localStorge.saveの実装

jest.config.js

@@ -11,5 +11,7 @@ module.exports = {
   testMatch: ['**/src/**/*.test.(ts|tsx|js)'],
   testPathIgnorePatterns: ['/node_modules/'],
   preset: 'ts-jest',
-  // setupFiles: ['jest-localstorage-mock', 'jest-date-mock']
+  setupFiles: ['jest-localstorage-mock']
 }
+
+//, 'jest-date-mock'

package.json

@@ -34,6 +34,7 @@
     ]
   },
   "devDependencies": {
+    "jest-localstorage-mock": "^2.4.0",
     "ts-jest": "^24.0.2"
   }
 }

src/adapters/local-storage.test.ts

@@ -0,0 +1,9 @@
+import { createTipsLocalStorage } from "./local-storage";
+
+describe("save", () => {
+  test("ローカルストレージにtips-<ID>でメッセージが格納される", () => {
+    const tipsLocalStorage = createTipsLocalStorage();
+    tipsLocalStorage.save("ID", "hoge");
+    expect(localStorage.getItem("tips-ID")).toBe("hoge");
+  });
+});

src/adapters/local-storage.ts

@@ -0,0 +1,10 @@
+import { TipsPort } from "../domains/tips";
+
+export const createTipsLocalStorage = (): TipsPort => {
+  const save: TipsPort["save"] = async (id, message) => {
+    localStorage.setItem(`tips-${id}`, message);
+  };
+  const findById = async () => ({id: 'dummy', message: 'dummy'});
+  const findAll = async () => [];
+  return { save, findAll, findById };
+};

yarn.lock

@@ -5312,6 +5312,11 @@ jest-leak-detector@^24.7.0:
   dependencies:
     pretty-format "^24.7.0"
 
+jest-localstorage-mock@^2.4.0:
+  version "2.4.0"
+  resolved "https://registry.yarnpkg.com/jest-localstorage-mock/-/jest-localstorage-mock-2.4.0.tgz#c6073810735dd3af74020ea6c3885ec1cc6d0d13"
+  integrity sha512-/mC1JxnMeuIlAaQBsDMilskC/x/BicsQ/BXQxEOw+5b1aGZkkOAqAF3nu8yq449CpzGtp5jJ5wCmDNxLgA2m6A==
+
 jest-matcher-utils@^24.7.0:
   version "24.7.0"
   resolved "https://registry.yarnpkg.com/jest-matcher-utils/-/jest-matcher-utils-24.7.0.tgz#bbee1ff37bc8b2e4afcaabc91617c1526af4bcd4"