diff --git a/moto/cloudformation/parsing.py b/moto/cloudformation/parsing.py
index 690b95631..06b460495 100644
--- a/moto/cloudformation/parsing.py
+++ b/moto/cloudformation/parsing.py
@@ -35,6 +35,7 @@ MODEL_MAP = {
     "AWS::EC2::RouteTable": ec2_models.RouteTable,
     "AWS::EC2::SecurityGroup": ec2_models.SecurityGroup,
     "AWS::EC2::SecurityGroupIngress": ec2_models.SecurityGroupIngress,
+    "AWS::EC2::SpotFleet": ec2_models.SpotFleetRequest,
     "AWS::EC2::Subnet": ec2_models.Subnet,
     "AWS::EC2::SubnetRouteTableAssociation": ec2_models.SubnetRouteTableAssociation,
     "AWS::EC2::Volume": ec2_models.Volume,
diff --git a/moto/ec2/models.py b/moto/ec2/models.py
index 902ebdac4..3c4da13b4 100755
--- a/moto/ec2/models.py
+++ b/moto/ec2/models.py
@@ -15,7 +15,7 @@ from boto.ec2.launchspecification import LaunchSpecification
 
 from moto.core import BaseBackend
 from moto.core.models import Model
-from moto.core.utils import iso_8601_datetime_with_milliseconds
+from moto.core.utils import iso_8601_datetime_with_milliseconds, camelcase_to_underscores
 from .exceptions import (
     EC2ClientError,
     DependencyViolationError,
@@ -81,6 +81,7 @@ from .utils import (
     split_route_id,
     random_security_group_id,
     random_snapshot_id,
+    random_spot_fleet_request_id,
     random_spot_request_id,
     random_subnet_id,
     random_subnet_association_id,
@@ -2565,6 +2566,170 @@ class SpotRequestBackend(object):
         return requests
 
 
+class SpotFleetLaunchSpec(object):
+    def __init__(self, ebs_optimized, group_set, iam_instance_profile, image_id,
+        instance_type, key_name, monitoring, spot_price, subnet_id, user_data,
+        weighted_capacity):
+        self.ebs_optimized = ebs_optimized
+        self.group_set = group_set
+        self.iam_instance_profile = iam_instance_profile
+        self.image_id = image_id
+        self.instance_type = instance_type
+        self.key_name = key_name
+        self.monitoring = monitoring
+        self.spot_price = spot_price
+        self.subnet_id = subnet_id
+        self.user_data = user_data
+        self.weighted_capacity = float(weighted_capacity)
+
+
+class SpotFleetRequest(TaggedEC2Resource):
+
+    def __init__(self, ec2_backend, spot_fleet_request_id, spot_price,
+            target_capacity, iam_fleet_role, allocation_strategy, launch_specs):
+
+        self.ec2_backend = ec2_backend
+        self.id = spot_fleet_request_id
+        self.spot_price = spot_price
+        self.target_capacity = int(target_capacity)
+        self.iam_fleet_role = iam_fleet_role
+        self.allocation_strategy = allocation_strategy
+        self.state = "active"
+        self.fulfilled_capacity = self.target_capacity
+
+        self.launch_specs = []
+        for spec in launch_specs:
+            self.launch_specs.append(SpotFleetLaunchSpec(
+                    ebs_optimized=spec['ebs_optimized'],
+                    group_set=[val for key, val in spec.items() if key.startswith("group_set")],
+                    iam_instance_profile=spec.get('iam_instance_profile._arn'),
+                    image_id=spec['image_id'],
+                    instance_type=spec['instance_type'],
+                    key_name=spec.get('key_name'),
+                    monitoring=spec.get('monitoring._enabled'),
+                    spot_price=spec.get('spot_price', self.spot_price),
+                    subnet_id=spec['subnet_id'],
+                    user_data=spec.get('user_data'),
+                    weighted_capacity=spec['weighted_capacity'],
+                )
+            )
+
+        self.spot_requests = []
+        self.create_spot_requests()
+
+    @property
+    def physical_resource_id(self):
+        return self.id
+
+    @classmethod
+    def create_from_cloudformation_json(cls, resource_name, cloudformation_json, region_name):
+        properties = cloudformation_json['Properties']['SpotFleetRequestConfigData']
+        ec2_backend = ec2_backends[region_name]
+
+        spot_price = properties['SpotPrice']
+        target_capacity = properties['TargetCapacity']
+        iam_fleet_role = properties['IamFleetRole']
+        allocation_strategy = properties['AllocationStrategy']
+        launch_specs = properties["LaunchSpecifications"]
+        launch_specs = [
+            dict([(camelcase_to_underscores(key), val) for key, val in launch_spec.items()])
+            for launch_spec
+            in launch_specs
+        ]
+
+        spot_fleet_request = ec2_backend.request_spot_fleet(spot_price,
+            target_capacity, iam_fleet_role, allocation_strategy, launch_specs)
+
+        return spot_fleet_request
+
+
+    def get_launch_spec_counts(self):
+        weight_map = defaultdict(int)
+
+        if self.allocation_strategy == 'diversified':
+            weight_so_far = 0
+            launch_spec_index = 0
+            while True:
+                launch_spec = self.launch_specs[launch_spec_index % len(self.launch_specs)]
+                weight_map[launch_spec] += 1
+                weight_so_far += launch_spec.weighted_capacity
+                if weight_so_far >= self.target_capacity:
+                    break
+                launch_spec_index += 1
+        else:  # lowestPrice
+            cheapest_spec = sorted(self.launch_specs, key=lambda spec: float(spec.spot_price))[0]
+            extra = 1 if self.target_capacity % cheapest_spec.weighted_capacity else 0
+            weight_map[cheapest_spec] = int(self.target_capacity // cheapest_spec.weighted_capacity) + extra
+
+        return weight_map.items()
+
+    def create_spot_requests(self):
+        for launch_spec, count in self.get_launch_spec_counts():
+            requests = self.ec2_backend.request_spot_instances(
+                                price=launch_spec.spot_price,
+                                image_id=launch_spec.image_id,
+                                count=count,
+                                type="persistent",
+                                valid_from=None,
+                                valid_until=None,
+                                launch_group=None,
+                                availability_zone_group=None,
+                                key_name=launch_spec.key_name,
+                                security_groups=launch_spec.group_set,
+                                user_data=launch_spec.user_data,
+                                instance_type=launch_spec.instance_type,
+                                placement=None,
+                                kernel_id=None,
+                                ramdisk_id=None,
+                                monitoring_enabled=launch_spec.monitoring,
+                                subnet_id=launch_spec.subnet_id,
+            )
+            self.spot_requests.extend(requests)
+        return self.spot_requests
+
+    def terminate_instances(self):
+        pass
+
+
+class SpotFleetBackend(object):
+    def __init__(self):
+        self.spot_fleet_requests = {}
+        super(SpotFleetBackend, self).__init__()
+
+    def request_spot_fleet(self, spot_price, target_capacity, iam_fleet_role,
+            allocation_strategy, launch_specs):
+
+        spot_fleet_request_id = random_spot_fleet_request_id()
+        request = SpotFleetRequest(self, spot_fleet_request_id, spot_price,
+            target_capacity, iam_fleet_role, allocation_strategy, launch_specs)
+        self.spot_fleet_requests[spot_fleet_request_id] = request
+        return request
+
+    def get_spot_fleet_request(self, spot_fleet_request_id):
+        return self.spot_fleet_requests[spot_fleet_request_id]
+
+    def describe_spot_fleet_instances(self, spot_fleet_request_id):
+        spot_fleet = self.get_spot_fleet_request(spot_fleet_request_id)
+        return spot_fleet.spot_requests
+
+    def describe_spot_fleet_requests(self, spot_fleet_request_ids):
+        requests = self.spot_fleet_requests.values()
+
+        if spot_fleet_request_ids:
+            requests = [request for request in requests if request.id in spot_fleet_request_ids]
+
+        return requests
+
+    def cancel_spot_fleet_requests(self, spot_fleet_request_ids, terminate_instances):
+        spot_requests = []
+        for spot_fleet_request_id in spot_fleet_request_ids:
+            spot_fleet = self.spot_fleet_requests.pop(spot_fleet_request_id)
+            if terminate_instances:
+                spot_fleet.terminate_instances()
+            spot_requests.append(spot_fleet)
+        return spot_requests
+
+
 class ElasticAddress(object):
     def __init__(self, domain):
         self.public_ip = random_ip()
@@ -3189,10 +3354,10 @@ class EC2Backend(BaseBackend, InstanceBackend, TagBackend, AmiBackend,
                  NetworkInterfaceBackend, VPNConnectionBackend,
                  VPCPeeringConnectionBackend,
                  RouteTableBackend, RouteBackend, InternetGatewayBackend,
-                 VPCGatewayAttachmentBackend, SpotRequestBackend,
-                 ElasticAddressBackend, KeyPairBackend, DHCPOptionsSetBackend,
-                 NetworkAclBackend, VpnGatewayBackend, CustomerGatewayBackend,
-                 NatGatewayBackend):
+                 VPCGatewayAttachmentBackend, SpotFleetBackend,
+                 SpotRequestBackend,ElasticAddressBackend, KeyPairBackend,
+                 DHCPOptionsSetBackend, NetworkAclBackend, VpnGatewayBackend,
+                 CustomerGatewayBackend, NatGatewayBackend):
 
     def __init__(self, region_name):
         super(EC2Backend, self).__init__()
diff --git a/moto/ec2/responses/__init__.py b/moto/ec2/responses/__init__.py
index d939178fb..2049998ad 100644
--- a/moto/ec2/responses/__init__.py
+++ b/moto/ec2/responses/__init__.py
@@ -19,6 +19,7 @@ from .placement_groups import PlacementGroups
 from .reserved_instances import ReservedInstances
 from .route_tables import RouteTables
 from .security_groups import SecurityGroups
+from .spot_fleets import SpotFleets
 from .spot_instances import SpotInstances
 from .subnets import Subnets
 from .tags import TagResponse
@@ -52,6 +53,7 @@ class EC2Response(
     ReservedInstances,
     RouteTables,
     SecurityGroups,
+    SpotFleets,
     SpotInstances,
     Subnets,
     TagResponse,
diff --git a/moto/ec2/responses/spot_fleets.py b/moto/ec2/responses/spot_fleets.py
new file mode 100644
index 000000000..f49b60e68
--- /dev/null
+++ b/moto/ec2/responses/spot_fleets.py
@@ -0,0 +1,122 @@
+from __future__ import unicode_literals
+from moto.core.responses import BaseResponse
+
+
+class SpotFleets(BaseResponse):
+
+    def cancel_spot_fleet_requests(self):
+        spot_fleet_request_ids = self._get_multi_param("SpotFleetRequestId.")
+        terminate_instances = self._get_param("TerminateInstances")
+        spot_fleets = self.ec2_backend.cancel_spot_fleet_requests(spot_fleet_request_ids, terminate_instances)
+        template = self.response_template(CANCEL_SPOT_FLEETS_TEMPLATE)
+        return template.render(spot_fleets=spot_fleets)
+
+    def describe_spot_fleet_instances(self):
+        spot_fleet_request_id = self._get_param("SpotFleetRequestId")
+
+        spot_requests = self.ec2_backend.describe_spot_fleet_instances(spot_fleet_request_id)
+        template = self.response_template(DESCRIBE_SPOT_FLEET_INSTANCES_TEMPLATE)
+        return template.render(spot_request_id=spot_fleet_request_id, spot_requests=spot_requests)
+
+    def describe_spot_fleet_requests(self):
+        spot_fleet_request_ids = self._get_multi_param("SpotFleetRequestId.")
+
+        requests = self.ec2_backend.describe_spot_fleet_requests(spot_fleet_request_ids)
+        template = self.response_template(DESCRIBE_SPOT_FLEET_TEMPLATE)
+        return template.render(requests=requests)
+
+    def request_spot_fleet(self):
+        spot_config = self._get_dict_param("SpotFleetRequestConfig.")
+        spot_price = spot_config['spot_price']
+        target_capacity = spot_config['target_capacity']
+        iam_fleet_role = spot_config['iam_fleet_role']
+        allocation_strategy = spot_config['allocation_strategy']
+
+        launch_specs = self._get_list_prefix("SpotFleetRequestConfig.LaunchSpecifications")
+
+        request = self.ec2_backend.request_spot_fleet(
+            spot_price=spot_price,
+            target_capacity=target_capacity,
+            iam_fleet_role=iam_fleet_role,
+            allocation_strategy=allocation_strategy,
+            launch_specs=launch_specs,
+        )
+
+        template = self.response_template(REQUEST_SPOT_FLEET_TEMPLATE)
+        return template.render(request=request)
+
+REQUEST_SPOT_FLEET_TEMPLATE = """<RequestSpotFleetResponse xmlns="http://ec2.amazonaws.com/doc/2016-09-15/">
+    <requestId>60262cc5-2bd4-4c8d-98ed-example</requestId>
+    <spotFleetRequestId>{{ request.id }}</spotFleetRequestId>
+</RequestSpotFleetResponse>"""
+
+DESCRIBE_SPOT_FLEET_TEMPLATE = """<DescribeSpotFleetRequestsResponse xmlns="http://ec2.amazonaws.com/doc/2016-09-15/">
+    <requestId>4d68a6cc-8f2e-4be1-b425-example</requestId>
+    <spotFleetRequestConfigSet>
+        {% for request in requests %}
+        <item>
+            <spotFleetRequestId>{{ request.id }}</spotFleetRequestId>
+            <spotFleetRequestState>{{ request.state }}</spotFleetRequestState>
+            <spotFleetRequestConfig>
+                <spotPrice>{{ request.spot_price }}</spotPrice>
+                <targetCapacity>{{ request.target_capacity }}</targetCapacity>
+                <iamFleetRole>{{ request.iam_fleet_role }}</iamFleetRole>
+                <allocationStrategy>{{ request.allocation_strategy }}</allocationStrategy>
+                <fulfilledCapacity>{{ request.fulfilled_capacity }}</fulfilledCapacity>
+                <launchSpecifications>
+                    {% for launch_spec in request.launch_specs %}
+                    <item>
+                        <subnetId>{{ launch_spec.subnet_id }}</subnetId>
+                        <ebsOptimized>{{ launch_spec.ebs_optimized }}</ebsOptimized>
+                        <imageId>{{ launch_spec.image_id }}</imageId>
+                        <instanceType>{{ launch_spec.instance_type }}</instanceType>
+                        <iamInstanceProfile><arn>{{ launch_spec.iam_instance_profile }}</arn></iamInstanceProfile>
+                        <keyName>{{ launch_spec.key_name }}</keyName>
+                        <monitoring><enabled>{{ launch_spec.monitoring }}</enabled></monitoring>
+                        <spotPrice>{{ launch_spec.spot_price }}</spotPrice>
+                        <userData>{{ launch_spec.user_data }}</userData>
+                        <weightedCapacity>{{ launch_spec.weighted_capacity }}</weightedCapacity>
+                        <groupSet>
+                            {% for group in launch_spec.group_set %}
+                            <item>
+                                <groupId>{{ group }}</groupId>
+                            </item>
+                            {% endfor %}
+                        </groupSet>
+                    </item>
+                    {% endfor %}
+                </launchSpecifications>
+            </spotFleetRequestConfig>
+        </item>
+        {% endfor %}
+    </spotFleetRequestConfigSet>
+</DescribeSpotFleetRequestsResponse>"""
+
+DESCRIBE_SPOT_FLEET_INSTANCES_TEMPLATE = """<DescribeSpotFleetInstancesResponse xmlns="http://ec2.amazonaws.com/doc/2016-09-15/">
+    <requestId>cfb09950-45e2-472d-a6a9-example</requestId>
+    <spotFleetRequestId>{{ spot_request_id }}</spotFleetRequestId>
+    <activeInstanceSet>
+        {% for spot_request in spot_requests %}
+        <item>
+            <instanceId>{{ spot_request.instance_id }}</instanceId>
+            <spotInstanceRequestId>{{ spot_request.id }}</spotInstanceRequestId>
+            <instanceType>{{ spot_request.instance_type }}</instanceType>
+        </item>
+        {% endfor %}
+    </activeInstanceSet>
+</DescribeSpotFleetInstancesResponse>
+"""
+
+CANCEL_SPOT_FLEETS_TEMPLATE = """<CancelSpotFleetRequestsResponse xmlns="http://ec2.amazonaws.com/doc/2016-09-15/">
+    <requestId>e12d2fe5-6503-4b4b-911c-example</requestId>
+    <unsuccessfulFleetRequestSet/>
+    <successfulFleetRequestSet>
+        {% for spot_fleet in spot_fleets %}
+        <item>
+            <spotFleetRequestId>{{ spot_fleet.id }}</spotFleetRequestId>
+            <currentSpotFleetRequestState>cancelled_terminating</currentSpotFleetRequestState>
+            <previousSpotFleetRequestState>active</previousSpotFleetRequestState>
+        </item>
+        {% endfor %}
+    </successfulFleetRequestSet>
+</CancelSpotFleetRequestsResponse>"""
diff --git a/moto/ec2/utils.py b/moto/ec2/utils.py
index d9ebb4258..4d0f75254 100644
--- a/moto/ec2/utils.py
+++ b/moto/ec2/utils.py
@@ -20,6 +20,7 @@ EC2_RESOURCE_TO_PREFIX = {
     'security-group': 'sg',
     'snapshot': 'snap',
     'spot-instance-request': 'sir',
+    'spot-fleet-request': 'sfr',
     'subnet': 'subnet',
     'reservation': 'r',
     'volume': 'vol',
@@ -65,6 +66,10 @@ def random_spot_request_id():
     return random_id(prefix=EC2_RESOURCE_TO_PREFIX['spot-instance-request'])
 
 
+def random_spot_fleet_request_id():
+    return random_id(prefix=EC2_RESOURCE_TO_PREFIX['spot-fleet-request'])
+
+
 def random_subnet_id():
     return random_id(prefix=EC2_RESOURCE_TO_PREFIX['subnet'])
 
diff --git a/tests/test_cloudformation/test_cloudformation_stack_integration.py b/tests/test_cloudformation/test_cloudformation_stack_integration.py
index d3928dc48..59a179618 100644
--- a/tests/test_cloudformation/test_cloudformation_stack_integration.py
+++ b/tests/test_cloudformation/test_cloudformation_stack_integration.py
@@ -1876,3 +1876,78 @@ def test_stack_kms():
 
     result['KeyMetadata']['Enabled'].should.equal(True)
     result['KeyMetadata']['KeyUsage'].should.equal('ENCRYPT_DECRYPT')
+
+
+@mock_cloudformation()
+@mock_ec2()
+def test_stack_spot_fleet():
+    spot_fleet_template = {
+        'Resources': {
+            "SpotFleet": {
+              "Type": "AWS::EC2::SpotFleet",
+              "Properties": {
+                "SpotFleetRequestConfigData": {
+                  "IamFleetRole": "arn:aws:iam::123456789012:role/fleet",
+                  "SpotPrice": "0.12",
+                  "TargetCapacity": 6,
+                  "AllocationStrategy": "diversified",
+                  "LaunchSpecifications": [
+                  {
+                    "EbsOptimized": "false",
+                    "InstanceType": 't2.small',
+                    "ImageId": "ami-1234",
+                    "SubnetId": "subnet-123",
+                    "WeightedCapacity": "2",
+                    "SpotPrice": "0.13",
+                  },
+                  {
+                    "EbsOptimized": "true",
+                    "InstanceType": 't2.large',
+                    "ImageId": "ami-1234",
+                    "Monitoring": { "Enabled": "true" },
+                    "SecurityGroups": [{"GroupId": "sg-123"}],
+                    "SubnetId": "subnet-123",
+                    "IamInstanceProfile": {"Arn": "arn:aws:iam::123456789012:role/fleet"},
+                    "WeightedCapacity": "4",
+                    "SpotPrice": "10.00",
+                  }
+                  ]
+                }
+              }
+            }
+        }
+    }
+    spot_fleet_template_json = json.dumps(spot_fleet_template)
+
+    cf_conn = boto3.client('cloudformation', 'us-east-1')
+    stack_id = cf_conn.create_stack(
+        StackName='test_stack',
+        TemplateBody=spot_fleet_template_json,
+    )['StackId']
+
+    stack_resources = cf_conn.list_stack_resources(StackName=stack_id)
+    stack_resources['StackResourceSummaries'].should.have.length_of(1)
+    spot_fleet_id = stack_resources['StackResourceSummaries'][0]['PhysicalResourceId']
+
+    conn = boto3.client('ec2', 'us-east-1')
+    spot_fleet_requests = conn.describe_spot_fleet_requests(SpotFleetRequestIds=[spot_fleet_id])['SpotFleetRequestConfigs']
+    len(spot_fleet_requests).should.equal(1)
+    spot_fleet_request = spot_fleet_requests[0]
+    spot_fleet_request['SpotFleetRequestState'].should.equal("active")
+    spot_fleet_config = spot_fleet_request['SpotFleetRequestConfig']
+
+    spot_fleet_config['SpotPrice'].should.equal('0.12')
+    spot_fleet_config['TargetCapacity'].should.equal(6)
+    spot_fleet_config['IamFleetRole'].should.equal('arn:aws:iam::123456789012:role/fleet')
+    spot_fleet_config['AllocationStrategy'].should.equal('diversified')
+    spot_fleet_config['FulfilledCapacity'].should.equal(6.0)
+
+    len(spot_fleet_config['LaunchSpecifications']).should.equal(2)
+    launch_spec = spot_fleet_config['LaunchSpecifications'][0]
+
+    launch_spec['EbsOptimized'].should.equal(False)
+    launch_spec['ImageId'].should.equal("ami-1234")
+    launch_spec['InstanceType'].should.equal("t2.small")
+    launch_spec['SubnetId'].should.equal("subnet-123")
+    launch_spec['SpotPrice'].should.equal("0.13")
+    launch_spec['WeightedCapacity'].should.equal(2.0)
diff --git a/tests/test_ec2/test_spot_fleet.py b/tests/test_ec2/test_spot_fleet.py
new file mode 100644
index 000000000..9a52ec80b
--- /dev/null
+++ b/tests/test_ec2/test_spot_fleet.py
@@ -0,0 +1,143 @@
+from __future__ import unicode_literals
+
+import boto3
+import sure  # noqa
+
+from moto import mock_ec2
+
+SPOT_REQUEST_CONFIG = {
+    'ClientToken': 'string',
+    'SpotPrice': '0.12',
+    'TargetCapacity': 6,
+    'IamFleetRole': 'arn:aws:iam::123456789012:role/fleet',
+    'LaunchSpecifications': [{
+            'ImageId': 'ami-123',
+            'KeyName': 'my-key',
+            'SecurityGroups': [
+                {
+                    'GroupId': 'sg-123'
+                },
+            ],
+            'UserData': 'some user data',
+            'InstanceType': 't2.small',
+            'BlockDeviceMappings': [
+                {
+                    'VirtualName': 'string',
+                    'DeviceName': 'string',
+                    'Ebs': {
+                        'SnapshotId': 'string',
+                        'VolumeSize': 123,
+                        'DeleteOnTermination': True|False,
+                        'VolumeType': 'standard',
+                        'Iops': 123,
+                        'Encrypted': True|False
+                    },
+                    'NoDevice': 'string'
+                },
+            ],
+            'Monitoring': {
+                'Enabled': True
+            },
+            'SubnetId': 'subnet-1234',
+            'IamInstanceProfile': {
+                'Arn': 'arn:aws:iam::123456789012:role/fleet'
+            },
+            'EbsOptimized': False,
+            'WeightedCapacity': 2.0,
+            'SpotPrice': '0.13'
+    }, {
+            'ImageId': 'ami-123',
+            'KeyName': 'my-key',
+            'SecurityGroups': [
+                {
+                    'GroupId': 'sg-123'
+                },
+            ],
+            'UserData': 'some user data',
+            'InstanceType': 't2.large',
+            'Monitoring': {
+                'Enabled': True
+            },
+            'SubnetId': 'subnet-1234',
+            'IamInstanceProfile': {
+                'Arn': 'arn:aws:iam::123456789012:role/fleet'
+            },
+            'EbsOptimized': False,
+            'WeightedCapacity': 4.0,
+            'SpotPrice': '10.00',
+    }],
+    'AllocationStrategy': 'lowestPrice',
+    'FulfilledCapacity': 6,
+}
+
+
+@mock_ec2
+def test_create_spot_fleet_with_lowest_price():
+    conn = boto3.client("ec2", region_name='us-west-2')
+
+    spot_fleet_res = conn.request_spot_fleet(
+        SpotFleetRequestConfig=SPOT_REQUEST_CONFIG
+    )
+    spot_fleet_id = spot_fleet_res['SpotFleetRequestId']
+
+    spot_fleet_requests = conn.describe_spot_fleet_requests(SpotFleetRequestIds=[spot_fleet_id])['SpotFleetRequestConfigs']
+    len(spot_fleet_requests).should.equal(1)
+    spot_fleet_request = spot_fleet_requests[0]
+    spot_fleet_request['SpotFleetRequestState'].should.equal("active")
+    spot_fleet_config = spot_fleet_request['SpotFleetRequestConfig']
+
+    spot_fleet_config['SpotPrice'].should.equal('0.12')
+    spot_fleet_config['TargetCapacity'].should.equal(6)
+    spot_fleet_config['IamFleetRole'].should.equal('arn:aws:iam::123456789012:role/fleet')
+    spot_fleet_config['AllocationStrategy'].should.equal('lowestPrice')
+    spot_fleet_config['FulfilledCapacity'].should.equal(6.0)
+
+    len(spot_fleet_config['LaunchSpecifications']).should.equal(2)
+    launch_spec = spot_fleet_config['LaunchSpecifications'][0]
+
+    launch_spec['EbsOptimized'].should.equal(False)
+    launch_spec['SecurityGroups'].should.equal([{"GroupId": "sg-123"}])
+    launch_spec['IamInstanceProfile'].should.equal({"Arn": "arn:aws:iam::123456789012:role/fleet"})
+    launch_spec['ImageId'].should.equal("ami-123")
+    launch_spec['InstanceType'].should.equal("t2.small")
+    launch_spec['KeyName'].should.equal("my-key")
+    launch_spec['Monitoring'].should.equal({"Enabled": True})
+    launch_spec['SpotPrice'].should.equal("0.13")
+    launch_spec['SubnetId'].should.equal("subnet-1234")
+    launch_spec['UserData'].should.equal("some user data")
+    launch_spec['WeightedCapacity'].should.equal(2.0)
+
+    instance_res = conn.describe_spot_fleet_instances(SpotFleetRequestId=spot_fleet_id)
+    instances = instance_res['ActiveInstances']
+    len(instances).should.equal(3)
+
+
+@mock_ec2
+def test_create_diversified_spot_fleet():
+    conn = boto3.client("ec2", region_name='us-west-2')
+    diversified_config = SPOT_REQUEST_CONFIG.copy()
+    diversified_config['AllocationStrategy'] = 'diversified'
+
+    spot_fleet_res = conn.request_spot_fleet(
+        SpotFleetRequestConfig=diversified_config
+    )
+    spot_fleet_id = spot_fleet_res['SpotFleetRequestId']
+
+    instance_res = conn.describe_spot_fleet_instances(SpotFleetRequestId=spot_fleet_id)
+    instances = instance_res['ActiveInstances']
+    len(instances).should.equal(2)
+
+
+@mock_ec2
+def test_cancel_spot_fleet_request():
+    conn = boto3.client("ec2", region_name='us-west-2')
+
+    spot_fleet_res = conn.request_spot_fleet(
+        SpotFleetRequestConfig=SPOT_REQUEST_CONFIG,
+    )
+    spot_fleet_id = spot_fleet_res['SpotFleetRequestId']
+
+    conn.cancel_spot_fleet_requests(SpotFleetRequestIds=[spot_fleet_id], TerminateInstances=True)
+
+    spot_fleet_requests = conn.describe_spot_fleet_requests(SpotFleetRequestIds=[spot_fleet_id])['SpotFleetRequestConfigs']
+    len(spot_fleet_requests).should.equal(0)