partially completed moto changes for describe_spot_price_history

partial_moto_fixes.patch

diff -ru ./lib/python3.6/site-packages/moto.orig/ec2/models.py ./lib/python3.6/site-packages/moto/ec2/models.py
--- ./lib/python3.6/site-packages/moto.orig/ec2/models.py	2021-01-12 22:15:05.958727781 +0000
+++ ./lib/python3.6/site-packages/moto/ec2/models.py	2021-05-03 18:23:48.524026897 +0000
@@ -4041,6 +4041,7 @@
 
 
 class SpotInstanceRequest(BotoSpotRequest, TaggedEC2Resource):
+    test_request_state = ""
     def __init__(
         self,
         ec2_backend,
@@ -4100,6 +4101,7 @@
             ls.groups.append(default_group)
 
         self.instance = self.launch_instance()
+        self.last_request_state = ""
 
     def get_filter_value(self, filter_name):
         if filter_name == "state":
@@ -4184,12 +4186,21 @@
             )
             self.spot_instance_requests[spot_request_id] = request
             requests.append(request)
+
         return requests
 
     @Model.prop("SpotInstanceRequest")
     def describe_spot_instance_requests(self, filters=None):
         requests = self.spot_instance_requests.values()
 
+        # Toggle out status between "pending-evaluation" and "fulfilled" (initially its
+        # "pending-evaluation".
+        for request in requests:
+            if request.test_request_state == "pending-evaluation":
+                request.test_request_state = "fulfilled"
+            else:
+                request.test_request_state = "pending-evaluation"
+
         return generic_filter(filters, requests)
 
     def cancel_spot_instance_requests(self, request_ids):
Binary files ./lib/python3.6/site-packages/moto.orig/ec2/responses/__pycache__/spot_instances.cpython-36.pyc and ./lib/python3.6/site-packages/moto/ec2/responses/__pycache__/spot_instances.cpython-36.pyc differ
diff -ru ./lib/python3.6/site-packages/moto.orig/ec2/responses/spot_instances.py ./lib/python3.6/site-packages/moto/ec2/responses/spot_instances.py
--- ./lib/python3.6/site-packages/moto.orig/ec2/responses/spot_instances.py	2021-01-13 00:17:42.027718486 +0000
+++ ./lib/python3.6/site-packages/moto/ec2/responses/spot_instances.py	2021-05-03 18:24:50.521022348 +0000
@@ -2,6 +2,8 @@
 from moto.core.responses import BaseResponse
 from moto.ec2.utils import filters_from_querystring
 
+from twisted.python import log
+
 
 class SpotInstances(BaseResponse):
     def cancel_spot_instance_requests(self):
@@ -32,12 +34,14 @@
         filters = filters_from_querystring(self.querystring)
         requests = self.ec2_backend.describe_spot_instance_requests(filters=filters)
         template = self.response_template(DESCRIBE_SPOT_INSTANCES_TEMPLATE)
+
         return template.render(requests=requests)
 
     def describe_spot_price_history(self):
-        raise NotImplementedError(
-            "SpotInstances.describe_spot_price_history is not yet implemented"
-        )
+        filters = filters_from_querystring(self.querystring)
+        requests = self.ec2_backend.describe_spot_instance_requests(filters=filters)
+        template = self.response_template(DESCRIBE_SPOT_PRICE_HISTORY_TEMPLATE)
+        return template.render(requests=requests)
 
     def request_spot_instances(self):
         price = self._get_param("SpotPrice")
@@ -148,7 +152,7 @@
       <type>{{ request.type }}</type>
       <state>{{ request.state }}</state>
       <status>
-        <code>pending-evaluation</code>
+        <code>fulfilled</code>
         <updateTime>2015-01-01T00:00:00.000Z</updateTime>
         <message>Your Spot request has been submitted for review, and is pending evaluation.</message>
       </status>
@@ -228,3 +232,18 @@
     {% endfor %}
   </spotInstanceRequestSet>
 </CancelSpotInstanceRequestsResponse>"""
+
+DESCRIBE_SPOT_PRICE_HISTORY_TEMPLATE = """<DescribeSpotPriceHistoryResponse xmlns="http://ec2.amazonaws.com/doc/2013-10-15/">
+  <requestId>59dbff89-35bd-4eac-99ed-be587EXAMPLE</requestId>
+  <spotPriceHistorySet>
+    {% for request in requests %}
+    <item>
+      <spotInstanceRequestId>{{ request.id }}</spotInstanceRequestId>
+      <productDescription>Linux/UNIX (Amazon VPC)</productDescription>
+      <instanceType>m1.large</instanceType>
+      <spotPrice>0.080000</spotPrice>
+      <availabilityZone>us-west-1a</availabilityZone>
+    </item>
+    {% endfor %}
+  </spotPriceHistorySet>
+</DescribeSpotPriceHistoryResponse>"""