From 75f2c56a3643b053fbddf458e6e48e5a8e5e6214 Mon Sep 17 00:00:00 2001
From: Steve Pulec <spulec@gmail.com>
Date: Tue, 30 Oct 2018 22:03:09 -0400
Subject: [PATCH] Fix ecs error response to be json.

---
 moto/ecs/exceptions.py           |  4 +++-
 tests/test_ecs/test_ecs_boto3.py | 17 ++++++++++++++++-
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/moto/ecs/exceptions.py b/moto/ecs/exceptions.py
index c23d6fd1d..a780dc7c2 100644
--- a/moto/ecs/exceptions.py
+++ b/moto/ecs/exceptions.py
@@ -8,4 +8,6 @@ class ServiceNotFoundException(RESTError):
     def __init__(self, service_name):
         super(ServiceNotFoundException, self).__init__(
             error_type="ServiceNotFoundException",
-            message="The service {0} does not exist".format(service_name))
+            message="The service {0} does not exist".format(service_name),
+            template='error_json',
+            )
diff --git a/tests/test_ecs/test_ecs_boto3.py b/tests/test_ecs/test_ecs_boto3.py
index 70c1463ee..a0e8318da 100644
--- a/tests/test_ecs/test_ecs_boto3.py
+++ b/tests/test_ecs/test_ecs_boto3.py
@@ -631,7 +631,22 @@ def test_delete_service():
     response['service']['schedulingStrategy'].should.equal('REPLICA')
     response['service']['taskDefinition'].should.equal(
         'arn:aws:ecs:us-east-1:012345678910:task-definition/test_ecs_task:1')
-        
+
+
+@mock_ecs
+def test_update_non_existant_service():
+    client = boto3.client('ecs', region_name='us-east-1')
+    try:
+        client.update_service(
+            cluster="my-clustet",
+            service="my-service",
+            desiredCount=0,
+        )
+    except ClientError as exc:
+        error_code = exc.response['Error']['Code']
+        error_code.should.equal('ServiceNotFoundException')
+    else:
+        raise Exception("Didn't raise ClientError")
 
 
 @mock_ec2