Implementing delete-group endpoint and appropriate test case

moto/iam/models.py

@@ -1221,6 +1221,12 @@ class IAMBackend(BaseBackend):
         group = self.get_group(group_name)
         return group.get_policy(policy_name)
 
+    def delete_group(self, group_name):
+        try:
+            del self.groups[group_name]
+        except KeyError:
+            raise IAMNotFoundException("Group {0} not found".format(group_name))
+
     def create_user(self, user_name, path="/"):
         if user_name in self.users:
             raise IAMConflictException(

moto/iam/responses.py

@@ -428,6 +428,12 @@ class IamResponse(BaseResponse):
         template = self.response_template(GET_GROUP_POLICY_TEMPLATE)
         return template.render(name="GetGroupPolicyResponse", **policy_result)
 
+    def delete_group(self):
+        group_name = self._get_param('GroupName')
+        iam_backend.delete_group(group_name)
+        template = self.response_template(GENERIC_EMPTY_TEMPLATE)
+        return template.render(name='DeleteGroup')
+
     def create_user(self):
         user_name = self._get_param("UserName")
         path = self._get_param("Path")

tests/test_iam/test_iam_groups.py

@@ -182,3 +182,14 @@ def test_list_group_policies():
     conn.list_group_policies(GroupName="my-group")["PolicyNames"].should.equal(
         ["my-policy"]
     )
+
+
+@mock_iam
+def test_delete_group():
+    conn = boto3.client('iam', region_name='us-east-1')
+    conn.create_group(GroupName='my-group')
+    groups = conn.list_groups()
+    assert groups['Groups'][0]['GroupName'] == 'my-group'
+    assert len(groups['Groups']) == 1
+    conn.delete_group(GroupName='my-group')
+    conn.list_groups()['Groups'].should.be.empty