問題を追加

.github/workflows/ci.yml

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+name: ci
+on:
+  push:
+
+jobs:
+  test:
+    name: Build and Test
+    timeout-minutes: 15
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 2
+      - name: Setup Node.js environment
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+      - run: corepack enable yarn
+      - id: yarn
+        run: echo "cache-dir=$(yarn cache dir)" >> $GITHUB_OUTPUT
+      - uses: actions/cache@v3
+        name: Setup pnpm cache
+        with:
+          path: ${{ steps.yarn.outputs.cache-dir }}
+          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-
+      - name: Install dependencies
+        run: yarn
+      - name: Test
+        run: yarn test

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+.cache
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/
+.pnp.*
+
+# other
+output.png

.vscode/extensions.json

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+{
+  "recommendations": ["ZixuanChen.vitest-explorer"]
+}

.yarnrc.yml

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+nodeLinker: node-modules

__test__/index.test.ts

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+import { describe, test, expect, vi } from "vitest";
+import { readFile, rm, cp } from "fs/promises";
+
+import { main as main1 } from "../script_1";
+import { main as main2 } from "../script_2";
+
+describe("外部パッケージの問題1(csv-parse)", () => {
+  test("問題1の結果が正しい", async () => {
+    const spy = vi
+      .spyOn(global.console, "log")
+      .mockImplementation((args) => args);
+    await main1();
+    expect(spy).toHaveLastReturnedWith("国語の平均点: 77.5点");
+  });
+  test("成績表の点数を変えても結果が正しい", async () => {
+    await cp("./__test__/seiseki_other.csv", "./seiseki.csv", { force: true });
+    const spy = vi
+      .spyOn(global.console, "log")
+      .mockImplementation((args) => args);
+    await main1();
+    expect(spy).toHaveLastReturnedWith("国語の平均点: 80.7点");
+    await cp("./__test__/seiseki.csv", "./seiseki.csv", { force: true });
+  });
+});
+
+describe("外部パッケージの問題2(sharp)", () => {
+  test("問題2の結果が正しい", async () => {
+    await rm("./output.png").catch(() => {});
+    await main2();
+    const answer = await readFile("./__test__/answer.png", "base64");
+    const result = await readFile("./output.png", "base64");
+    expect(answer).toEqual(result);
+    await rm("./output.png");
+  });
+});

__test__/seiseki.csv

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+氏名,国語,数学,英語
+田中太郎,85,78,92
+山田花子,70,65,80
+佐藤次郎,95,88,90
+鈴木三郎,60,70,75

__test__/seiseki_other.csv

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+氏名,国語,数学,英語
+岡田健太,80,85,88
+伊藤美香,75,72,90
+加藤健太郎,90,92,85
+中村さち子,78,80,82

package.json

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+{
+  "name": "ueq-study-nodejs-external-package-answer",
+  "version": "1.0.0",
+  "devDependencies": {
+    "@vitest/coverage-v8": "^0.34.1",
+    "vitest": "^0.34.1"
+  },
+  "type": "module",
+  "scripts": {
+    "test": "vitest"
+  },
+  "volta": {
+    "node": "18.17.1",
+    "yarn": "4.0.2"
+  }
+}

script_1.js

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+export const main = async () => {
+  const csvPath = "./seiseki.csv";
+  const result = 0;
+  console.log(`国語の平均点: ${result}点`);
+};
+
+main();

script_2.js

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+export const main = async () => {
+  const imgPath = "./logo.png";
+  const outputPath = "./output.png";
+  // 加工したPNGファイルを保存
+};
+
+main();

seiseki.csv

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+氏名,国語,数学,英語
+岡田健太,80,85,88
+伊藤美香,75,72,90
+加藤健太郎,90,92,85
+中村さち子,78,80,82

vitest.config.ts

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+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: { dir: "__test__" },
+});