diff --git a/backend/tests/Designer.Tests/Controllers/PreviewController/ApplicationMetadataTests.cs b/backend/tests/Designer.Tests/Controllers/PreviewController/ApplicationMetadataTests.cs
index c44e62db89f..3671a2b4747 100644
--- a/backend/tests/Designer.Tests/Controllers/PreviewController/ApplicationMetadataTests.cs
+++ b/backend/tests/Designer.Tests/Controllers/PreviewController/ApplicationMetadataTests.cs
@@ -51,9 +51,9 @@ public async Task Get_ApplicationMetadata_Ok()
             Assert.Equal(HttpStatusCode.OK, response.StatusCode);
 
             string responseBody = await response.Content.ReadAsStringAsync();
-            ApplicationMetadata expectedApplicationMetadata = JsonSerializer.Deserialize<ApplicationMetadata>(expectedApplicationMetadataString, SerializerOptions);
+            ApplicationMetadata expectedApplicationMetadata = JsonSerializer.Deserialize<ApplicationMetadata>(expectedApplicationMetadataString, JsonSerializerOptions);
             expectedApplicationMetadata.AltinnNugetVersion = string.Empty;
-            string expectedJson = JsonSerializer.Serialize(expectedApplicationMetadata, SerializerOptions);
+            string expectedJson = JsonSerializer.Serialize(expectedApplicationMetadata, JsonSerializerOptions);
             JsonUtils.DeepEquals(expectedJson, responseBody).Should().BeTrue();
         }
 
@@ -72,9 +72,9 @@ public async Task Get_ApplicationMetadata_With_V8_Altinn_Nuget_Version_Ok()
             Assert.Equal(HttpStatusCode.OK, response.StatusCode);
 
             string responseBody = await response.Content.ReadAsStringAsync();
-            ApplicationMetadata expectedApplicationMetadata = JsonSerializer.Deserialize<ApplicationMetadata>(expectedApplicationMetadataString, SerializerOptions);
+            ApplicationMetadata expectedApplicationMetadata = JsonSerializer.Deserialize<ApplicationMetadata>(expectedApplicationMetadataString, JsonSerializerOptions);
             expectedApplicationMetadata.AltinnNugetVersion = "8.0.0.0";
-            string expectedJson = JsonSerializer.Serialize(expectedApplicationMetadata, SerializerOptions);
+            string expectedJson = JsonSerializer.Serialize(expectedApplicationMetadata, JsonSerializerOptions);
             JsonUtils.DeepEquals(expectedJson, responseBody).Should().BeTrue();
         }
 
@@ -93,7 +93,7 @@ public async Task Get_ApplicationMetadata_WithLessDataTypesThanLayoutSetsFile_Ok
             Assert.Equal(HttpStatusCode.OK, response.StatusCode);
 
             string responseBody = await response.Content.ReadAsStringAsync();
-            ApplicationMetadata expectedApplicationMetadata = JsonSerializer.Deserialize<ApplicationMetadata>(expectedApplicationMetadataString, SerializerOptions);
+            ApplicationMetadata expectedApplicationMetadata = JsonSerializer.Deserialize<ApplicationMetadata>(expectedApplicationMetadataString, JsonSerializerOptions);
             expectedApplicationMetadata.AltinnNugetVersion = "8.0.0.0";
             // Add the mocked data type to expected app metadata
             expectedApplicationMetadata.DataTypes.Add(new DataType()
@@ -110,7 +110,7 @@ public async Task Get_ApplicationMetadata_WithLessDataTypesThanLayoutSetsFile_Ok
             expectedApplicationMetadata.PartyTypesAllowed.SubUnit = false;
             expectedApplicationMetadata.PartyTypesAllowed.BankruptcyEstate = false;
 
-            string expectedJson = JsonSerializer.Serialize(expectedApplicationMetadata, SerializerOptions);
+            string expectedJson = JsonSerializer.Serialize(expectedApplicationMetadata, JsonSerializerOptions);
             JsonUtils.DeepEquals(expectedJson, responseBody).Should().BeTrue();
         }
 
@@ -118,7 +118,7 @@ public async Task Get_ApplicationMetadata_WithLessDataTypesThanLayoutSetsFile_Ok
         public async Task Get_ApplicationMetadata_WithAllPartyTypesAllowedSetToFalse()
         {
             string originalApplicationMetadataString = TestDataHelper.GetFileFromRepo(Org, AppV4, Developer, "App/config/applicationmetadata.json");
-            ApplicationMetadata originalApplicationMetadata = JsonSerializer.Deserialize<ApplicationMetadata>(originalApplicationMetadataString, SerializerOptions);
+            ApplicationMetadata originalApplicationMetadata = JsonSerializer.Deserialize<ApplicationMetadata>(originalApplicationMetadataString, JsonSerializerOptions);
             originalApplicationMetadata.PartyTypesAllowed.Person.Should().BeTrue();
             originalApplicationMetadata.PartyTypesAllowed.Organisation.Should().BeTrue();
             originalApplicationMetadata.PartyTypesAllowed.SubUnit.Should().BeTrue();
@@ -137,7 +137,7 @@ public async Task Get_ApplicationMetadata_WithAllPartyTypesAllowedSetToFalse()
 
             string responseBody = await response.Content.ReadAsStringAsync();
 
-            ApplicationMetadata responseApplicationMetadata = JsonSerializer.Deserialize<ApplicationMetadata>(responseBody, SerializerOptions);
+            ApplicationMetadata responseApplicationMetadata = JsonSerializer.Deserialize<ApplicationMetadata>(responseBody, JsonSerializerOptions);
             responseApplicationMetadata.PartyTypesAllowed.Person.Should().BeFalse();
             responseApplicationMetadata.PartyTypesAllowed.Organisation.Should().BeFalse();
             responseApplicationMetadata.PartyTypesAllowed.SubUnit.Should().BeFalse();
diff --git a/backend/tests/Designer.Tests/Controllers/PreviewController/PreviewControllerTestsBase.cs b/backend/tests/Designer.Tests/Controllers/PreviewController/PreviewControllerTestsBase.cs
index de8910dd32c..62f2d3f2341 100644
--- a/backend/tests/Designer.Tests/Controllers/PreviewController/PreviewControllerTestsBase.cs
+++ b/backend/tests/Designer.Tests/Controllers/PreviewController/PreviewControllerTestsBase.cs
@@ -1,8 +1,11 @@
-using System.Text.Encodings.Web;
+using System.Linq;
+using System.Text.Encodings.Web;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 using Designer.Tests.Controllers.ApiTests;
 using Microsoft.AspNetCore.Mvc.Testing;
+using Microsoft.Extensions.Caching.Distributed;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace Designer.Tests.Controllers.PreviewController
 {
@@ -22,12 +25,19 @@ public class PreviewControllerTestsBase<TTestClass> : DesignerEndpointsTestsBase
         protected const string InstanceGuId = "f1e23d45-6789-1bcd-8c34-56789abcdef0";
         protected const string AttachmentGuId = "f47ac10b-58cc-4372-a567-0e02b2c3d479";
         protected const string MockedReferrerUrl = "https://studio-mock-url.no";
-        protected readonly JsonSerializerOptions SerializerOptions = new JsonSerializerOptions()
+
+        protected override void ConfigureTestServices(IServiceCollection services)
         {
-            PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
-            Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
-            DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
-        };
+            base.ConfigureTestServices(services);
+            var cacheServices =  services.Where(
+                d => d.ServiceType == typeof(IDistributedCache)).ToList();
+            foreach (ServiceDescriptor serviceDescriptor in cacheServices)
+            {
+                services.Remove(serviceDescriptor);
+            }
+
+            services.AddDistributedMemoryCache();
+        }
 
         public PreviewControllerTestsBase(WebApplicationFactory<Program> factory) : base(factory)
         {