test: increase error information in test-cli-syntax-*

If there is an error, but not the error code the test expects, display
more information about the error.

PR-URL: #25021
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Shelley Vohr <codebytere@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>

test/sequential/test-cli-syntax-bad.js

@@ -32,7 +32,8 @@ const syntaxErrorRE = /^SyntaxError: \b/m;
     const cmd = [node, ..._args].join(' ');
     exec(cmd, common.mustCall((err, stdout, stderr) => {
       assert.strictEqual(err instanceof Error, true);
-      assert.strictEqual(err.code, 1);
+      assert.strictEqual(err.code, 1,
+                         `code ${err.code} !== 1 for error:\n\n${err}`);
 
       // no stdout should be produced
       assert.strictEqual(stdout, '');

test/sequential/test-cli-syntax-file-not-found.js

@@ -33,7 +33,8 @@ const notFoundRE = /^Error: Cannot find module/m;
       // stderr should have a module not found error message
       assert(notFoundRE.test(stderr), `${notFoundRE} === ${stderr}`);
 
-      assert.strictEqual(err.code, 1);
+      assert.strictEqual(err.code, 1,
+                         `code ${err.code} !== 1 for error:\n\n${err}`);
     }));
   });
 });

test/sequential/test-cli-syntax-require.js

@@ -20,7 +20,8 @@ const syntaxErrorRE = /^SyntaxError: \b/m;
     const cmd = [node, ...args].join(' ');
     exec(cmd, common.mustCall((err, stdout, stderr) => {
       assert.strictEqual(err instanceof Error, true);
-      assert.strictEqual(err.code, 1);
+      assert.strictEqual(err.code, 1,
+                         `code ${err.code} !== 1 for error:\n\n${err}`);
 
       // no stdout should be produced
       assert.strictEqual(stdout, '');