diff --git a/src/__tests__/index.spec.ts b/src/__tests__/index.spec.ts
index 7654a68..1eaad11 100644
--- a/src/__tests__/index.spec.ts
+++ b/src/__tests__/index.spec.ts
@@ -5,6 +5,7 @@ import {
   approximatePrimeLimitWithErrors,
   arraysEqual,
   binomial,
+  clamp,
   div,
   dot,
   extendedEuclid,
@@ -209,3 +210,17 @@ describe('Dot product', () => {
     expect(dot(b, a)).toBe(38);
   });
 });
+
+describe('Value clamper', () => {
+  it('works for lower bounds', () => {
+    const value = -123.4;
+    const clamped = clamp(0, 128, value);
+    expect(clamped).toBe(0);
+  });
+
+  it('works for upper bounds', () => {
+    const value = 13881.818;
+    const clamped = clamp(0, 12800, value);
+    expect(clamped).toBe(12800);
+  });
+});