Issue #49: Test for forwarding socket exceptions

test/error_test.dart

@@ -2,23 +2,35 @@ import 'package:redis/redis.dart';
 import 'package:test/test.dart';
 
 import 'main.dart';
+import 'dart:io';
+
+Future<Command> generate_connect_broken() {
+  return RedisConnection().connect("localhost", 2);
+}
 
 main() {
   group("Throw  received Redis Errors", () {
     test("Expect error when sending Garbage", () async {
       Command cmd = await generate_connect();
-
-      expect(cmd.send_object("GARBAGE"), throwsA(isRedisError));
+      expect(() => cmd.send_object("GARBAGE"), throwsA(isRedisError));
     });
   });
 
   group("Recover after received Redis Errors", () {
     test("Expect error when sending Garbage 2", () async {
       Command cmd = await generate_connect();
-      expect(cmd.send_object(["GARBAGE"]), throwsA(isRedisError));
+      expect(() => cmd.send_object(["GARBAGE"]), throwsA(isRedisError));
       // next two commands over same connection should be fine
-      expect(await cmd.send_object(["SET","garbage_test","grb"]),equals("OK"));
-      expect(await cmd.send_object(["GET","garbage_test"]),equals("grb"));
+      var ok = await cmd.send_object(["SET", "garbage_test", "grb"]);
+      expect(ok, equals("OK"));
+      var v = await cmd.send_object(["GET", "garbage_test"]);
+      expect(v, equals("grb"));
+    });
+  });
+
+  group("Handle low lewel error", () {
+    test("handle error that is out of our contoll", () {
+      expect(generate_connect_broken, throwsA(isA<SocketException>()));
     });
   });
 }