Adds unit testing for jws

jwt/jose_test.go

@@ -86,3 +86,18 @@ func (s *JOSESuite) TestHandlesPrivateHeaders(c *C) {
 		c.Assert(res, DeepEquals, j)
 	}
 }
+
+func (s *JOSESuite) TestEncodingIsCompact(c *C) {
+	j := &JOSE{
+		Algorithm: "none",
+		Critical:  []string{"exp", "foo"},
+	}
+	// it does not print empty fields.
+	data, err := j.EncodeJSON()
+	c.Check(err, IsNil)
+	c.Check(string(data), Equals, `{"alg":"none","crit":["exp","foo"]}`)
+
+	b64, err := j.EncodeBase64()
+	c.Check(err, IsNil)
+	c.Check(len(b64), Equals, 47)
+}