Implement JSON responses for EMR (for Boto3)

tests/test_emr/test_emr_boto3.py

@@ -0,0 +1,46 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+import boto3
+import sure  # noqa
+
+from moto import mock_emr
+
+
+@mock_emr
+def test_run_job_flow():
+    client = boto3.client('emr', region_name='us-east-1')
+    cluster_id = client.run_job_flow(
+        Name='cluster',
+        Instances={
+            'MasterInstanceType': 'c3.xlarge',
+            'SlaveInstanceType': 'c3.xlarge',
+            'InstanceCount': 3,
+            'Placement': {'AvailabilityZone': 'us-east-1a'},
+            'KeepJobFlowAliveWhenNoSteps': True,
+        },
+        VisibleToAllUsers=True,
+    )
+    cluster_id.should.have.key('JobFlowId')
+
+
+@mock_emr
+def test_list_clusters():
+    client = boto3.client('emr', region_name='us-east-1')
+    client.run_job_flow(
+        Name='cluster',
+        Instances={
+            'MasterInstanceType': 'c3.xlarge',
+            'SlaveInstanceType': 'c3.xlarge',
+            'InstanceCount': 3,
+            'Placement': {'AvailabilityZone': 'us-east-1a'},
+            'KeepJobFlowAliveWhenNoSteps': True,
+        },
+        VisibleToAllUsers=True,
+    )
+    summary = client.list_clusters()
+    clusters = summary['Clusters']
+    clusters.should.have.length_of(1)
+    cluster = clusters[0]
+    cluster['NormalizedInstanceHours'].should.equal(0)
+    cluster['Status']['State'].should.equal("RUNNING")