1 files changed, 27 insertions, 0 deletions
diff --git a/packages/web/src/math/Ratio.test.ts b/packages/web/src/math/Ratio.test.ts
new file mode 100644
index 0000000..da6fef2
--- /dev/null
+++ b/packages/web/src/math/Ratio.test.ts
@@ -0,0 +1,27 @@
+import { describe, expect, test } from "vitest";
+import Ratio from "./Ratio";
+
+describe(Ratio, () => {
+  describe(Ratio.prototype.add, () => {
+    test("returns fractions in simplest form", () => {
+      const a = Ratio.fromInteger(0);
+      const b = new Ratio(1, 4);
+
+      const c = a.add(b);
+      expect(c.numerator).toBe(1);
+      expect(c.denominator).toBe(4);
+
+      const d = c.add(b);
+      expect(d.numerator).toBe(1);
+      expect(d.denominator).toBe(2);
+
+      const e = d.add(b);
+      expect(e.numerator).toBe(3);
+      expect(e.denominator).toBe(4);
+
+      const f = e.add(b);
+      expect(f.numerator).toBe(1);
+      expect(f.denominator).toBe(1);
+    });
+  });
+});