✨ 【第3章三角測量】null との等値性比較のテストを追加

dodonki1223 · Dec 7, 2021 · c5788d5 · c5788d5
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diff --git a/TODO.md b/TODO.md
@@ -3,4 +3,5 @@
 - [ ] amount を private にする
 - [x] Dollar の副作用どうする？
 - [ ] Money の丸め処理どうする？
+- [ ] nullとの等価性比較
 - [x] equals()メソッドの実装
diff --git a/src/__tests__/dollar.test.ts b/src/__tests__/dollar.test.ts
@@ -11,3 +11,10 @@ test('equals', () => {
   expect(new Dollar(5).equals(new Dollar(5))).toBeTruthy();
   expect(new Dollar(5).equals(new Dollar(6))).toBeFalsy();
 });
+
+test('null equals', () => {
+  const five = new Dollar(5);
+  const ten = five.times(2);
+
+  expect(ten.equals(null)).toBeFalsy();
+});