diff --git a/packages/studio/src/utils/rounding.test.ts b/packages/studio/src/utils/rounding.test.ts
new file mode 100644
index 000000000..1cce91db7
--- /dev/null
+++ b/packages/studio/src/utils/rounding.test.ts
@@ -0,0 +1,30 @@
+import { describe, expect, it } from "vitest";
+import { roundTo3, roundToCenti } from "./rounding";
+
+describe("roundTo3", () => {
+  it("rounds to 3 decimal places", () => {
+    expect(roundTo3(1.23456)).toBe(1.235);
+  });
+
+  it("leaves values already at 3 decimal places unchanged", () => {
+    expect(roundTo3(1.5)).toBe(1.5);
+  });
+
+  it("handles negative values", () => {
+    expect(roundTo3(-1.23456)).toBe(-1.235);
+  });
+});
+
+describe("roundToCenti", () => {
+  it("rounds to 2 decimal places", () => {
+    expect(roundToCenti(1.2345)).toBe(1.23);
+  });
+
+  it("leaves values already at 2 decimal places unchanged", () => {
+    expect(roundToCenti(1.5)).toBe(1.5);
+  });
+
+  it("handles negative values", () => {
+    expect(roundToCenti(-1.2345)).toBe(-1.23);
+  });
+});