✅ #38 extractCatNameById のテスト追加とディレクトリの整理

src/features/__tests__/cat/extractCatNameById.spec.ts

@@ -0,0 +1,28 @@
+import { extractCatNameById, type CatId } from '@/features';
+import { ExhaustiveError } from '@/utils';
+import type { CatName } from '../../cat';
+
+describe('src/features/cat.ts extractCatNameById TestCases', () => {
+  type TestTable = {
+    catId: CatId;
+    expected: CatName;
+  };
+
+  it.each`
+    catId     | expected
+    ${'moko'} | ${'もこ'}
+  `(
+    'should return catName. catId: $catId',
+    ({ catId, expected }: TestTable) => {
+      expect(extractCatNameById(catId)).toStrictEqual(expected);
+    }
+  );
+
+  it.each`
+    catId
+    ${'cat'}
+    ${'unknown'}
+  `('should ExhaustiveError Throw. catId: $catId', ({ catId }: TestTable) => {
+    expect(() => extractCatNameById(catId)).toThrow(ExhaustiveError);
+  });
+});

src/features/__tests__/cats/isCatId.spec.ts → src/features/__tests__/cat/isCatId.spec.ts

@@ -1,4 +1,3 @@
-/* eslint-disable no-magic-numbers */
 import { isCatId, type CatId } from '@/features';
 
 describe('src/features/cat.ts isCatId TestCases', () => {

src/features/cat.ts

@@ -6,7 +6,7 @@ export type CatId = (typeof catIds)[number];
 
 const catNames = ['もこ'] as const;
 
-type CatName = (typeof catNames)[number];
+export type CatName = (typeof catNames)[number];
 
 export type FetchCatMessageDto = {
   catId: CatId;