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: https://github.com/nodejs/node/pull/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>

1 files changed, 8 insertions, 0 deletions

diff --git a/test/common/index.js b/test/common/index.js
index 4c2c548830..a38b985208 100644
--- a/test/common/index.js
+++ b/test/common/index.js
@@ -494,6 +494,14 @@ 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.