Add unit test for multiple IsGrantedAsync.

framework/src/Volo.Abp.Authorization/Volo/Abp/Authorization/Permissions/IPermissionChecker.cs

@@ -1,5 +1,4 @@
-using System.Collections.Generic;
-using System.Security.Claims;
+using System.Security.Claims;
 using System.Threading.Tasks;
 using JetBrains.Annotations;
 

modules/permission-management/src/Volo.Abp.PermissionManagement.Domain/Volo/Abp/PermissionManagement/PermissionStore.cs

@@ -119,7 +119,7 @@ namespace Volo.Abp.PermissionManagement
             foreach (var item in cacheItems)
             {
                 result.Result.Add(PermissionGrantCacheItem.GetPermissionNameFormCacheKeyOrNull(item.Key),
-                    item.Value.IsGranted
+                    item.Value != null && item.Value.IsGranted
                         ? PermissionGrantResult.Granted
                         : PermissionGrantResult.Undefined);
             }

modules/permission-management/test/Volo.Abp.PermissionManagement.Domain.Tests/Volo/Abp/PermissionManagement/PermissionGrantCacheItem_Tests.cs

@@ -0,0 +1,16 @@
+using Shouldly;
+using Xunit;
+
+namespace Volo.Abp.PermissionManagement
+{
+    public class PermissionGrantCacheItem_Tests
+    {
+        [Fact]
+        public void GetPermissionNameFormCacheKeyOrNull()
+        {
+            var key = PermissionGrantCacheItem.CalculateCacheKey("aaa", "bbb", "ccc");
+            PermissionGrantCacheItem.GetPermissionNameFormCacheKeyOrNull(key).ShouldBe("aaa");
+            PermissionGrantCacheItem.GetPermissionNameFormCacheKeyOrNull("aaabbbccc").ShouldBeNull();
+        }
+    }
+}

modules/permission-management/test/Volo.Abp.PermissionManagement.Domain.Tests/Volo/Abp/PermissionManagement/PermissionStore_Tests.cs

@@ -1,6 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
+using System.Linq;
 using System.Threading.Tasks;
 using Shouldly;
 using Volo.Abp.Authorization.Permissions;
@@ -28,7 +26,19 @@ namespace Volo.Abp.PermissionManagement
             (await _permissionStore.IsGrantedAsync("MyPermission1NotExist",
                 UserPermissionValueProvider.ProviderName,
                 PermissionTestDataBuilder.User1Id.ToString())).ShouldBeFalse();
+        }
+
+        [Fact]
+        public async Task IsGranted_Multiple()
+        {
+            var result = await _permissionStore.IsGrantedAsync(new[] {"MyPermission1", "MyPermission1NotExist"},
+                UserPermissionValueProvider.ProviderName,
+                PermissionTestDataBuilder.User1Id.ToString());
+
+            result.Result.Count.ShouldBe(2);
 
+            result.Result.FirstOrDefault(x => x.Key == "MyPermission1").Value.ShouldBe(PermissionGrantResult.Granted);
+            result.Result.FirstOrDefault(x => x.Key == "MyPermission1NotExist").Value.ShouldBe(PermissionGrantResult.Undefined);
         }
     }
 }