Added BatchAccountIdentity constructor and test for equality against old type.

Author: paterasMSFT

sdk/batch/Microsoft.Azure.Management.Batch/src/Models/BatchAccountIdentity.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Microsoft.Azure.Management.Batch.Models
+{
+    public partial class BatchAccountIdentity
+    {
+        public BatchAccountIdentity(ResourceIdentityType type, string principalId = default(string), string tenantId = default(string), IDictionary<string, BatchAccountIdentityUserAssignedIdentitiesValue> userAssignedIdentities = default(IDictionary<string, BatchAccountIdentityUserAssignedIdentitiesValue>))
+        : this(type, principalId, tenantId, userAssignedIdentities as IDictionary<string, UserAssignedIdentities>)
+        {
+        }
+    }
+}

sdk/batch/Microsoft.Azure.Management.Batch/tests/InMemoryTests/AccountTests.InMemory.cs

@@ -6,6 +6,7 @@
 using Microsoft.Azure.Management.Batch.Models;
 using Microsoft.Rest;
 using Microsoft.Rest.Azure;
+using Microsoft.Rest.ClientRuntime.Azure.TestFramework;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -902,5 +903,18 @@ public void ListOutboundNetworkDependenciesEndpointsValidateResponse()
             Assert.Equal("AutoStorage endpoint for this Batch account. Applicable to all Azure Batch pools under this account.", endpoint.Endpoints[0].Description);
             Assert.Equal(443, endpoint.Endpoints[0].EndpointDetails[0].Port);
         }
+
+        [Fact]
+        public void UserAssignedIdentitiesShouldSubstituteForBatchAccountIdentityUserAssignedIdentitiesValue()
+        {
+            string principalId = "TestPrincipal";
+            string tenantId = "TestTenant";
+            BatchAccountIdentityUserAssignedIdentitiesValue testIdentity = new BatchAccountIdentityUserAssignedIdentitiesValue();
+            BatchAccountIdentity identity = new BatchAccountIdentity(ResourceIdentityType.UserAssigned, principalId, tenantId, new Dictionary<string, BatchAccountIdentityUserAssignedIdentitiesValue> { { "", testIdentity } });
+
+            Assert.True(testIdentity is UserAssignedIdentities);
+            Assert.Equal(principalId, identity.PrincipalId);
+            Assert.Equal(tenantId, identity.TenantId);
+        }
     }
 }