1 files changed, 21 insertions, 0 deletions
diff --git a/frontend/__tests__/formatMoney.test.js b/frontend/__tests__/formatMoney.test.js
new file mode 100644
index 0000000..c5c79b6
--- /dev/null
+++ b/frontend/__tests__/formatMoney.test.js
@@ -0,0 +1,21 @@
+import formatMoney from '../lib/formatMoney';
+
+describe('formatMoney', () => {
+  it('works with fractional dollars', () => {
+    expect(formatMoney(1)).toEqual('$0.01');
+    expect(formatMoney(10)).toEqual('$0.10');
+  });
+
+  it('leaves cents off for whole dollars', () => {
+    expect(formatMoney(5000)).toEqual('$50');
+    expect(formatMoney(100)).toEqual('$1');
+    expect(formatMoney(50000000)).toEqual('$500,000');
+  });
+
+  it('works with whole and fractional dollars', () => {
+    expect(formatMoney(5012)).toEqual('$50.12');
+    expect(formatMoney(101)).toEqual('$1.01');
+    expect(formatMoney(110)).toEqual('$1.10');
+    expect(formatMoney(54345345)).toEqual('$543,453.45');
+  });
+});