Add policyExtension tests

Signed-off-by: jackschofield23 <jack.schofield@answerdigital.com>

Author: jackschofield23

src/Storage/Test/Extensions/PolicyExtensionsTest.cs

@@ -1,8 +1,10 @@
 // SPDX-FileCopyrightText: © 2021-2022 MONAI Consortium
 // SPDX-License-Identifier: Apache License 2.0
 
+using System;
 using System.Collections.Generic;
 using Monai.Deploy.Storage.Common.Extensions;
+using Newtonsoft.Json;
 using Xunit;
 
 namespace Monai.Deploy.Storage.Test.Extensions
@@ -57,6 +59,38 @@ public void GetPathList_SingleLevelPathReturnsValidList()
             Assert.Equal(expectedList, actualList);
         }
 
+        [Fact]
+        public void GetPathList_NullFolder_ThrowsException()
+        {
+            Assert.Throws<ArgumentNullException>(() => PolicyExtensions.GetPathList(null));
+        }
+
+        #endregion
+
+        #region ToPolicy
+
+        [Fact]
+        public void ToPolicy_ValidBucketAndFolder()
+        {
+            var policy = PolicyExtensions.ToPolicy("test-bucket", "Jack/Is/The/Best");
+
+            var policyString = JsonConvert.SerializeObject(policy, Formatting.None, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore });
+
+            Assert.Equal("{\"Version\":\"2012-10-17\",\"Statement\":[{\"Sid\":\"AllowUserToSeeBucketListInTheConsole\",\"Action\":[\"s3:ListAllMyBuckets\",\"s3:GetBucketLocation\"],\"Effect\":\"Allow\",\"Resource\":[\"arn:aws:s3:::*\"]},{\"Sid\":\"AllowRootAndHomeListingOfBucket\",\"Action\":[\"s3:ListBucket\"],\"Effect\":\"Allow\",\"Resource\":[\"arn:aws:s3:::test-bucket\"],\"Condition\":{\"StringEquals\":{\"s3:prefix\":[\"Jack/Is/The/Best\",\"Jack/Is/The/\",\"Jack/Is/\",\"Jack/\",\"\"],\"s3:delimiter\":[\"/\"]}}},{\"Sid\":\"AllowListingOfUserFolder\",\"Action\":[\"s3:ListBucket\"],\"Effect\":\"Allow\",\"Resource\":[\"arn:aws:s3:::test-bucket\"],\"Condition\":{\"StringEquals\":{\"s3:prefix\":[\"Jack/Is/The/Best/*\"]}}},{\"Sid\":\"AllowAllS3ActionsInUserFolder\",\"Action\":[\"s3:*\"],\"Effect\":\"Allow\",\"Resource\":[\"arn:aws:s3:::test-bucket/Jack/Is/The/Best/*\"]}]}", policyString);
+        }
+
+        [Fact]
+        public void ToPolicy_NullBucket_ThrowsException()
+        {
+            Assert.Throws<ArgumentNullException>(() => PolicyExtensions.ToPolicy(null, "Jack/Is/The/Best"));
+        }
+
+        [Fact]
+        public void ToPolicy_NullFolder_ThrowsException()
+        {
+            Assert.Throws<ArgumentNullException>(() => PolicyExtensions.ToPolicy("test-bucket", null));
+        }
+
         #endregion
     }
 }