test: add details in assertions in test-vm-context

PR-URL: #16116
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

Author: burgerboydaddy

test/parallel/test-vm-context.js

@@ -56,10 +56,10 @@ try {
 }catch(e){
 gh1140Exception=e;
 assert.ok(/expected-filename/.test(e.stack),
-'expected appearance of filename in Error stack');
+`expected appearance of filename in Error stack: ${e.stack}`);
 }
-assert.ok(gh1140Exception,
-'expected exception from runInContext signature test');
+// This is outside of catch block to confirm catch block ran.
+assert.strictEqual(gh1140Exception.toString(),'Error');
 
 // GH-558, non-context argument segfaults / raises assertion
 constnonContextualSandboxErrorMsg=
@@ -90,18 +90,22 @@ Object.defineProperty(ctx, 'b', { configurable: false });
 ctx=vm.createContext(ctx);
 assert.strictEqual(script.runInContext(ctx),false);
 
-// Error on the first line of a module should
-// have the correct line and column number
-assert.throws(()=>{
-vm.runInContext(' throw new Error()',context,{
-filename: 'expected-filename.js',
-lineOffset: 32,
-columnOffset: 123
-});
-},(err)=>{
-return/^\^/m.test(err.stack)&&
-/expected-filename\.js:33:131/.test(err.stack);
-},'Expected appearance of proper offset in Error stack');
+// Error on the first line of a module should have the correct line and column
+// number.
+{
+letstack=null;
+assert.throws(()=>{
+vm.runInContext(' throw new Error()',context,{
+filename: 'expected-filename.js',
+lineOffset: 32,
+columnOffset: 123
+});
+},(err)=>{
+stack=err.stack;
+return/^\^/m.test(stack)&&
+/expected-filename\.js:33:131/.test(stack);
+},`stack not formatted as expected: ${stack}`);
+}
 
 // https://github.com/nodejs/node/issues/6158
 ctx=newProxy({},{});