Add execution context test

kgryte · kgryte · commit c77db9adc91f · 2019-01-11T21:24:06.000-08:00
diff --git a/lib/node_modules/@stdlib/iter/map/test/test.js b/lib/node_modules/@stdlib/iter/map/test/test.js
@@ -222,6 +222,32 @@ tape( 'the function returns an iterator protocol-compliant object which invokes
 	}
 });
 
+tape( 'the function supports specifying the callback execution context', function test( t ) {
+	var ctx;
+	var it;
+	var r;
+	var i;
+
+	ctx = {
+		'count': 0
+	};
+	it = iterMap( randu(), scale, ctx );
+	t.equal( it.next.length, 0, 'has zero arity' );
+
+	for ( i = 0; i < 100; i++ ) {
+		r = it.next();
+		t.equal( typeof r.value, 'number', 'returns a number' );
+		t.equal( typeof r.done, 'boolean', 'returns a boolean' );
+	}
+	t.equal( ctx.count, 100, 'returns expected value' );
+	t.end();
+
+	function scale( v, i ) {
+		this.count += 1; // eslint-disable-line no-invalid-this
+		return v * (i+1);
+	}
+});
+
 tape( 'the returned iterator has a `return` method for closing an iterator (no argument)', function test( t ) {
 	var it;
 	var r;
