Setup Jest (#57)

- Setup Jest
- Add test scripts
- Configure Drone

Fixes #1

Co-authored-by: Ethan Lane <ethan@vylpes.com>
Reviewed-on: https://gitea.vylpes.xyz/RabbitLabs/random-bunny/pulls/57

.drone.yml

@@ -6,12 +6,19 @@ steps:
     image: node
     commands:
       - yarn install --frozen-lockfile
+      - yarn build
   - name: test
     image: node
     commands:
       - yarn test
     depends_on:
       - build
+  - name: lint
+    image: node
+    commands:
+      - yarn lint
+    depends_on:
+      - build
 
 trigger:
   branch:

.eslintignore

@@ -0,0 +1 @@
+dist/

.eslintrc

@@ -44,6 +44,7 @@
         "module": "writable",
         "require": "writable",
         "process": "writable",
-        "console": "writable"
+        "console": "writable",
+        "jest": "writable"
     }
 }

.npmignore

@@ -1 +1,5 @@
-app.ts
+app.ts
+
+tests/
+jest.config.cjs
+jest.setup.js

jest.config.cjs

@@ -0,0 +1,4 @@
+module.exports = {
+    preset: "ts-jest",
+    setupFiles: [ "./jest.setup.js" ]
+}

jest.setup.js

@@ -0,0 +1,3 @@
+jest.setTimeout(1 * 1000); // 1 second
+jest.resetModules();
+jest.resetAllMocks();

package.json

@@ -17,13 +17,13 @@
   ],
   "dependencies": {
     "glob-parent": "^6.0.0",
-    "got": "^12.0.0",
+    "got-cjs": "^12.5.4",
     "linqts": "^1.14.4"
   },
   "scripts": {
     "build": "tsc",
     "start": "ts-node app.ts",
-    "test": "echo none",
+    "test": "jest",
     "lint": "eslint ."
   },
   "bugs": {
@@ -33,16 +33,20 @@
   "homepage": "https://gitea.vylpes.xyz/RabbitLabs/random-bunny",
   "funding": "https://ko-fi.com/vylpes",
   "devDependencies": {
+    "@types/eslint": "^8.21.1",
+    "@types/jest": "^29.4.0",
     "@types/node": "^18.0.0",
-    "eslint": "^8.0.0",
+    "@typescript-eslint/eslint-plugin": "^5.54.0",
+    "@typescript-eslint/parser": "^5.54.0",
+    "eslint": "^8.35.0",
+    "jest": "^29.4.3",
+    "jest-mock-extended": "^3.0.3",
+    "ts-jest": "^29.0.5",
+    "ts-mockito": "^2.6.1",
     "ts-node": "^10.9.1",
     "typescript": "^5.0.0"
   },
   "files": [
     "dist"
-  ],
-  "type": "module",
-  "engines": {
-    "node": ">=14.16"
-  }
+  ]
 }

src/index.ts

@@ -1,6 +1,6 @@
 import IReturnResult from "./contracts/IReturnResult.js";
 import IRedditResult from "./contracts/IRedditResult.js";
-import fetch from "got";
+import fetch from "got-cjs";
 import { List } from 'linqts';
 import IFetchResult from "./contracts/IFetchResult.js";
 
@@ -35,15 +35,17 @@ export default async function randomBunny(subreddit: string, sortBy?: string): P
         .Where(x => x!.data.url.includes('.jpg') || x!.data.url.includes('.png'))
         .ToArray();
 
-    const random = Math.floor((Math.random() * dataWithImages.length - 1) + 0); // Between 0 and (size - 1)
+    let random = 0;
 
-    const randomSelect = dataWithImages[random];
-
-    if (!randomSelect) {
+    if (dataWithImages.length == 0) {
         return {
             IsSuccess: false,
         };
-    };
+    } else if (dataWithImages.length > 1) {
+        random = Math.floor((Math.random() * dataWithImages.length - 1) + 0); // Between 0 and (size - 1)
+    }
+
+    const randomSelect = dataWithImages[random];
 
     const randomData = randomSelect.data;
 

tests/index.test.ts

@@ -0,0 +1,172 @@
+import randomBunny from "../src/index";
+import fetch from "got-cjs";
+
+jest.mock('got-cjs');
+const fetchMock = jest.mocked(fetch);
+
+describe('randomBunny', () => {
+    test('GIVEN subreddit AND sortBy is supplied, EXPECT successful result', async() => {
+        fetchMock.mockResolvedValue({
+            body: JSON.stringify({
+                data: {
+                    children: [
+                        {
+                            data: {
+                                archived: false,
+                                downs: 0,
+                                hidden: false,
+                                permalink: '/r/Rabbits/comments/12pa5te/someone_told_pickles_its_monday_internal_fury/',
+                                subreddit: 'Rabbits',
+                                subreddit_subscribers: 298713,
+                                title: 'Someone told pickles it’s Monday… *internal fury*',
+                                ups: 1208,
+                                url: 'https://i.redd.it/cr8xudsnkgua1.jpg',
+                            },
+                        },
+                    ],
+                }
+            }),
+        });
+
+        const result = await randomBunny('rabbits', 'new');
+
+        expect(result.IsSuccess).toBeTruthy();
+        expect(result.Result).toBeDefined();
+
+        expect(fetchMock).toBeCalledWith('https://reddit.com/r/rabbits/new.json');
+    });
+
+    test('GIVEN sortBy is NOT supplied, expect it to default to hot', async () => {
+        fetchMock.mockResolvedValue({
+            body: JSON.stringify({
+                data: {
+                    children: [
+                        {
+                            data: {
+                                archived: false,
+                                downs: 0,
+                                hidden: false,
+                                permalink: '/r/Rabbits/comments/12pa5te/someone_told_pickles_its_monday_internal_fury/',
+                                subreddit: 'Rabbits',
+                                subreddit_subscribers: 298713,
+                                title: 'Someone told pickles it’s Monday… *internal fury*',
+                                ups: 1208,
+                                url: 'https://i.redd.it/cr8xudsnkgua1.jpg',
+                            },
+                        },
+                    ],
+                }
+            }),
+        });
+
+        const result = await randomBunny('rabbits');
+
+        expect(result.IsSuccess).toBeTruthy();
+        expect(result.Result).toBeDefined();
+
+        expect(fetchMock).toBeCalledWith('https://reddit.com/r/rabbits/hot.json');
+    });
+
+    test('GIVEN sortBy is NOT valid, expect it to default to hot', async () => {
+        fetchMock.mockResolvedValue({
+            body: JSON.stringify({
+                data: {
+                    children: [
+                        {
+                            data: {
+                                archived: false,
+                                downs: 0,
+                                hidden: false,
+                                permalink: '/r/Rabbits/comments/12pa5te/someone_told_pickles_its_monday_internal_fury/',
+                                subreddit: 'Rabbits',
+                                subreddit_subscribers: 298713,
+                                title: 'Someone told pickles it’s Monday… *internal fury*',
+                                ups: 1208,
+                                url: 'https://i.redd.it/cr8xudsnkgua1.jpg',
+                            },
+                        },
+                    ],
+                }
+            }),
+        });
+
+        const result = await randomBunny('rabbits', 'invalid');
+
+        expect(result.IsSuccess).toBeTruthy();
+        expect(result.Result).toBeDefined();
+
+        expect(fetchMock).toBeCalledWith('https://reddit.com/r/rabbits/hot.json');
+    });
+
+    test('GIVEN the fetch fails, EXPECT failure result', async () => {
+        fetchMock.mockResolvedValue(null);
+
+        const result = await randomBunny('rabbits', 'new');
+
+        expect(result.IsSuccess).toBeFalsy();
+        expect(result.Result).toBeUndefined();
+
+        expect(fetchMock).toBeCalledWith('https://reddit.com/r/rabbits/new.json');
+    });
+
+    test('GIVEN the result is NOT valid JSON, EXPECT failure result', async () => {
+        fetchMock.mockResolvedValue({
+            body: JSON.stringify(null),
+        });
+
+        const result = await randomBunny('rabbits', 'new');
+
+        expect(result.IsSuccess).toBeFalsy();
+        expect(result.Result).toBeUndefined();
+
+        expect(fetchMock).toBeCalledWith('https://reddit.com/r/rabbits/new.json');
+    });
+
+    test('GIVEN randomSelect does NOT find a response, EXPECT failure result', async () => {
+        fetchMock.mockResolvedValue({
+            body: JSON.stringify({
+                data: {
+                    children: [],
+                }
+            }),
+        });
+
+        const result = await randomBunny('rabbits', 'new');
+
+        expect(result.IsSuccess).toBeFalsy();
+        expect(result.Result).toBeUndefined();
+
+        expect(fetchMock).toBeCalledWith('https://reddit.com/r/rabbits/new.json');
+    });
+
+    test('GIVEN randomSelect does NOT find a valid response, EXPECT failure result', async () => {
+        fetchMock.mockResolvedValue({
+            body: JSON.stringify({
+                data: {
+                    children: [
+                        {
+                            data: {
+                                archived: false,
+                                downs: 0,
+                                hidden: false,
+                                permalink: '/r/Rabbits/comments/12pa5te/someone_told_pickles_its_monday_internal_fury/',
+                                subreddit: 'Rabbits',
+                                subreddit_subscribers: 298713,
+                                title: 'Someone told pickles it’s Monday… *internal fury*',
+                                ups: 1208,
+                                url: 'https://i.redd.it/cr8xudsnkgua1.webp',
+                            },
+                        },
+                    ],
+                }
+            }),
+        });
+
+        const result = await randomBunny('rabbits', 'new');
+
+        expect(result.IsSuccess).toBeFalsy();
+        expect(result.Result).toBeUndefined();
+
+        expect(fetchMock).toBeCalledWith('https://reddit.com/r/rabbits/new.json');
+    });
+});

tsconfig.json

@@ -73,7 +73,9 @@
       "./src",
     ],
     "exclude": [
-      "./tests"
+      "./tests",
+      "jest.config.cjs",
+      "jest.setup.js"
     ],
     "ts-node": {
         "esm": true