Validator fix for assets and references.

backend/extensions/Squidex.Extensions/Validation/CompositeUniqueValidatorFactory.cs

@@ -25,7 +25,7 @@ namespace Squidex.Extensions.Validation
             this.contentRepository = contentRepository;
         }
 
-        public IEnumerable<IValidator> CreateContentValidators(ValidatorContext context, FieldValidatorFactory createFieldValidator)
+        public IEnumerable<IValidator> CreateContentValidators(ValidatorContext context, ValidatorFactory createFieldValidator)
         {
             foreach (var validatorTag in ValidatorTags(context.Schema.Properties.Tags))
             {

backend/src/Squidex.Domain.Apps.Core.Operations/ValidateContent/ContentValidator.cs

@@ -118,7 +118,12 @@ namespace Squidex.Domain.Apps.Core.ValidateContent
 
         private IValidator CreateFieldValidator(IField field)
         {
-            return new FieldValidator(CreateValueValidators(field), field);
+            return new FieldValidator(CreateValueValidator(field), field);
+        }
+
+        private IValidator CreateValueValidator(IField field)
+        {
+            return new AggregateValidator(CreateValueValidators(field), log);
         }
 
         private IEnumerable<IValidator> CreateContentValidators()

backend/src/Squidex.Domain.Apps.Core.Operations/ValidateContent/DefaultFieldValueValidatorsFactory.cs

@@ -18,15 +18,15 @@ namespace Squidex.Domain.Apps.Core.ValidateContent
     internal sealed class DefaultFieldValueValidatorsFactory : IFieldVisitor<IEnumerable<IValidator>>
     {
         private readonly ValidatorContext context;
-        private readonly FieldValidatorFactory createFieldValidator;
+        private readonly ValidatorFactory createFieldValidator;
 
-        private DefaultFieldValueValidatorsFactory(ValidatorContext context, FieldValidatorFactory createFieldValidator)
+        private DefaultFieldValueValidatorsFactory(ValidatorContext context, ValidatorFactory createFieldValidator)
         {
             this.context = context;
             this.createFieldValidator = createFieldValidator;
         }
 
-        public static IEnumerable<IValidator> CreateValidators(ValidatorContext context, IField field, FieldValidatorFactory createFieldValidator)
+        public static IEnumerable<IValidator> CreateValidators(ValidatorContext context, IField field, ValidatorFactory createFieldValidator)
         {
             Guard.NotNull(context, nameof(context));
             Guard.NotNull(field, nameof(field));

backend/src/Squidex.Domain.Apps.Core.Operations/ValidateContent/DefaultValidatorsFactory.cs

@@ -13,7 +13,7 @@ namespace Squidex.Domain.Apps.Core.ValidateContent
 {
     public sealed class DefaultValidatorsFactory : IValidatorsFactory
     {
-        public IEnumerable<IValidator> CreateFieldValidators(ValidatorContext context, IField field, FieldValidatorFactory createFieldValidator)
+        public IEnumerable<IValidator> CreateFieldValidators(ValidatorContext context, IField field, ValidatorFactory createFieldValidator)
         {
             if (field is IField<UIFieldProperties>)
             {
@@ -21,7 +21,7 @@ namespace Squidex.Domain.Apps.Core.ValidateContent
             }
         }
 
-        public IEnumerable<IValidator> CreateValueValidators(ValidatorContext context, IField field, FieldValidatorFactory createFieldValidator)
+        public IEnumerable<IValidator> CreateValueValidators(ValidatorContext context, IField field, ValidatorFactory createFieldValidator)
         {
             return DefaultFieldValueValidatorsFactory.CreateValidators(context, field, createFieldValidator);
         }

backend/src/Squidex.Domain.Apps.Core.Operations/ValidateContent/IValidatorsFactory.cs

@@ -10,21 +10,21 @@ using Squidex.Domain.Apps.Core.Schemas;
 
 namespace Squidex.Domain.Apps.Core.ValidateContent
 {
-    public delegate IValidator FieldValidatorFactory(IField field);
+    public delegate IValidator ValidatorFactory(IField field);
 
     public interface IValidatorsFactory
     {
-        IEnumerable<IValidator> CreateFieldValidators(ValidatorContext context, IField field, FieldValidatorFactory createFieldValidator)
+        IEnumerable<IValidator> CreateFieldValidators(ValidatorContext context, IField field, ValidatorFactory createFieldValidator)
         {
             yield break;
         }
 
-        IEnumerable<IValidator> CreateValueValidators(ValidatorContext context, IField field, FieldValidatorFactory createFieldValidator)
+        IEnumerable<IValidator> CreateValueValidators(ValidatorContext context, IField field, ValidatorFactory createFieldValidator)
         {
             yield break;
         }
 
-        IEnumerable<IValidator> CreateContentValidators(ValidatorContext context, FieldValidatorFactory createFieldValidator)
+        IEnumerable<IValidator> CreateContentValidators(ValidatorContext context, ValidatorFactory createFieldValidator)
         {
             yield break;
         }

backend/src/Squidex.Domain.Apps.Core.Operations/ValidateContent/JsonValueConverter.cs

@@ -9,6 +9,7 @@ using System;
 using System.Collections.Generic;
 using NodaTime.Text;
 using Squidex.Domain.Apps.Core.Schemas;
+using Squidex.Infrastructure;
 using Squidex.Infrastructure.Json.Objects;
 using Squidex.Infrastructure.Translations;
 using Squidex.Infrastructure.Validation;
@@ -36,12 +37,12 @@ namespace Squidex.Domain.Apps.Core.ValidateContent
 
         public (object? Result, JsonError? Error) Visit(IField<AssetsFieldProperties> field)
         {
-            return ConvertToStringList();
+            return ConvertToIdList();
         }
 
         public (object? Result, JsonError? Error) Visit(IField<ReferencesFieldProperties> field)
         {
-            return ConvertToStringList();
+            return ConvertToIdList();
         }
 
         public (object? Result, JsonError? Error) Visit(IField<TagsFieldProperties> field)
@@ -153,6 +154,30 @@ namespace Squidex.Domain.Apps.Core.ValidateContent
             return (value, null);
         }
 
+        private (object? Result, JsonError? Error) ConvertToIdList()
+        {
+            if (value is JsonArray array)
+            {
+                var result = new List<DomainId>(array.Count);
+
+                foreach (var item in array)
+                {
+                    if (item is JsonString s && !string.IsNullOrWhiteSpace(s.Value))
+                    {
+                        result.Add(DomainId.Create(s.Value));
+                    }
+                    else
+                    {
+                        return (null, new JsonError("Invalid json type, expected array of strings."));
+                    }
+                }
+
+                return (result, null);
+            }
+
+            return (null, new JsonError("Invalid json type, expected array of strings."));
+        }
+
         private (object? Result, JsonError? Error) ConvertToStringList()
         {
             if (value is JsonArray array)

backend/src/Squidex.Domain.Apps.Core.Operations/ValidateContent/Validators/AggregateValidator.cs

@@ -14,7 +14,7 @@ using Squidex.Infrastructure.Translations;
 
 namespace Squidex.Domain.Apps.Core.ValidateContent.Validators
 {
-    internal sealed class AggregateValidator : IValidator
+    public sealed class AggregateValidator : IValidator
     {
         private readonly IValidator[]? validators;
         private readonly ISemanticLog log;

backend/src/Squidex.Domain.Apps.Core.Operations/ValidateContent/Validators/CollectionItemValidator.cs

@@ -14,13 +14,13 @@ namespace Squidex.Domain.Apps.Core.ValidateContent.Validators
 {
     public sealed class CollectionItemValidator : IValidator
     {
-        private readonly IValidator[] itemValidators;
+        private readonly IValidator itemValidator;
 
-        public CollectionItemValidator(params IValidator[] itemValidators)
+        public CollectionItemValidator(IValidator itemValidator)
         {
-            Guard.NotEmpty(itemValidators, nameof(itemValidators));
+            Guard.NotNull(itemValidator, nameof(itemValidator));
 
-            this.itemValidators = itemValidators;
+            this.itemValidator = itemValidator;
         }
 
         public async Task ValidateAsync(object? value, ValidationContext context, AddError addError)
@@ -34,10 +34,7 @@ namespace Squidex.Domain.Apps.Core.ValidateContent.Validators
                 {
                     var innerContext = context.Nested($"[{index}]");
 
-                    foreach (var itemValidator in itemValidators)
-                    {
-                        innerTasks.Add(itemValidator.ValidateAsync(item, innerContext, addError));
-                    }
+                    await itemValidator.ValidateAsync(item, innerContext, addError);
 
                     index++;
                 }

backend/src/Squidex.Domain.Apps.Core.Operations/ValidateContent/Validators/FieldValidator.cs

@@ -5,9 +5,6 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Threading.Tasks;
 using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Infrastructure;
@@ -18,16 +15,16 @@ namespace Squidex.Domain.Apps.Core.ValidateContent.Validators
 {
     public sealed class FieldValidator : IValidator
     {
-        private readonly IValidator[] validators;
+        private readonly IValidator fieldValueValidator;
         private readonly IField field;
 
-        public FieldValidator(IEnumerable<IValidator>? validators, IField field)
+        public FieldValidator(IValidator fieldValueValidator, IField field)
         {
             Guard.NotNull(field, nameof(field));
-
-            this.validators = validators?.ToArray() ?? Array.Empty<IValidator>();
+            Guard.NotNull(fieldValueValidator, nameof(fieldValueValidator));
 
             this.field = field;
+            this.fieldValueValidator = fieldValueValidator;
         }
 
         public async Task ValidateAsync(object? value, ValidationContext context, AddError addError)
@@ -63,17 +60,7 @@ namespace Squidex.Domain.Apps.Core.ValidateContent.Validators
                 return;
             }
 
-            if (validators.Length > 0)
-            {
-                var tasks = new List<Task>();
-
-                foreach (var validator in validators)
-                {
-                    tasks.Add(validator.ValidateAsync(typedValue, context, addError));
-                }
-
-                await Task.WhenAll(tasks);
-            }
+            await fieldValueValidator.ValidateAsync(typedValue, context, addError);
         }
     }
 }

backend/src/Squidex.Domain.Apps.Entities/Contents/Validation/DependencyValidatorsFactory.cs

@@ -29,7 +29,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.Validation
             this.contentRepository = contentRepository;
         }
 
-        public IEnumerable<IValidator> CreateValueValidators(ValidatorContext context, IField field, FieldValidatorFactory createFieldValidator)
+        public IEnumerable<IValidator> CreateValueValidators(ValidatorContext context, IField field, ValidatorFactory createFieldValidator)
         {
             if (context.Mode == ValidationMode.Optimized)
             {

backend/tests/Squidex.Domain.Apps.Core.Tests/Operations/ValidateContent/AssetsFieldTests.cs

@@ -5,10 +5,16 @@
 //  All rights reserved. Licensed under the MIT license.
 // ==========================================================================
 
+using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Threading.Tasks;
+using FluentAssertions;
 using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Core.TestHelpers;
+using Squidex.Domain.Apps.Core.ValidateContent;
+using Squidex.Domain.Apps.Core.ValidateContent.Validators;
+using Squidex.Infrastructure.Json.Objects;
 using Xunit;
 
 namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
@@ -16,6 +22,28 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
     public class AssetsFieldTests : IClassFixture<TranslationsFixture>
     {
         private readonly List<string> errors = new List<string>();
+        private readonly IValidatorsFactory factory;
+
+        private class CustomFactory : IValidatorsFactory
+        {
+            public IEnumerable<IValidator> CreateValueValidators(ValidatorContext context, IField field, ValidatorFactory createFieldValidator)
+            {
+                if (field is IField<AssetsFieldProperties> assets)
+                {
+                    yield return new AssetsValidator(assets.Properties.IsRequired, assets.Properties, ids =>
+                    {
+                        var result = ids.Select(TestAssets.Document).ToList();
+
+                        return Task.FromResult<IReadOnlyList<IAssetInfo>>(result);
+                    });
+                }
+            }
+        }
+
+        public AssetsFieldTests()
+        {
+            factory = new CustomFactory();
+        }
 
         [Fact]
         public void Should_instantiate_field()
@@ -30,11 +58,93 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
         {
             var sut = Field(new AssetsFieldProperties());
 
-            await sut.ValidateAsync(null, errors);
+            await sut.ValidateAsync(CreateValue(null), errors, factory: factory);
 
             Assert.Empty(errors);
         }
 
+        [Fact]
+        public async Task Should_not_add_error_if_number_of_assets_is_equal_to_min_and_max_items()
+        {
+            var sut = Field(new AssetsFieldProperties { MinItems = 2, MaxItems = 2 });
+
+            await sut.ValidateAsync(CreateValue(Guid.NewGuid(), Guid.NewGuid()), errors, factory: factory);
+
+            Assert.Empty(errors);
+        }
+
+        [Fact]
+        public async Task Should_not_add_error_if_duplicate_values_are_ignored()
+        {
+            var sut = Field(new AssetsFieldProperties { AllowDuplicates = true });
+
+            await sut.ValidateAsync(CreateValue(Guid.NewGuid(), Guid.NewGuid()), errors, factory: factory);
+
+            Assert.Empty(errors);
+        }
+
+        [Fact]
+        public async Task Should_add_error_if_assets_are_required_and_null()
+        {
+            var sut = Field(new AssetsFieldProperties { IsRequired = true });
+
+            await sut.ValidateAsync(CreateValue(null), errors, factory: factory);
+
+            errors.Should().BeEquivalentTo(
+                new[] { "Field is required." });
+        }
+
+        [Fact]
+        public async Task Should_add_error_if_assets_are_required_and_empty()
+        {
+            var sut = Field(new AssetsFieldProperties { IsRequired = true });
+
+            await sut.ValidateAsync(CreateValue(), errors, factory: factory);
+
+            errors.Should().BeEquivalentTo(
+                new[] { "Field is required." });
+        }
+
+        [Fact]
+        public async Task Should_add_error_if_value_has_not_enough_items()
+        {
+            var sut = Field(new AssetsFieldProperties { MinItems = 3 });
+
+            await sut.ValidateAsync(CreateValue(Guid.NewGuid(), Guid.NewGuid()), errors, factory: factory);
+
+            errors.Should().BeEquivalentTo(
+                new[] { "Must have at least 3 item(s)." });
+        }
+
+        [Fact]
+        public async Task Should_add_error_if_value_has_too_much_items()
+        {
+            var sut = Field(new AssetsFieldProperties { MaxItems = 1 });
+
+            await sut.ValidateAsync(CreateValue(Guid.NewGuid(), Guid.NewGuid()), errors, factory: factory);
+
+            errors.Should().BeEquivalentTo(
+                new[] { "Must not have more than 1 item(s)." });
+        }
+
+        [Fact]
+        public async Task Should_add_error_if_values_contains_duplicate()
+        {
+            var sut = Field(new AssetsFieldProperties());
+
+            var id = Guid.NewGuid();
+
+            await sut.ValidateAsync(CreateValue(id, id), errors, factory: factory);
+
+            errors.Should().BeEquivalentTo(
+                new[] { "Must not contain duplicate values." });
+        }
+
+        private static IJsonValue CreateValue(params Guid[]? ids)
+        {
+            return ids == null ? JsonValue.Null : JsonValue.Array(ids.Select(x => (object)x.ToString()).ToArray());
+        }
+
         private static RootField<AssetsFieldProperties> Field(AssetsFieldProperties properties)
         {
             return Fields.Assets(1, "my-assets", Partitioning.Invariant, properties);

backend/tests/Squidex.Domain.Apps.Core.Tests/Operations/ValidateContent/ContentValidationTests.cs

@@ -39,7 +39,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
 
             var validatorFactory = A.Fake<IValidatorsFactory>();
 
-            A.CallTo(() => validatorFactory.CreateValueValidators(A<ValidationContext>._, A<IField>._, A<FieldValidatorFactory>._))
+            A.CallTo(() => validatorFactory.CreateValueValidators(A<ValidationContext>._, A<IField>._, A<ValidatorFactory>._))
                 .Returns(Enumerable.Repeat(validator, 1));
 
             schema = schema.AddNumber(1, "my-field", Partitioning.Invariant,
@@ -70,7 +70,7 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
 
             var validatorFactory = A.Fake<IValidatorsFactory>();
 
-            A.CallTo(() => validatorFactory.CreateFieldValidators(A<ValidationContext>._, A<IField>._, A<FieldValidatorFactory>._))
+            A.CallTo(() => validatorFactory.CreateFieldValidators(A<ValidationContext>._, A<IField>._, A<ValidatorFactory>._))
                 .Returns(Enumerable.Repeat(validator, 1));
 
             schema = schema.AddNumber(1, "my-field", Partitioning.Invariant,

backend/tests/Squidex.Domain.Apps.Core.Tests/Operations/ValidateContent/ReferencesFieldTests.cs

@@ -6,9 +6,16 @@
 // ==========================================================================
 
 using System.Collections.Generic;
+using System.Linq;
 using System.Threading.Tasks;
+using FluentAssertions;
+using Squidex.Domain.Apps.Core.Contents;
 using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Core.TestHelpers;
+using Squidex.Domain.Apps.Core.ValidateContent;
+using Squidex.Domain.Apps.Core.ValidateContent.Validators;
+using Squidex.Infrastructure;
+using Squidex.Infrastructure.Json.Objects;
 using Xunit;
 
 namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
@@ -16,6 +23,38 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
     public class ReferencesFieldTests : IClassFixture<TranslationsFixture>
     {
         private readonly List<string> errors = new List<string>();
+        private readonly DomainId schemaId = DomainId.NewGuid();
+        private readonly DomainId ref1 = DomainId.NewGuid();
+        private readonly DomainId ref2 = DomainId.NewGuid();
+        private readonly IValidatorsFactory factory;
+
+        private class CustomFactory : IValidatorsFactory
+        {
+            private readonly DomainId schemaId;
+
+            public CustomFactory(DomainId schemaId)
+            {
+                this.schemaId = schemaId;
+            }
+
+            public IEnumerable<IValidator> CreateValueValidators(ValidatorContext context, IField field, ValidatorFactory createFieldValidator)
+            {
+                if (field is IField<ReferencesFieldProperties> references)
+                {
+                    yield return new ReferencesValidator(references.Properties.IsRequired, references.Properties, ids =>
+                    {
+                        var result = ids.Select(x => (schemaId, x, Status.Published)).ToList();
+
+                        return Task.FromResult<IReadOnlyList<(DomainId SchemaId, DomainId Id, Status Status)>>(result);
+                    });
+                }
+            }
+        }
+
+        public ReferencesFieldTests()
+        {
+            factory = new CustomFactory(schemaId);
+        }
 
         [Fact]
         public void Should_instantiate_field()
@@ -25,16 +64,106 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
             Assert.Equal("my-refs", sut.Name);
         }
 
+        [Fact]
+        public async Task Should_not_add_error_if_references_are_valid()
+        {
+            var sut = Field(new ReferencesFieldProperties());
+
+            await sut.ValidateAsync(CreateValue(ref1), errors, factory: factory);
+
+            Assert.Empty(errors);
+        }
+
         [Fact]
         public async Task Should_not_add_error_if_references_are_null_and_valid()
         {
             var sut = Field(new ReferencesFieldProperties());
 
-            await sut.ValidateAsync(null, errors);
+            await sut.ValidateAsync(CreateValue(null), errors, factory: factory);
+
+            Assert.Empty(errors);
+        }
+
+        [Fact]
+        public async Task Should_not_add_error_if_number_of_references_is_equal_to_min_and_max_items()
+        {
+            var sut = Field(new ReferencesFieldProperties { MinItems = 2, MaxItems = 2 });
+
+            await sut.ValidateAsync(CreateValue(ref1, ref2), errors, factory: factory);
 
             Assert.Empty(errors);
         }
 
+        [Fact]
+        public async Task Should_not_add_error_if_duplicate_values_are_allowed()
+        {
+            var sut = Field(new ReferencesFieldProperties { MinItems = 2, MaxItems = 2, AllowDuplicates = true });
+
+            await sut.ValidateAsync(CreateValue(ref1, ref1), errors, factory: factory);
+
+            Assert.Empty(errors);
+        }
+
+        [Fact]
+        public async Task Should_add_error_if_references_are_required_and_null()
+        {
+            var sut = Field(new ReferencesFieldProperties { SchemaId = schemaId, IsRequired = true });
+
+            await sut.ValidateAsync(CreateValue(null), errors, factory: factory);
+
+            errors.Should().BeEquivalentTo(
+                new[] { "Field is required." });
+        }
+
+        [Fact]
+        public async Task Should_add_error_if_references_are_required_and_empty()
+        {
+            var sut = Field(new ReferencesFieldProperties { SchemaId = schemaId, IsRequired = true });
+
+            await sut.ValidateAsync(CreateValue(), errors, factory: factory);
+
+            errors.Should().BeEquivalentTo(
+                new[] { "Field is required." });
+        }
+
+        [Fact]
+        public async Task Should_add_error_if_value_has_not_enough_items()
+        {
+            var sut = Field(new ReferencesFieldProperties { SchemaId = schemaId, MinItems = 3 });
+
+            await sut.ValidateAsync(CreateValue(ref1, ref2), errors, factory: factory);
+
+            errors.Should().BeEquivalentTo(
+                new[] { "Must have at least 3 item(s)." });
+        }
+
+        [Fact]
+        public async Task Should_add_error_if_value_has_too_much_items()
+        {
+            var sut = Field(new ReferencesFieldProperties { SchemaId = schemaId, MaxItems = 1 });
+
+            await sut.ValidateAsync(CreateValue(ref1, ref2), errors, factory: factory);
+
+            errors.Should().BeEquivalentTo(
+                new[] { "Must not have more than 1 item(s)." });
+        }
+
+        [Fact]
+        public async Task Should_add_error_if_reference_contains_duplicate_values()
+        {
+            var sut = Field(new ReferencesFieldProperties { SchemaId = schemaId });
+
+            await sut.ValidateAsync(CreateValue(ref1, ref1), errors, factory: factory);
+
+            errors.Should().BeEquivalentTo(
+                new[] { "Must not contain duplicate values." });
+        }
+
+        private static IJsonValue CreateValue(params DomainId[]? ids)
+        {
+            return ids == null ? JsonValue.Null : JsonValue.Array(ids.Select(x => (object)x.ToString()).ToArray());
+        }
+
         private static RootField<ReferencesFieldProperties> Field(ReferencesFieldProperties properties)
         {
             return Fields.References(1, "my-refs", Partitioning.Invariant, properties);

backend/tests/Squidex.Domain.Apps.Core.Tests/Operations/ValidateContent/ValidationTestExtensions.cs

@@ -49,8 +49,9 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
             var context = CreateContext(schema, mode, updater, action);
 
             var validators = Factories(factory).SelectMany(x => x.CreateValueValidators(context, field, null!)).ToArray();
+            var validator = new AggregateValidator(validators, Log);
 
-            return new FieldValidator(validators, field)
+            return new FieldValidator(validator, field)
                 .ValidateAsync(value, context, CreateFormatter(errors));
         }
 

backend/tests/Squidex.Domain.Apps.Core.Tests/Operations/ValidateContent/Validators/AssetsValidatorTests.cs

@@ -9,7 +9,6 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using FluentAssertions;
-using Squidex.Domain.Apps.Core.Assets;
 using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Core.TestHelpers;
 using Squidex.Domain.Apps.Core.ValidateContent;
@@ -23,61 +22,9 @@ namespace Squidex.Domain.Apps.Core.Operations.ValidateContent.Validators
     public class AssetsValidatorTests : IClassFixture<TranslationsFixture>
     {
         private readonly List<string> errors = new List<string>();
-
-        public sealed class AssetInfo : IAssetInfo
-        {
-            public DomainId AssetId { get; set; }
-
-            public string FileName { get; set; }
-
-            public string FileHash { get; set; }
-
-            public string Slug { get; set; }
-
-            public long FileSize { get; set; }
-
-            public bool IsImage { get; set; }
-
-            public int? PixelWidth { get; set; }
-
-            public int? PixelHeight { get; set; }
-
-            public AssetMetadata Metadata { get; set; }
-
-            public AssetType Type { get; set; }
-        }
-
-        private readonly AssetInfo document = new AssetInfo
-        {
-            AssetId = DomainId.NewGuid(),
-            FileName = "MyDocument.pdf",
-            FileSize = 1024 * 4,
-            Type = AssetType.Unknown
-        };
-
-        private readonly AssetInfo image1 = new AssetInfo
-        {
-            AssetId = DomainId.NewGuid(),
-            FileName = "MyImage.png",
-            FileSize = 1024 * 8,
-            Type = AssetType.Image,
-            Metadata =
-                new AssetMetadata()
-                    .SetPixelWidth(800)
-                    .SetPixelHeight(600)
-        };
-
-        private readonly AssetInfo image2 = new AssetInfo
-        {
-            AssetId = DomainId.NewGuid(),
-            FileName = "MyImage.png",
-            FileSize = 1024 * 8,
-            Type = AssetType.Image,
-            Metadata =
-                new AssetMetadata()
-                    .SetPixelWidth(800)
-                    .SetPixelHeight(600)
-        };
+        private readonly IAssetInfo document = TestAssets.Document(DomainId.NewGuid());
+        private readonly IAssetInfo image1 = TestAssets.Image(DomainId.NewGuid());
+        private readonly IAssetInfo image2 = TestAssets.Image(DomainId.NewGuid());
 
         [Fact]
         public async Task Should_not_add_error_if_assets_are_valid()

backend/tests/Squidex.Domain.Apps.Core.Tests/TestHelpers/TestAssets.cs

@@ -0,0 +1,65 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using Squidex.Domain.Apps.Core.Assets;
+using Squidex.Domain.Apps.Core.ValidateContent;
+using Squidex.Infrastructure;
+
+namespace Squidex.Domain.Apps.Core.TestHelpers
+{
+    public static class TestAssets
+    {
+        public sealed class AssetInfo : IAssetInfo
+        {
+            public DomainId AssetId { get; set; }
+
+            public string FileName { get; set; }
+
+            public string FileHash { get; set; }
+
+            public string Slug { get; set; }
+
+            public long FileSize { get; set; }
+
+            public bool IsImage { get; set; }
+
+            public int? PixelWidth { get; set; }
+
+            public int? PixelHeight { get; set; }
+
+            public AssetMetadata Metadata { get; set; }
+
+            public AssetType Type { get; set; }
+        }
+
+        public static AssetInfo Document(DomainId id)
+        {
+            return new AssetInfo
+            {
+                AssetId = id,
+                FileName = "MyDocument.pdf",
+                FileSize = 1024 * 4,
+                Type = AssetType.Unknown
+            };
+        }
+
+        public static AssetInfo Image(DomainId id)
+        {
+            return new AssetInfo
+            {
+                AssetId = id,
+                FileName = "MyImage.png",
+                FileSize = 1024 * 8,
+                Type = AssetType.Image,
+                Metadata =
+                    new AssetMetadata()
+                        .SetPixelWidth(800)
+                        .SetPixelHeight(600)
+            };
+        }
+    }
+}