assert: fix generatedMessage

The generatedMessage was wrong in case simple assert was used and
a message was auto generated. This fixed the TODO.

PR-URL: https://github.com/nodejs/node/pull/18322
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

lib/assert.js

@@ -204,7 +204,10 @@ function innerOk(args, fn) {
   var [value, message] = args;
 
   if (!value) {
+    let generatedMessage = false;
+
     if (args.length === 0) {
+      generatedMessage = true;
       message = 'No value argument passed to `assert.ok()`';
     } else if (message == null) {
       // Use the call as error message if possible.
@@ -222,20 +225,22 @@ function innerOk(args, fn) {
       const call = err.stack[0];
       Error.prepareStackTrace = tmpPrepare;
 
-      // TODO(BridgeAR): fix the "generatedMessage property"
-      // Since this is actually a generated message, it has to be
-      // determined differently from now on.
-
       // Make sure it would be "null" in case that is used.
       message = getErrMessage(call) || message;
+      generatedMessage = true;
+    } else if (message instanceof Error) {
+      throw message;
     }
-    innerFail({
+
+    const err = new AssertionError({
       actual: value,
       expected: true,
       message,
       operator: '==',
       stackStartFn: fn
     });
+    err.generatedMessage = generatedMessage;
+    throw err;
   }
 }
 

test/parallel/test-assert.js

@@ -919,6 +919,7 @@ common.expectsError(
   {
     code: 'ERR_ASSERTION',
     type: assert.AssertionError,
+    generatedMessage: true,
     message: `The expression evaluated to a falsy value:${EOL}${EOL}  ` +
              `assert.ok(null)${EOL}`
   }
@@ -928,6 +929,7 @@ common.expectsError(
   {
     code: 'ERR_ASSERTION',
     type: assert.AssertionError,
+    generatedMessage: true,
     message: `The expression evaluated to a falsy value:${EOL}${EOL}  ` +
              `assert(typeof 123 === 'string')${EOL}`
   }
@@ -1011,7 +1013,8 @@ common.expectsError(
   {
     code: 'ERR_ASSERTION',
     type: assert.AssertionError,
-    message: '0 == true'
+    message: '0 == true',
+    generatedMessage: true
   }
 );
 
@@ -1020,7 +1023,8 @@ common.expectsError(
   {
     code: 'ERR_ASSERTION',
     type: assert.AssertionError,
-    message: 'test'
+    message: 'test',
+    generatedMessage: false
   }
 );