port deployment template unit test from track1 (#10169)

sdk/resources/mgmt/src/test/java/com/azure/management/resources/implementation/TypeSerializationTests.java

@@ -0,0 +1,38 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+package com.azure.management.resources.implementation;
+
+import com.azure.core.management.serializer.AzureJacksonAdapter;
+import com.azure.core.util.serializer.SerializerEncoding;
+import com.azure.management.resources.DeploymentProperties;
+import com.azure.management.resources.models.DeploymentExtendedInner;
+import com.azure.management.resources.models.DeploymentInner;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class TypeSerializationTests {
+
+    @Test
+    public void testDeploymentSerialization() throws Exception {
+        final String templateJson = "{ \"/subscriptions/<redacted>/resourceGroups/<redacted>/providers/Microsoft.ManagedIdentity/userAssignedIdentities/<redacted>\": {} }";
+
+        DeploymentImpl deployment = new DeploymentImpl(new DeploymentExtendedInner(), "", null);
+        deployment.withTemplate(templateJson);
+
+        AzureJacksonAdapter serializerAdapter = new AzureJacksonAdapter();
+        String deploymentJson = serializerAdapter.serialize(createRequestFromInner(deployment), SerializerEncoding.JSON);
+        Assertions.assertTrue(deploymentJson.contains("Microsoft.ManagedIdentity"));
+    }
+
+    private static DeploymentInner createRequestFromInner(DeploymentImpl deployment) {
+        DeploymentInner inner = new DeploymentInner()
+                .withProperties(new DeploymentProperties());
+        inner.properties().withMode(deployment.mode());
+        inner.properties().withTemplate(deployment.template());
+        inner.properties().withTemplateLink(deployment.templateLink());
+        inner.properties().withParameters(deployment.parameters());
+        inner.properties().withParametersLink(deployment.parametersLink());
+        return inner;
+    }
+}