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diff --git a/cps-rest/src/test/groovy/org/onap/cps/rest/utils/ZipFileSizeValidatorSpec.groovy b/cps-rest/src/test/groovy/org/onap/cps/rest/utils/ZipFileSizeValidatorSpec.groovy
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+++ b/cps-rest/src/test/groovy/org/onap/cps/rest/utils/ZipFileSizeValidatorSpec.groovy
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+/*
+ *  ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Bell Canada.
+ *  ================================================================================
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file 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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.rest.utils
+
+import org.onap.cps.spi.exceptions.ModelValidationException
+import spock.lang.Specification
+
+class ZipFileSizeValidatorSpec extends Specification {
+
+    def static thresholdSize = ZipFileSizeValidator.THRESHOLD_SIZE
+    def static thresholdEntries = ZipFileSizeValidator.THRESHOLD_ENTRIES
+    def static thresholdRatio = ZipFileSizeValidator.THRESHOLD_RATIO
+
+    def objectUnderTest = new ZipFileSizeValidator()
+    def compressedFileSize = 100
+
+    def setup() {
+        objectUnderTest.setTotalEntryInArchive(0)
+        objectUnderTest.setTotalSizeArchive(0)
+        objectUnderTest.setCompressedSize(compressedFileSize)
+    }
+
+    def 'Increment the total entries in Archive.'() {
+        when: 'the totalEntriesInArchive value is incremented'
+            objectUnderTest.incrementTotalEntryInArchive()
+        then: 'the totalEntriesInArchive is incremented by 1'
+            assert objectUnderTest.totalEntryInArchive == old(objectUnderTest.totalEntryInArchive) + 1
+    }
+
+    def 'Update the total size of Archive.'() {
+        given: 'the size of an entry of archive'
+            def entrySize = 100
+        when: 'the totalSizeArchive is to be updated with the latest entry Size'
+            objectUnderTest.updateTotalSizeArchive(entrySize)
+        then: 'the totalSizeArchive is updated as expected'
+            assert objectUnderTest.totalSizeArchive == old(objectUnderTest.totalSizeArchive) + entrySize
+    }
+
+    def 'Validate the zip archive for compression ratio less that threshold compression ratio.'() {
+        given: 'the totalEntrySize of the archive so that compression ratio is within the threshold'
+            int totalEntrySize = compressedFileSize * thresholdRatio - 1
+        when: 'the validation is performed against the threshold compression ratio'
+            objectUnderTest.validateCompresssionRatio(totalEntrySize)
+        then: 'validation passes and no exception is thrown'
+            noExceptionThrown()
+    }
+
+    def 'Validate the zip archive for compression ratio.'() {
+        given: 'the totalEntrySize of the archive so that compression ratio is higher than the threshold'
+            int totalEntrySize = compressedFileSize * thresholdRatio + 1
+        when: 'the validation is performed against the threshold compression ratio'
+            objectUnderTest.validateCompresssionRatio(totalEntrySize)
+        then: 'validation fails and exception is thrown'
+            thrown ModelValidationException
+    }
+
+    def 'Validate the zip archive for thresholdSize and thresholdEntries #caseDescriptor.'() {
+        given:
+            objectUnderTest.setTotalEntryInArchive(totalEntriesInArchive)
+            objectUnderTest.setTotalSizeArchive(totalSizeArchive)
+        when: 'the validation is performed against the threshold size and threshold Entries count'
+            objectUnderTest.validateSizeAndEntries()
+        then: 'validation passes and no exception is thrown'
+            noExceptionThrown()
+        where: 'following cases are tested'
+            caseDescriptor              | totalSizeArchive  | totalEntriesInArchive
+            'less than threshold value' | thresholdSize - 1 | thresholdEntries - 1
+            'at threshold value'        | thresholdSize     | thresholdEntries
+    }
+
+    def 'Validate the zip archive for thresholdSize and thresholdEntries with #caseDescriptor.'() {
+        given:
+            objectUnderTest.setTotalEntryInArchive(totalEntriesInArchive)
+            objectUnderTest.setTotalSizeArchive(totalSizeArchive)
+        when: 'the validation is performed against the threshold size and threshold Entries count'
+            objectUnderTest.validateSizeAndEntries()
+        then: 'validation fails and exception is thrown'
+            thrown ModelValidationException
+        where: 'following cases are tested'
+            caseDescriptor                                  | totalSizeArchive  | totalEntriesInArchive
+            'totalEntriesInArchive exceeds threshold value' | thresholdSize     | thresholdEntries + 1
+            'totalSizeArchive exceeds threshold value'      | thresholdSize + 1 | thresholdEntries
+    }
+}