Added edge cases to base64 url encoding decoding, grouped utils tests

tests/ably/utils.test.ts

@@ -1,45 +1,58 @@
 import { fromBase64UrlEncoded, parseJwt, toBase64UrlEncoded, toTokenDetails } from '../../src/channel/ably/utils';
 
 describe('Utils', () => {
-    test('should parse JWT properly', () => {
-        const token =
+    describe('JWT handling', () => {
+        test('should parse JWT properly', () => {
+            const token =
             'eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiIsImtpZCI6ImFiY2QifQ.eyJpYXQiOjE2NTQ2MzQyMTIsImV4cCI6MTY1NDYzNzgxMiwieC1hYmx5LWNsaWVudElkIjoidXNlcjEyMyIsIngtYWJseS1jYXBhYmlsaXR5Ijoie1wicHVibGljOipcIjpbXCJzdWJzY3JpYmVcIixcImhpc3RvcnlcIixcImNoYW5uZWwtbWV0YWRhdGFcIl19In0.GenM5EyUeJvgAGBD_EG-89FueNKWtyRZyi61s9G2Bs4';
-        const expectedHeader = {
-            alg: 'HS256',
-            kid: 'abcd',
-            typ: 'JWT',
-        };
-        const expectedPayload = {
-            iat: 1654634212,
-            exp: 1654637812,
-            'x-ably-clientId': 'user123',
-            'x-ably-capability': '{"public:*":["subscribe","history","channel-metadata"]}',
-        };
+            const expectedHeader = {
+                alg: 'HS256',
+                kid: 'abcd',
+                typ: 'JWT',
+            };
+            const expectedPayload = {
+                iat: 1654634212,
+                exp: 1654637812,
+                'x-ably-clientId': 'user123',
+                'x-ably-capability': '{"public:*":["subscribe","history","channel-metadata"]}',
+            };
 
-        expect(parseJwt(token).header).toStrictEqual(expectedHeader);
-        expect(parseJwt(token).payload).toStrictEqual(expectedPayload);
-    });
-
-    test('should convert to tokenDetails', () => {
-        const token =
+            expect(parseJwt(token).header).toStrictEqual(expectedHeader);
+            expect(parseJwt(token).payload).toStrictEqual(expectedPayload);
+        });
+    
+        test('should convert to tokenDetails', () => {
+            const token =
             'eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiIsImtpZCI6ImFiY2QifQ.eyJpYXQiOjE2NTQ2MzQyMTIsImV4cCI6MTY1NDYzNzgxMiwieC1hYmx5LWNsaWVudElkIjoidXNlcjEyMyIsIngtYWJseS1jYXBhYmlsaXR5Ijoie1wicHVibGljOipcIjpbXCJzdWJzY3JpYmVcIixcImhpc3RvcnlcIixcImNoYW5uZWwtbWV0YWRhdGFcIl19In0.GenM5EyUeJvgAGBD_EG-89FueNKWtyRZyi61s9G2Bs4';
-        const tokenDetails = toTokenDetails(token);
-        expect(tokenDetails.clientId).toBe('user123');
-        expect(tokenDetails.expires).toBe(1654637812000);
-        expect(tokenDetails.issued).toBe(1654634212000);
-        expect(tokenDetails.token).toBe(token);
+            const tokenDetails = toTokenDetails(token);
+            expect(tokenDetails.clientId).toBe('user123');
+            expect(tokenDetails.expires).toBe(1654637812000);
+            expect(tokenDetails.issued).toBe(1654634212000);
+            expect(tokenDetails.token).toBe(token);
+        });
     });
 
-    test('should encode text into Base64UrlEncoded string', () => {
-        const normalText = "laravel-echo codebase is of best quality, period!"
-        const encodedText = toBase64UrlEncoded(normalText);
-        expect(encodedText).toBe('bGFyYXZlbC1lY2hvIGNvZGViYXNlIGlzIG9mIGJlc3QgcXVhbGl0eSwgcGVyaW9kIQ')
-    });
+    describe('Base64 URL encoding/decoding', () => {
+        test('should encode text into Base64UrlEncoded string', () => {
+            const normalText = "laravel-echo codebase is of best quality, period!"
+            const encodedText = toBase64UrlEncoded(normalText);
+            expect(encodedText).toBe('bGFyYXZlbC1lY2hvIGNvZGViYXNlIGlzIG9mIGJlc3QgcXVhbGl0eSwgcGVyaW9kIQ')
 
-    test('should decode Base64UrlEncoded string into text', () => {
-        const normalText = "bGFyYXZlbC1lY2hvIGNvZGViYXNlIGlzIG9mIGJlc3QgcXVhbGl0eSwgcGVyaW9kIQ"
-        const encodedText = fromBase64UrlEncoded(normalText);
-        expect(encodedText).toBe('laravel-echo codebase is of best quality, period!')
-    });
+            // edge cases
+            expect(toBase64UrlEncoded('')).toBe('');
+            expect(toBase64UrlEncoded('Hello, 世界! 🌍')).toBe('SGVsbG8sIOS4lueVjCEg8J-MjQ');
+            expect(toBase64UrlEncoded('a')).toBe('YQ');  // Would be 'YQ==' in standard Base64
+        });
+
+        test('should decode Base64UrlEncoded string into text', () => {
+            const normalText = "bGFyYXZlbC1lY2hvIGNvZGViYXNlIGlzIG9mIGJlc3QgcXVhbGl0eSwgcGVyaW9kIQ"
+            const encodedText = fromBase64UrlEncoded(normalText);
+            expect(encodedText).toBe('laravel-echo codebase is of best quality, period!')
 
+            // edge cases 
+            expect(fromBase64UrlEncoded('')).toBe('');
+            expect(fromBase64UrlEncoded('SGVsbG8sIOS4lueVjCEg8J-MjQ')).toBe('Hello, 世界! 🌍');
+            expect(fromBase64UrlEncoded('YQ')).toBe('a');  // No padding in Base64Url
+        });
+    });
 });