test(services): add tests for posts fetchers

1 files changed, 26 insertions, 0 deletions

diff --git a/src/services/graphql/fetchers/posts/fetch-all-posts-slugs.test.ts b/src/services/graphql/fetchers/posts/fetch-all-posts-slugs.test.ts
new file mode 100644
index 0000000..a90df02
--- /dev/null
+++ b/src/services/graphql/fetchers/posts/fetch-all-posts-slugs.test.ts
@@ -0,0 +1,26 @@
+import { afterEach, describe, expect, it } from '@jest/globals';
+import { wpPostsFixture } from '../../../../../tests/fixtures';
+import { fetchAllPostsSlugs } from './fetch-all-posts-slugs';
+
+describe('fetch-all-posts-slugs', () => {
+  afterEach(() => {
+    window.history.replaceState({}, '', '/');
+  });
+
+  it('returns the WordPress posts using GraphQL', async () => {
+    const result = await fetchAllPostsSlugs(wpPostsFixture.length);
+
+    expect.assertions(1);
+
+    expect(result).toStrictEqual(wpPostsFixture.map((post) => post.slug));
+  });
+
+  it('rejects with an error when no posts are found', async () => {
+    window.history.replaceState({}, '', '/?error=true');
+    expect.assertions(1);
+
+    await expect(async () =>
+      fetchAllPostsSlugs(wpPostsFixture.length)
+    ).rejects.toEqual(new Error('Unable to find the posts slugs.'));
+  });
+});