test: add tests for eslint rules

This adds tests for the custom eslint rules in this repository, using
the `RuleTester` test utility bundled with eslint.

PR-URL: https://github.com/nodejs/node/pull/16138
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/test/parallel/test-eslint-prefer-assert-methods.js b/test/parallel/test-eslint-prefer-assert-methods.js
new file mode 100644
index 0000000000..2129c08322
--- /dev/null
+++ b/test/parallel/test-eslint-prefer-assert-methods.js
@@ -0,0 +1,37 @@
+'use strict';
+
+require('../common');
+
+const RuleTester = require('../../tools/eslint').RuleTester;
+const rule = require('../../tools/eslint-rules/prefer-assert-methods');
+
+new RuleTester().run('prefer-assert-methods', rule, {
+  valid: [
+    'assert.strictEqual(foo, bar)',
+    'assert(foo === bar && baz)'
+  ],
+  invalid: [
+    {
+      code: 'assert(foo == bar)',
+      errors: [{ message: "'assert.equal' should be used instead of '=='" }]
+    },
+    {
+      code: 'assert(foo === bar)',
+      errors: [{
+        message: "'assert.strictEqual' should be used instead of '==='"
+      }]
+    },
+    {
+      code: 'assert(foo != bar)',
+      errors: [{
+        message: "'assert.notEqual' should be used instead of '!='"
+      }]
+    },
+    {
+      code: 'assert(foo !== bar)',
+      errors: [{
+        message: "'assert.notStrictEqual' should be used instead of '!=='"
+      }]
+    },
+  ]
+});