✅ add eslint-node tests

Author: dudeofawesome

eslint-config-node/package.json

@@ -17,12 +17,18 @@
   "license": "MIT",
   "main": ".eslintrc.yaml",
   "scripts": {
-    "test": "echo 'No tests'; exit 0"
+    "test": "node --require ts-node/register --test test/index.ts"
   },
   "dependencies": {
     "@shopify/eslint-plugin": "^43.0.0"
   },
   "peerDependencies": {
     "@dudeofawesome/eslint-config": "^1.0.0"
+  },
+  "devDependencies": {
+    "@swc/core": "^1.3.87",
+    "@types/eslint": "^8.44.2",
+    "@types/node": "^20.6.3",
+    "ts-node": "^10.9.1"
   }
 }

eslint-config-node/test/.eslintrc.yaml

@@ -0,0 +1,6 @@
+root: true
+extends:
+  - '@dudeofawesome'
+  - '@dudeofawesome/node'
+parserOptions:
+  ecmaVersion: 2022

eslint-config-node/test/index.ts

@@ -0,0 +1,52 @@
+import { describe, it } from 'node:test';
+import { strictEqual } from 'node:assert';
+import { ESLint } from 'eslint';
+
+const linter = new ESLint({
+  overrideConfigFile: `${__dirname}/.eslintrc.yaml`,
+});
+
+describe('eslint-config-node', () => {
+  describe('passes', () => {
+    it(`should pass radix`, async () =>
+      linter.lintText(`parseInt('10');\n`).then(noLintMessage));
+  });
+  describe('fails', () => {
+    it(`should fail no-console`, () =>
+      testRuleFail(linter, `console.log('foo');\n`, 'no-console'));
+
+    it(`should fail eqeqeq`, () =>
+      testRuleFail(linter, `if (Number == true) Number();\n`, 'eqeqeq'));
+  });
+});
+
+async function testRuleFail(linter: ESLint, code: string, ruleId: string) {
+  const res = await linter.lintText(code);
+  singleLintMessage(res);
+  strictEqual(res[0].source, code);
+  strictEqual(res[0].messages[0].ruleId, ruleId);
+}
+
+function noLintMessage(lint_results: ESLint.LintResult[]) {
+  strictEqual(lint_results.length, 1, `Expected there to be no lint results.`);
+  strictEqual(
+    lint_results[0].errorCount,
+    0,
+    `Expected there to be no lint results.`,
+  );
+}
+
+function singleLintMessage(lint_results: ESLint.LintResult[]) {
+  strictEqual(
+    lint_results.length,
+    1,
+    `Expected there to be only one lint result.`,
+  );
+  strictEqual(
+    lint_results[0].messages.length,
+    1,
+    `Expected there to be one lint message, but there were ${
+      lint_results[0].messages.length
+    }: ${lint_results[0].messages.map((m) => m.message)}`,
+  );
+}