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diff --git a/ice_validator/tests/test_nesting_nova_server.py b/ice_validator/tests/test_nesting_nova_server.py
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+# -*- coding: utf8 -*-
+# ============LICENSE_START====================================================
+# org.onap.vvp/validation-scripts
+# ===================================================================
+# Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+# ===================================================================
+#
+# Unless otherwise specified, all software contained herein is licensed
+# under the Apache License, Version 2.0 (the "License");
+# you may not use this software except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#             http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+#
+#
+# Unless otherwise specified, all documentation contained herein is licensed
+# under the Creative Commons License, Attribution 4.0 Intl. (the "License");
+# you may not use this documentation except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#             https://creativecommons.org/licenses/by/4.0/
+#
+# Unless required by applicable law or agreed to in writing, documentation
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# ============LICENSE_END============================================
+#
+# ECOMP is a trademark and service mark of AT&T Intellectual Property.
+#
+
+"""
+test nesting level
+0 -> 1 -> 2 -> too many levels.
+"""
+
+import pytest
+
+from .utils import nested_files
+from .helpers import validates
+
+VERSION = "1.0.0"
+
+
+def get_nova_server_count(heat):
+    """return the number of OS::Nova::Server
+    resources in heat
+    """
+    return len(heat.get_resource_by_type("OS::Nova::Server"))
+
+
+# pylint: disable=invalid-name
+
+
+@validates("R-17528")
+def test_nesting_nova_server(yaml_files):
+    """
+    A VNF's Heat Orchestration Template's first level Nested YAML file
+    **MUST NOT** contain more than one ``OS::Nova::Server`` resource.
+    A VNF's Heat Orchestration Template's second level Nested YAML file
+    **MUST NOT** contain an ``OS::Nova::Server`` resource.
+
+    level: 0    1         2         3
+    template -> nested -> nested -> too many levels
+    """
+    bad, __, heat, depths = nested_files.get_nesting(yaml_files)
+    if bad:
+        pytest.skip("nesting depth exceeded")
+    for parent, depth in depths.items():
+        for depth_tuple in depth:
+            depth, context = depth_tuple
+            if depth > 1:
+                fname = context[0]
+                nservers = get_nova_server_count(heat[fname])
+                if nservers > 1:
+                    bad.append(
+                        "nested template %s must have only have 1 "
+                        "OS::Nova::Server defined, but %s were found"
+                        % (fname, nservers)
+                    )
+            if depth > 2:
+                fname = context[1]
+                nservers = get_nova_server_count(heat[fname])
+                if nservers > 0:
+                    bad.append(
+                        "nested template %s must not have an "
+                        "OS::Nova::Server defined, but %s were found"
+                        % (fname, nservers)
+                    )
+    assert not bad, "; ".join(bad)