tools: remove fixer for non-ascii-character ESLint custom rule

The fixer for non-ascii-character does not typidally do the right thing.
It removes the entire node, not the offending character. I discovered
this when it removed the entire contents of a file and I wasn't sure
which auto-fix rule was doing it.

This commit adds a minimal test for the rule. The tests require that
auto-fix results be supplied, so if someone wants to re-add auto-fixing
to the rule, we'll have tests that it does the right thing.

PR-URL: https://github.com/nodejs/node/pull/38413
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-eslint-non-ascii-character.js

@@ -0,0 +1,26 @@
+'use strict';
+
+const common = require('../common');
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+
+common.skipIfEslintMissing();
+
+const RuleTester = require('../../tools/node_modules/eslint').RuleTester;
+const rule = require('../../tools/eslint-rules/non-ascii-character');
+
+new RuleTester().run('non-ascii-characters', rule, {
+  valid: [
+    {
+      code: 'console.log("fhqwhgads")',
+      options: []
+    },
+  ],
+  invalid: [
+    {
+      code: 'console.log("μ")',
+      options: [],
+      errors: [{ message: "Non-ASCII character 'μ' detected." }],
+    },
+  ]
+});

tools/eslint-rules/non-ascii-character.js

@@ -46,12 +46,6 @@ module.exports = (context) => {
       node,
       message,
       loc: sourceCode.getLocFromIndex(offendingCharacterPosition),
-      fix: (fixer) => {
-        return fixer.replaceText(
-          node,
-          suggestion ? `${suggestion}` : ''
-        );
-      }
     });
   };
 
@@ -59,7 +53,3 @@ module.exports = (context) => {
     Program: (node) => reportIfError(node, context.getSourceCode())
   };
 };
-
-module.exports.meta = {
-  fixable: 'code'
-};