test: add common.skipIfEslintMissing

We've added a number of tests that hook into ESLint which can error
when running the test suite with the distributed tarball. This PR
adds a new test helper `common.skipIfEslintMissing` and will skip
remaining tests in a file when `ESLint` is not available at
`tools/node_modules/eslint`

PR-URL: #18807
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

Author: MylesBorins

test/common/README.md

@@ -351,6 +351,11 @@ Path to the project directory.
 
 Logs '1..0 # Skipped: ' + `msg` and exits with exit code `0`.
 
+### skipIfEslintMissing()
+
+Skip the rest of the tests in the current file when `ESLint` is not available
+at `tools/node_modules/eslint`
+
 ### skipIfInspectorDisabled()
 
 Skip the rest of the tests in the current file when the Inspector

test/common/index.js

@@ -551,6 +551,14 @@ exports.fileExists = function(pathname) {
   }
 };
 
+exports.skipIfEslintMissing = function() {
+  if (!exports.fileExists(
+    path.join('..', '..', 'tools', 'node_modules', 'eslint')
+  )) {
+    exports.skip('missing ESLint');
+  }
+};
+
 exports.canCreateSymLink = function() {
   // On Windows, creating symlinks requires admin privileges.
   // We'll only try to run symlink test if we have enough privileges.

test/parallel/test-eslint-alphabetize-errors.js

@@ -1,6 +1,8 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
+
+common.skipIfEslintMissing();
 
 const RuleTester = require('../../tools/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/alphabetize-errors');

test/parallel/test-eslint-buffer-constructor.js

@@ -1,6 +1,8 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
+
+common.skipIfEslintMissing();
 
 const RuleTester = require('../../tools/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/buffer-constructor');

test/parallel/test-eslint-crypto-check.js

@@ -1,6 +1,8 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
+
+common.skipIfEslintMissing();
 
 const RuleTester = require('../../tools/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/crypto-check');

test/parallel/test-eslint-inspector-check.js

@@ -1,6 +1,8 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
+
+common.skipIfEslintMissing();
 
 const RuleTester = require('../../tools/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/inspector-check');

test/parallel/test-eslint-lowercase-name-for-primitive.js

@@ -1,6 +1,8 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
+
+common.skipIfEslintMissing();
 
 const RuleTester = require('../../tools/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/lowercase-name-for-primitive');

test/parallel/test-eslint-no-let-in-for-declaration.js

@@ -1,6 +1,8 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
+
+common.skipIfEslintMissing();
 
 const RuleTester = require('../../tools/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/no-let-in-for-declaration');

test/parallel/test-eslint-no-unescaped-regexp-dot.js

@@ -1,6 +1,8 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
+
+common.skipIfEslintMissing();
 
 const RuleTester = require('../../tools/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/no-unescaped-regexp-dot');

test/parallel/test-eslint-number-isnan.js

@@ -1,6 +1,8 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
+
+common.skipIfEslintMissing();
 
 const RuleTester = require('../../tools/eslint').RuleTester;
 const rule = require('../../tools/eslint-rules/number-isnan');