Added new feed navigation link test cases

Author: KartoffelChipss

src/tests/v1_2/feed.test.ts

@@ -50,7 +50,7 @@ describe('Feed', () => {
         const feed = new Feed('feed5', 'XML Feed')
             .setAuthor('Feed Author')
             .addSelfLink('/feed', 'navigation')
-            .addStartLink('/');
+            .addNavigationLink('start', '/');
 
         const entry = new Entry('entry1', 'Entry 1')
             .setAuthor('Entry Author')
@@ -100,4 +100,124 @@ describe('Feed', () => {
         const xml = feed.toXml({ baseUrl });
         expect(xml).toContain('pse:count="10"');
     });
+
+    describe('Navigation Links', () => {
+        it('should add a single navigation link', () => {
+            const feed = new Feed('nav1', 'Navigation Test');
+            feed.addNavigationLink('start', '/root');
+            
+            const startLink = feed.getNavigationLink('start');
+            expect(startLink).toBeDefined();
+            expect(startLink?.rel).toBe('start');
+            expect(startLink?.href).toBe('/root');
+            expect(startLink?.type).toBe('application/atom+xml;profile=opds-catalog;kind=navigation');
+        });
+
+        it('should replace existing navigation link with same rel', () => {
+            const feed = new Feed('nav2', 'Replace Test');
+            feed.addNavigationLink('next', '/page2');
+            feed.addNavigationLink('next', '/page3');
+            
+            const nextLinks = feed.getLinks().filter(link => link.rel === 'next');
+            expect(nextLinks).toHaveLength(1);
+            expect(nextLinks[0].href).toBe('/page3');
+        });
+
+        it('should add multiple navigation links at once', () => {
+            const feed = new Feed('nav3', 'Multiple Links Test');
+            feed.addNavigationLinks({
+                start: '/root',
+                previous: '/page1',
+                next: '/page3',
+                first: '/page1',
+                last: '/page10'
+            });
+            
+            expect(feed.getNavigationLink('start')?.href).toBe('/root');
+            expect(feed.getNavigationLink('previous')?.href).toBe('/page1');
+            expect(feed.getNavigationLink('next')?.href).toBe('/page3');
+            expect(feed.getNavigationLink('first')?.href).toBe('/page1');
+            expect(feed.getNavigationLink('last')?.href).toBe('/page10');
+        });
+
+        it('should skip undefined values in addNavigationLinks', () => {
+            const feed = new Feed('nav4', 'Skip Undefined Test');
+            feed.addNavigationLinks({
+                start: '/root',
+                previous: undefined,
+                next: '/page3'
+            });
+            
+            expect(feed.getNavigationLink('start')).toBeDefined();
+            expect(feed.getNavigationLink('previous')).toBeUndefined();
+            expect(feed.getNavigationLink('next')).toBeDefined();
+        });
+
+        it('should return undefined for non-existent navigation links', () => {
+            const feed = new Feed('nav5', 'Non-existent Test');
+            expect(feed.getNavigationLink('next')).toBeUndefined();
+        });
+
+        it('should chain navigation link methods', () => {
+            const feed = new Feed('nav6', 'Chaining Test')
+                .addNavigationLink('start', '/root')
+                .addNavigationLinks({
+                    previous: '/page1',
+                    next: '/page3'
+                });
+            
+            expect(feed.getNavigationLink('start')).toBeDefined();
+            expect(feed.getNavigationLink('previous')).toBeDefined();
+            expect(feed.getNavigationLink('next')).toBeDefined();
+        });
+
+        it('should generate correct XML for navigation links', () => {
+            const feed = new Feed('nav7', 'XML Navigation Test');
+            feed.addNavigationLinks({
+                start: '/root',
+                next: '/page2',
+                previous: '/page1'
+            });
+            
+            const xml = feed.toXml({ baseUrl });
+            expect(xml).toContain('rel="start"');
+            expect(xml).toContain('rel="next"');
+            expect(xml).toContain('rel="previous"');
+            expect(xml).toContain(`href="${baseUrl}/root"`);
+            expect(xml).toContain(`href="${baseUrl}/page2"`);
+            expect(xml).toContain(`href="${baseUrl}/page1"`);
+            expect(xml).toContain('type="application/atom+xml;profile=opds-catalog;kind=navigation"');
+        });
+
+        it('should handle replacement in addNavigationLinks', () => {
+            const feed = new Feed('nav8', 'Replacement Test');
+            feed.addNavigationLink('next', '/page2');
+            feed.addNavigationLinks({
+                next: '/page3',
+                last: '/page10'
+            });
+            
+            const nextLinks = feed.getLinks().filter(link => link.rel === 'next');
+            expect(nextLinks).toHaveLength(1);
+            expect(nextLinks[0].href).toBe('/page3');
+            expect(feed.getNavigationLink('last')?.href).toBe('/page10');
+        });
+    });
+
+    describe('Self Links', () => {
+        it('should get self link', () => {
+            const feed = new Feed('self1', 'Self Link Test');
+            feed.addSelfLink('/feed', 'navigation');
+            
+            const selfLink = feed.getSelfLink();
+            expect(selfLink).toBeDefined();
+            expect(selfLink?.rel).toBe('self');
+            expect(selfLink?.href).toBe('/feed');
+        });
+
+        it('should return undefined when no self link exists', () => {
+            const feed = new Feed('self2', 'No Self Link Test');
+            expect(feed.getSelfLink()).toBeUndefined();
+        });
+    });
 });