test: improve test-buffer-includes.js

* verify error message * use arrow funcs PR-URL: nodejs#11203 Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Yuta Hiroto <[email protected]> Reviewed-By: Rich Trott <[email protected]> Reviewed-By: James M Snell <[email protected]>
krydos · Feb 25, 2017 · acbf498 · acbf498
1 parent e58ef29
commit acbf498
Showing 1 changed file with 9 additions and 7 deletions.
diff --git a/test/parallel/test-buffer-includes.js b/test/parallel/test-buffer-includes.js
@@ -275,15 +275,17 @@ for (let lengthIndex = 0; lengthIndex < lengths.length; lengthIndex++) {
   }
 }
 
-assert.throws(function() {
-  b.includes(function() { });
-});
-assert.throws(function() {
+const expectedError =
+  /^TypeError: "val" argument must be string, number, Buffer or Uint8Array$/;
+assert.throws(() => {
+  b.includes(() => {});
+}, expectedError);
+assert.throws(() => {
   b.includes({});
-});
-assert.throws(function() {
+}, expectedError);
+assert.throws(() => {
   b.includes([]);
-});
+}, expectedError);
 
 // test truncation of Number arguments to uint8
 {