diff --git a/tests/typ/compiler/ops.typ b/tests/typ/compiler/ops.typ
index 64736228f..4d3b071f3 100644
--- a/tests/typ/compiler/ops.typ
+++ b/tests/typ/compiler/ops.typ
@@ -302,6 +302,7 @@
 // Apply positional arguments.
 #let add(x, y) = x + y
 #test(add.with(2)(3), 5)
+#test(add.with(2, 3)(), 5)
 #test(add.with(2).with(3)(), 5)
 #test((add.with(2))(4), 6)
 #test((add.with(2).with(3))(), 5)
@@ -313,3 +314,14 @@
 #let inc2 = inc.with(y: 2)
 #test(inc2(2), 4)
 #test(inc2(2, y: 4), 6)
+
+// Apply arguments to an argument sink.
+#let times(..sink) = {
+  let res = sink.pos().product()
+  if sink.named().at("negate", default: false) { res *= -1 }
+  res
+}
+#test((times.with(2, negate: true).with(5))(), -10)
+#test((times.with(2).with(5).with(negate: true))(), -10)
+#test((times.with(2).with(5, negate: true))(), -10)
+#test((times.with(2).with(negate: true))(5), -10)