Introduce new cancelled error type

Author: rubengees

library/src/main/java/me/proxer/library/api/ProxerCall.java

@@ -135,7 +135,11 @@ private ProxerException processNonProxerError(@NotNull final Throwable error) {
         if (error instanceof SocketTimeoutException) {
             return new ProxerException(ProxerException.ErrorType.TIMEOUT, error);
         } else if (error instanceof IOException) {
-            return new ProxerException(ProxerException.ErrorType.IO, error);
+            if (error.getMessage().equals("Canceled")) {
+                return new ProxerException(ProxerException.ErrorType.CANCELLED, error);
+            } else {
+                return new ProxerException(ProxerException.ErrorType.IO, error);
+            }
         } else if (error instanceof JsonDataException) {
             return new ProxerException(ProxerException.ErrorType.PARSING, error);
         } else {

library/src/main/java/me/proxer/library/api/ProxerException.java

@@ -100,6 +100,7 @@ public enum ErrorType {
         TIMEOUT,
         IO,
         PARSING,
+        CANCELLED,
         UNKNOWN
     }
 

library/src/test/java/me/proxer/library/api/ProxerCallTest.java

@@ -58,6 +58,26 @@ public void testInvalidDataError() throws IOException {
                         "PARSING ErrorType"));
     }
 
+    @Test(timeout = 1000L)
+    public void testCancelledError() throws IOException, InterruptedException {
+        final CountDownLatch lock = new CountDownLatch(1);
+
+        server.enqueue(new MockResponse().setBody(fromResource("news.json")));
+
+        final ProxerCall<List<NewsArticle>> call = api.notifications().news().build();
+
+        call.enqueue(result -> {
+            // Failed. The lock will never be counted down and timeout.
+        }, exception -> {
+            assertThat(exception.getErrorType()).isEqualTo(ErrorType.CANCELLED);
+
+            lock.countDown();
+        });
+
+        call.cancel();
+        lock.await();
+    }
+
     @Test
     public void testServerError() throws Exception {
         server.enqueue(new MockResponse().setBody(fromResource("conferences_error.json")));