diff --git a/test/pattern.test.mjs b/test/pattern.test.mjs
index 70e49974..3d6a58dd 100644
--- a/test/pattern.test.mjs
+++ b/test/pattern.test.mjs
@@ -80,6 +80,16 @@ describe('Pattern', function() {
       assert.equal(pure(3).sub(pure(4)).query(new TimeSpan(Fraction(0), Fraction(1)))[0].value, -1)
     })
   })
+  describe('mul()', function () {
+    it('Can multiply things', function() {
+      assert.equal(pure(3).mul(pure(2)).firstCycle[0].value, 6)
+    })
+  })
+  describe('div()', function () {
+    it('Can divide things', function() {
+      assert.equal(pure(3).div(pure(2)).firstCycle[0].value, 1.5)
+    })
+  })
   describe('union()', function () {
     it('Can union things', function () {
       assert.deepStrictEqual(pure({a: 4, b: 6}).union(pure({c: 7})).firstCycle[0].value, {a: 4, b: 6, c: 7})