Added get network test

moto/managedblockchain/exceptions.py

@@ -14,3 +14,14 @@ class BadRequestException(ManagedBlockchainClientError):
                 pretty_called_method, operation_error
             ),
         )
+
+
+class ResourceNotFoundException(ManagedBlockchainClientError):
+    def __init__(self, pretty_called_method, operation_error):
+        self.code = 404
+        super(ResourceNotFoundException, self).__init__(
+            "ResourceNotFoundException",
+            "An error occurred (BadRequestException) when calling the {0} operation: {1}".format(
+                pretty_called_method, operation_error
+            ),
+        )

moto/managedblockchain/models.py

@@ -6,7 +6,7 @@ from boto3 import Session
 
 from moto.core import BaseBackend, BaseModel
 
-from .exceptions import BadRequestException
+from .exceptions import BadRequestException, ResourceNotFoundException
 
 from .utils import get_network_id, get_member_id
 
@@ -164,6 +164,10 @@ class ManagedBlockchainBackend(BaseBackend):
         return self.networks.values()
 
     def get_network(self, network_id):
+        if network_id not in self.networks:
+            raise ResourceNotFoundException(
+                "CreateNetwork", "Network {0} not found".format(network_id)
+            )
         return self.networks.get(network_id)
 
 

tests/test_managedblockchain/test_managedblockchain_networks.py

@@ -131,3 +131,12 @@ def test_create_network_badedition():
         VotingPolicy=default_votingpolicy,
         MemberConfiguration=default_memberconfiguration,
     ).should.throw(Exception, "Invalid request body")
+
+
+@mock_managedblockchain
+def test_get_network_badnetwork():
+    conn = boto3.client("managedblockchain", region_name="us-east-1")
+
+    response = conn.get_network.when.called_with(
+        NetworkId="n-BADNETWORK",
+    ).should.throw(Exception, "Network n-BADNETWORK not found")