Merge pull request #2761 from bblommers/bugfix/1427

EMR - Return start time of first step

moto/emr/models.py

@@ -86,6 +86,9 @@ class FakeStep(BaseModel):
         self.start_datetime = None
         self.state = state
 
+    def start(self):
+        self.start_datetime = datetime.now(pytz.utc)
+
 
 class FakeCluster(BaseModel):
     def __init__(
@@ -204,6 +207,8 @@ class FakeCluster(BaseModel):
 
         self.start_cluster()
         self.run_bootstrap_actions()
+        if self.steps:
+            self.steps[0].start()
 
     @property
     def instance_groups(self):

moto/emr/responses.py

@@ -835,7 +835,7 @@ LIST_STEPS_TEMPLATE = """<ListStepsResponse xmlns="http://elasticmapreduce.amazo
             {% if step.end_datetime is not none %}
             <EndDateTime>{{ step.end_datetime.isoformat() }}</EndDateTime>
             {% endif %}
-            {% if step.ready_datetime is not none %}
+            {% if step.start_datetime is not none %}
             <StartDateTime>{{ step.start_datetime.isoformat() }}</StartDateTime>
             {% endif %}
           </Timeline>