chore(): add test cases and adjust ci

.travis.yml

@@ -1,5 +1,7 @@
 language: node_js
 node_js:
-  - "5"
+  - "12.14.1"
 script:
+  - npm run lint
   - npm test
+  - npm run build

index.spec.ts

@@ -0,0 +1,36 @@
+import { TextDecoder } from 'util'
+import { default as WebVTT, moduleName } from './index'
+
+describe('WebVTT', () => {
+    let file: Blob;
+
+    beforeEach(() => {
+        file = new Blob([new Uint8Array([])], { type: 'text/plain' });
+        (global as any).TextDecoder = TextDecoder;
+        (global.URL as any).createObjectURL = jest.fn().mockImplementation((text) => 'blob:some-valid-url');
+    })
+
+    it('should return a promise', () => {
+        expect(WebVTT(file)).toBeInstanceOf(Promise);
+    });
+    it('should return a valid return', async () => {
+        expect(await WebVTT(file)).toBe('blob:some-valid-url');
+    });
+    it('should throw if undefined or wrong resource provided', async () => {
+        try {
+            const webVtt = await WebVTT(undefined as any);
+        } catch (e: any) {
+            expect(e.message).toContain(moduleName);
+            expect(e.message).toContain('Blob');
+        }
+    });
+    it('should throw TextDecoder is not defined', async () => {
+        (global as any).TextDecoder = undefined;
+        try {
+            const webVtt = await WebVTT(file);
+        } catch (e: any) {
+            expect(e.message).toContain(moduleName);
+            expect(e.message).toContain('TextDecoder');
+        }
+    });
+});

index.ts

@@ -1,4 +1,4 @@
-const moduleName = 'toWebVTT';
+export const moduleName = 'toWebVTT';
 
 const blobToBufferOrString = (blob: Blob, readAs: 'string' | 'buffer'): Promise<Uint8Array | String> => 
   new Promise((resolve, reject) => {
@@ -42,7 +42,7 @@ const toWebVTT = async (resource: Blob): Promise<string> => {
     throw (new Error(`${moduleName}: No TextDecoder constructor found`));
   }
   if (!(resource instanceof Blob)) {
-    throw (new Error(`${moduleName}: Expecting resource to be a Blob but something else found.`));
+    throw new Error(`${moduleName}: Expecting resource to be a Blob but something else found.`);
   }
   let text;
   const vttString = 'WEBVTT FILE\r\n\r\n';

jest.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'jsdom',
+};

package.json

@@ -8,7 +8,8 @@
     "lib/index.d.ts"
   ],
   "scripts": {
-    "test": "./node_modules/.bin/eslint ./index.js",
+    "test": "./node_modules/.bin/jest",
+    "lint": "./node_modules/.bin/eslint ./index.js",
     "build": "rm -rf lib && tsc",
     "minor": "npm version minor && npm publish",
     "major": "npm version major && npm publish",
@@ -45,11 +46,14 @@
   },
   "homepage": "https://github.com/imshaikot/srt-webvtt#readme",
   "devDependencies": {
+    "@types/jest": "^27.0.2",
     "eslint": "^4.15.0",
     "eslint-config-airbnb": "^16.1.0",
     "eslint-plugin-import": "^2.8.0",
     "eslint-plugin-jsx-a11y": "^6.0.3",
     "eslint-plugin-react": "^7.5.1",
+    "jest": "^27.3.1",
+    "ts-jest": "^27.0.7",
     "typescript": "^4.4.4"
   }
 }

tsconfig.json

@@ -10,6 +10,6 @@
     },
     "exclude": [
       "node_modules",
-      "dist"
+      "lib"
     ]
   }