test: add empty item test case

lib/middleware/parameter.js

@@ -4,7 +4,7 @@ module.exports = async (ctx, next) => {
     await next();
 
     if (ctx.state.data && (!ctx.state.data.item || ctx.state.data.item.length === 0)) {
-        throw Error('该路由目前获取内容为空，请检查源站情况或前往 https://github.com/DIYgod/RSSHub/issues 反馈该问题');
+        throw Error('this route is empty, please check the origin site or create an issue to feedback on https://github.com/DIYgod/RSSHub/issues/new/choose');
     }
 
     // decode HTML entities

lib/routes/test/index.js

@@ -5,7 +5,7 @@ module.exports = async (ctx) => {
     if (ctx.params.id === '0') {
         throw Error('Error test');
     }
-    const item = [];
+    let item = [];
     if (ctx.params.id === 'long') {
         item.push({
             title: `Long Title `.repeat(10),
@@ -34,6 +34,11 @@ module.exports = async (ctx) => {
             author: `DIYgod${i}`,
         });
     }
+
+    if (ctx.params.id === 'empty') {
+        item = null;
+    }
+
     ctx.state.data = {
         title: `Test ${ctx.params.id}`,
         link: 'https://github.com/DIYgod/RSSHub',

test/middleware/error.js

@@ -9,6 +9,7 @@ afterAll(() => {
 describe('error', () => {
     it(`error`, async () => {
         const response = await request.get('/test/0');
+        expect(response.status).toBe(404);
         expect(response.text).toMatch(/RSSHub 发生了一些意外: <pre>Error: Error test/);
     });
 });

test/middleware/parameter.js

@@ -97,3 +97,16 @@ describe('tgiv', () => {
         expect(parsed.items[1].link).toBe(`https://t.me/iv?url=https%3A%2F%2Fgithub.com%2FDIYgod%2FRSSHub%2Fissues%2F2&rhash=test`);
     });
 });
+
+describe('empty', () => {
+    it(`empty`, async () => {
+        const response1 = await request.get('/test/empty');
+        expect(response1.status).toBe(404);
+        expect(response1.text).toMatch(/RSSHub 发生了一些意外: <pre>Error: this route is empty/);
+
+        const response2 = await request.get('/test/1?limit=0');
+        expect(response2.status).toBe(200);
+        const parsed = await parser.parseString(response2.text);
+        expect(parsed.items.length).toBe(0);
+    });
+});