test: add fetchQutoes test

js/quote.test.js

@@ -1,4 +1,4 @@
-import { getRandomQuote } from './quote';
+import { getRandomQuote, fetchQuotes } from './quote';
 
 describe('getRandomQuote', () => {
     test('returns a random quote from an array of quotes', () => {
@@ -10,4 +10,51 @@ describe('getRandomQuote', () => {
         const randomQuote = getRandomQuote(sampleQuotes);
         expect(sampleQuotes).toContain(randomQuote);
     });
+});
+
+
+describe('fetchQuotes', () => {
+    it('should return an array of quotes', async () => {
+        const quotes = await fetchQuotes();
+        expect(Array.isArray(quotes)).toBe(true);
+    });
+
+    it('should throw an error if the server returns an error status', async () => {
+        // Mock a failed fetch response
+        global.fetch = jest.fn(() =>
+            Promise.resolve({
+                ok: false,
+                status: 404,
+                statusText: 'Not Found',
+            }),
+        );
+
+        try {
+            await fetchQuotes();
+        } catch (error) {
+            expect(error.message).toBe('Server returned 404 Not Found');
+        }
+
+        // Restore the original fetch function
+        global.fetch.mockRestore();
+    });
+
+    it('should throw an error if the data structure is invalid', async () => {
+        // Mock an invalid fetch response
+        global.fetch = jest.fn(() =>
+            Promise.resolve({
+                ok: true,
+                json: () => Promise.resolve({}),
+            }),
+        );
+
+        try {
+            await fetchQuotes();
+        } catch (error) {
+            expect(error.message).toBe('Invalid data structure: missing quotes array');
+        }
+
+        // Restore the original fetch function
+        global.fetch.mockRestore();
+    });
 });