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diff --git a/ice_validator/app_tests/preload_tests/test_environment.py b/ice_validator/app_tests/preload_tests/test_environment.py
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+++ b/ice_validator/app_tests/preload_tests/test_environment.py
@@ -0,0 +1,180 @@
+# -*- coding: utf8 -*-
+# ============LICENSE_START====================================================
+# org.onap.vvp/validation-scripts
+# ===================================================================
+# Copyright © 2019 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============================================
+from pathlib import Path
+
+import pytest
+
+from preload.environment import CloudServiceArchive, PreloadEnvironment
+
+THIS_DIR = Path(__file__).parent
+PRELOAD_ENV_DIR = THIS_DIR / "preload_envs"
+
+
+@pytest.fixture(scope="session")
+def csar():
+    return CloudServiceArchive(PRELOAD_ENV_DIR / "test.csar")
+
+
+@pytest.fixture(scope="session")
+def env():
+    return PreloadEnvironment(PRELOAD_ENV_DIR)
+
+
+def test_csar_service_name(csar):
+    assert csar.service_name == "stark_vccf_svc"
+
+
+def test_csar_str_and_repr(csar):
+    assert str(csar) == "CSAR (path=test.csar, name=stark_vccf_svc)"
+    assert repr(csar) == "CSAR (path=test.csar, name=stark_vccf_svc)"
+
+
+def test_csar_vf_module_model_name(csar):
+    assert (
+        csar.get_vf_module_model_name("base_vIECCF")
+        == "StarkVccfVf..base_vIECCF..module-0"
+    )
+
+
+def test_csar_get_vf_module_resource_name(csar):
+    assert csar.get_vf_module_resource_name("base_vIECCF") == "stark_vccf_vf"
+
+
+def test_csar_get_vf_module_resource_name_not_found(csar):
+    assert csar.get_vf_module_resource_name("unknown") is None
+
+
+def test_preload_environment_global_csar(env):
+    assert env.csar.service_name == "stark_vccf_svc"
+
+
+def test_preload_environment_nest_env_csar_inherit(env):
+    env_two = env.get_environment("env_two")
+    assert env_two.csar.service_name == "stark_vccf_svc"
+
+
+def test_preload_environment_nest_env_csar_override(env):
+    sub_env = env.get_environment("env_three")
+    assert sub_env.csar.service_name == "StarkMultiModule2_43550"
+
+
+def test_preload_environment_environments(env):
+    names = {e.name for e in env.environments}
+    assert names == {"env_two", "env_three", "env_one_a"}
+
+
+def test_preload_environment_environments_nested(env):
+    env_one = env.get_environment("env_one")
+    names = {e.name for e in env_one.environments}
+    assert names == {"env_one_a"}
+
+
+def test_preload_environment_get_module_global_base(env):
+    module = env.get_module("base")
+    assert module["my_ip"] == "default"
+
+
+def test_preload_environment_get_module_global_not_found(env):
+    module = env.get_module("unknown")
+    assert module == {}
+
+
+def test_preload_environment_get_module_sub_env(env):
+    env_two = env.get_environment("env_two")
+    module = env_two.get_module("base")
+    assert module["my_ip"] == "192.168.0.2"
+    assert module["common"] == "ABC"
+
+
+def test_preload_environment_module_names(env):
+    expected = {"base.env", "incremental.env"}
+    assert env.module_names == expected
+    # check a nested env with inherits all modules
+    assert env.get_environment("env_three").module_names == expected
+
+
+def test_preload_environment_modules(env):
+    modules = env.modules
+    assert isinstance(modules, dict)
+    assert modules.keys() == {"base.env", "incremental.env"}
+    assert all(isinstance(val, dict) for val in modules.values())
+
+
+def test_preload_environment_is_base(env):
+    assert env.is_base
+    assert not env.get_environment("env_one").is_base
+
+
+def test_preload_environment_is_leaf(env):
+    assert not env.is_leaf
+    assert env.get_environment("env_two").is_leaf
+    assert not env.get_environment("env_one").is_leaf
+    assert env.get_environment("env_one_a").is_leaf
+
+
+def test_preload_environment_str_repr(env):
+    assert str(env) == "PreloadEnvironment(name=preload_envs)"
+    assert repr(env) == "PreloadEnvironment(name=preload_envs)"
+
+
+def test_preload_environment_defaults(env):
+    expected = {"availability_zone_0": "az0"}
+    assert env.defaults == expected
+    assert env.get_environment("env_one_a").defaults == expected
+
+
+def test_preload_environment_defaults_merging_and_override(env):
+    assert env.get_environment("env_three").defaults == {
+        "availability_zone_0": "az0-b",
+        "custom_env_3": "default",
+    }
+
+
+def test_preload_environment_defaults_in_module_env(env):
+    mod = env.get_environment("env_three").get_module("base")
+    assert mod == {
+        "availability_zone_0": "az0-b",
+        "common": "ABC",
+        "custom_env_3": "default",
+        "my_ip": "default",
+    }
+    mod = env.get_environment("env_one").get_module("base")
+    assert mod == {
+        "availability_zone_0": "az0",
+        "common": "ABC",
+        "my_ip": "192.168.0.1",
+    }