test: improve test stream transform constructor

* new test for the error when a transform function is not specified * use let instead of var * use assert.strictEqual instead of assert.equal * use arrow functions PR-URL: nodejs#10699 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Colin Ihrig <[email protected]>
italoacasas · Jan 30, 2017 · ba625a4 · ba625a4
1 parent 7cbb9e5
commit ba625a4
Showing 1 changed file with 10 additions and 3 deletions.
diff --git a/test/parallel/test-stream-transform-constructor-set-methods.js b/test/parallel/test-stream-transform-constructor-set-methods.js
@@ -21,12 +21,19 @@ const t = new Transform({
   flush: _flush
 });
 
+const t2 = new Transform({});
+
 t.end(Buffer.from('blerg'));
 t.resume();
 
-process.on('exit', function() {
+assert.throws(() => {
+  t2.end(Buffer.from('blerg'));
+}, /^Error: _transform\(\) is not implemented$/);
+
+
+process.on('exit', () => {
   assert.strictEqual(t._transform, _transform);
   assert.strictEqual(t._flush, _flush);
-  assert(_transformCalled);
-  assert(_flushCalled);
+  assert.strictEqual(_transformCalled, true);
+  assert.strictEqual(_flushCalled, true);
 });