Avoid printing messages to the console. (#365)

CONTRIBUTING.md

@@ -30,6 +30,18 @@ GitHub.dart is committed to efficiency as much as possible. If your code is not
 
 Pull Request rejections are not a bad thing. It just means you need to fix something. Perhaps it is important to define 'rejection' as it is used in this case. A rejection is when a GitHub.dart committer comments on a Pull Request with a comment like 'rejected due to incorrect formatting'.
 
+## Tests
+
+To run the complete test suite you will need to install
+`octokit/fixtures-server`.
+
+```
+npm install --global @octokit/fixtures-server
+```
+
+Tests can be run using `make test`, which will start up a local mock
+GitHub and execute tests against it using your localhost port 3000.
+
 ## Contacting Us
 
 - IRC: `#directcode on irc.esper.net and irc.freenode.net`

lib/src/common/github.dart

@@ -433,7 +433,6 @@ class GitHub {
   /// Internal method to handle status codes
   ///
   Never handleStatusCode(http.Response response) {
-    print(response.body);
     String? message = '';
     List<Map<String, String>>? errors;
     if (response.headers['content-type']!.contains('application/json')) {
@@ -450,7 +449,7 @@ class GitHub {
           }
         }
       } catch (ex) {
-        print(ex);
+        throw UnknownError(this, ex.toString());
       }
     }
     switch (response.statusCode) {