test by with infinite generators

Author: make-github-pseudonymous-again

test/src/base/by.js

@@ -1,12 +1,8 @@
 import test from 'ava' ;
 
-	 import {
-		 range ,
-		 by ,
-		 zip ,
-		 list } from '../../..' ;
-test( 'by' , t => {
+import { range , by , zip , list , count , head } from '../../..' ;
 
+test( 'by' , t => {
 
 	const A = by( range( 100 ) , 2 ) ;
 	const B = zip( range( 0 , 100 , 2 ) , range( 1 , 100 , 2 ) ) ;
@@ -23,3 +19,12 @@ test( 'by' , t => {
 
 } ) ;
 
+test( 'by (infinite sequences)' , t => {
+
+	const A = by( count( ) , 2 ) ;
+	const B = zip( count( 0 , 2 ) , count( 1 , 2 ) ) ;
+
+	t.deepEqual( list( head( A , 1000 ) ) , list( head( B , 1000 ) ) , 'compare to zip output' ) ;
+
+} ) ;
+