refactor b64 tests

src/jwt/__tests__/base64.spec.js

@@ -1,17 +1,31 @@
 import * as base64 from '../base64';
 
 describe('helpers base64 url', function() {
-  it('padding', function() {
-    expect(base64.padding('')).toBe('');
-    expect(base64.padding('a')).toBe('a===');
-    expect(base64.padding('ab')).toBe('ab==');
-    expect(base64.padding('abc')).toBe('abc=');
-    expect(base64.padding('abcd')).toBe('abcd');
-    expect(base64.padding('abced')).toBe('abced===');
-    expect(base64.padding(base64.padding('abc'))).toBe('abc=');
+  describe('padding', function() {
+    it('does not add to multiple of 4', function() {
+      expect(base64.padding('')).toBe('');
+      expect(base64.padding('abcd')).toBe('abcd');
+    });
+    it('adds to non multiple of 4', function() {
+      expect(base64.padding('a')).toBe('a===');
+      expect(base64.padding('ab')).toBe('ab==');
+      expect(base64.padding('abc')).toBe('abc=');
+      expect(base64.padding('abced')).toBe('abced===');
+    });
+    it('does not change already padded value', function() {
+      const padded = base64.padding('abc');
+      expect(padded).toBe('abc=');
+      const again = base64.padding(padded);
+      expect(again).toBe('abc=');
+    });
   });
 
-  it('decode to hex', function() {
-    expect(base64.decodeToHEX('AQAB')).toBe('010001');
+  describe('decoding to hex', function() {
+    it('should convert base64 input into hex output', function() {
+      expect(base64.decodeToHEX('AQAB')).toBe('010001');
+      expect(base64.decodeToHEX('uGbXWiK3dQTyCbX5')).toBe(
+        'b866d75a22b77504f209b5f9',
+      );
+    });
   });
 });