add tests for checkEncode and checkDecode

test/base58.js

@@ -19,4 +19,31 @@ describe('base58', function() {
             assert.equal(base58.encode(conv.hexToBytes(hex)), enc);
         })
     })
+
+    describe('checkEncode', function() {
+        it('handles known examples', function() {
+          var input = [
+            171, 210, 178, 125, 2, 16, 86, 184, 248, 88, 235,
+            163, 244, 160, 83, 156, 184, 186, 45, 167, 169, 164,
+            67, 125, 163, 89, 106, 243, 207, 193, 149, 206
+          ]
+          var vbyte = 239
+
+          assert.equal(base58.checkEncode(input, vbyte),
+                       '92tb9mjz6q9eKZjYvLsgk87kPrMoh7BGRumSzPeUGhmigtsfrbP');
+        })
+    })
+
+    describe('checkDecode', function() {
+        it('handles known examples', function() {
+          var input = '1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa'
+          var expected =  [
+            98, 233, 7, 177, 92, 191, 39, 213, 66, 83,
+            153, 235, 246, 240, 251, 80, 235, 184, 143, 24
+          ];
+          expected.version = 0
+
+          assert.deepEqual(base58.checkDecode(input), expected);
+        })
+    })
 })