test: replace indexOf with includes

Start the transition to Array.prototype.includes() and
String.prototype.includes().  This commit refactors most of the
comparisons of Array.prototype.indexOf() and String.prototype.indexOf()
return values with -1 to the former methods in tests.

PR-URL: https://github.com/nodejs/node/pull/12604
Refs: https://github.com/nodejs/node/issues/12586
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/test/parallel/test-net-eaddrinuse.js b/test/parallel/test-net-eaddrinuse.js
index a89168936d..8c3bcc6cf1 100644
--- a/test/parallel/test-net-eaddrinuse.js
+++ b/test/parallel/test-net-eaddrinuse.js
@@ -30,7 +30,7 @@ const server2 = net.createServer(function(socket) {
 });
 server1.listen(0, function() {
   server2.on('error', function(error) {
-    assert.strictEqual(true, error.message.indexOf('EADDRINUSE') >= 0);
+    assert.strictEqual(true, error.message.includes('EADDRINUSE'));
     server1.close();
   });
   server2.listen(this.address().port);