Impl PartialEq for ErrorKind

Closes #125

src/decoding.rs

@@ -262,7 +262,6 @@ pub fn dangerous_insecure_decode_with_validation<T: DeserializeOwned>(
     Ok(TokenData { header, claims: decoded_claims })
 }
 
-
 /// Decode a JWT without any signature verification/validations and return its [Header](struct.Header.html).
 ///
 /// If the token has an invalid format (ie 3 parts separated by a `.`), it will return an error.

src/errors.rs

@@ -123,6 +123,12 @@ impl fmt::Display for Error {
     }
 }
 
+impl PartialEq for ErrorKind {
+    fn eq(&self, other: &Self) -> bool {
+        format!("{:?}", self) == format!("{:?}", other)
+    }
+}
+
 impl From<base64::DecodeError> for Error {
     fn from(err: base64::DecodeError) -> Error {
         new_error(ErrorKind::Base64(err))