msw: Implement GET /api/v1/keywords/:keyword_id request handler

Author: Turbo87

packages/crates-io-msw/handlers/keywords.js

@@ -1,3 +1,4 @@
+import getKeyword from './keywords/get.js';
 import listKeywords from './keywords/list.js';
 
-export default [listKeywords];
+export default [listKeywords, getKeyword];

packages/crates-io-msw/handlers/keywords/get.js

@@ -0,0 +1,15 @@
+import { http, HttpResponse } from 'msw';
+
+import { db } from '../../index.js';
+import { serializeKeyword } from '../../serializers/keyword.js';
+import { notFound } from '../../utils/handlers.js';
+
+export default http.get('/api/v1/keywords/:keyword_id', ({ params }) => {
+  let keywordId = params.keyword_id;
+  let keyword = db.keyword.findFirst({ where: { id: { equals: keywordId } } });
+  if (!keyword) {
+    return notFound();
+  }
+
+  return HttpResponse.json({ keyword: serializeKeyword(keyword) });
+});

packages/crates-io-msw/handlers/keywords/get.test.js

@@ -0,0 +1,40 @@
+import { assert, test } from 'vitest';
+
+import { db } from '../../index.js';
+
+test('returns 404 for unknown keywords', async function () {
+  let response = await fetch('/api/v1/keywords/foo');
+  assert.strictEqual(response.status, 404);
+  assert.deepEqual(await response.json(), { errors: [{ detail: 'Not Found' }] });
+});
+
+test('returns a keyword object for known keywords', async function () {
+  db.keyword.create({ keyword: 'cli' });
+
+  let response = await fetch('/api/v1/keywords/cli');
+  assert.strictEqual(response.status, 200);
+  assert.deepEqual(await response.json(), {
+    keyword: {
+      id: 'cli',
+      crates_cnt: 0,
+      keyword: 'cli',
+    },
+  });
+});
+
+test('calculates `crates_cnt` correctly', async function () {
+  let cli = db.keyword.create({ keyword: 'cli' });
+  Array.from({ length: 7 }, () => db.crate.create({ keywords: [cli] }));
+  let notCli = db.keyword.create({ keyword: 'not-cli' });
+  Array.from({ length: 3 }, () => db.crate.create({ keywords: [notCli] }));
+
+  let response = await fetch('/api/v1/keywords/cli');
+  assert.strictEqual(response.status, 200);
+  assert.deepEqual(await response.json(), {
+    keyword: {
+      id: 'cli',
+      crates_cnt: 7,
+      keyword: 'cli',
+    },
+  });
+});