictEqual(1, 2, 'oh no'); // eslint-disable-line no-restricted-syntax
 } catch (e) {
   assert.strictEqual(e.message.split('\n')[0], 'oh no');
-  // Message should not be marked as generated.
-  assert.strictEqual(e.generatedMessage, false);
+  assert.strictEqual(e.generatedMessage, false,
+                     'Message incorrectly marked as generated');
 }
 
 {