Handlebars Extension (#286)

* wip * HandlebarsRegistrationCallback * HandlebarsContextFactoryTests * 1.0.21.0 * fix sonar * LocalFileSystemHandler * readme * Fix System.IO.IOException
2026-03-24 18:11:10 +01:00 · 2019-07-03 18:37:22 +02:00
parent 653e03fcd9
commit 93682c9bbf
37 changed files with 366 additions and 208 deletions
--- a/test/WireMock.Net.Tests/ResponseBuilders/ResponseCreateTests.cs
+++ b/test/WireMock.Net.Tests/ResponseBuilders/ResponseCreateTests.cs
@@ -1,16 +1,16 @@
-using System.Threading.Tasks;
-using Moq;
+using Moq;
 using NFluent;
-using WireMock.Handlers;
+using System.Threading.Tasks;
 using WireMock.Models;
 using WireMock.ResponseBuilders;
+using WireMock.Settings;
 using Xunit;

 namespace WireMock.Net.Tests.ResponseBuilders
 {
    public class ResponseCreateTests
    {
-        private readonly Mock<IFileSystemHandler> _fileSystemHandlerMock = new Mock<IFileSystemHandler>();
+        private readonly Mock<IFluentMockServerSettings> _settingsMock = new Mock<IFluentMockServerSettings>();

        [Fact]
        public async Task Response_Create_Func()
@@ -22,7 +22,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create(() => responseMessage);

            // Act
-            var providedResponse = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var providedResponse = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(providedResponse).Equals(responseMessage);
--- a/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithBodyTests.cs
+++ b/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithBodyTests.cs
@@ -4,9 +4,9 @@ using NFluent;
 using System;
 using System.Text;
 using System.Threading.Tasks;
-using WireMock.Handlers;
 using WireMock.Models;
 using WireMock.ResponseBuilders;
+using WireMock.Settings;
 using WireMock.Util;
 using Xunit;

@@ -14,7 +14,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
 {
    public class ResponseWithBodyTests
    {
-        private readonly Mock<IFileSystemHandler> _fileSystemHandlerMock = new Mock<IFileSystemHandler>();
+        private readonly Mock<IFluentMockServerSettings> _settingsMock = new Mock<IFluentMockServerSettings>();
        private const string ClientIp = "::1";

        [Fact]
@@ -31,7 +31,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create().WithBody(new byte[] { 48, 49 }, BodyDestinationFormat.String, Encoding.ASCII);

            // act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // then
            Check.That(responseMessage.BodyData.BodyAsString).Equals("01");
@@ -53,7 +53,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create().WithBody(new byte[] { 48, 49 }, BodyDestinationFormat.SameAsSource, Encoding.ASCII);

            // act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // then
            Check.That(responseMessage.BodyData.BodyAsBytes).ContainsExactly(new byte[] { 48, 49 });
@@ -75,7 +75,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create().WithBody("test", null, Encoding.ASCII);

            // act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // then
            Check.That(responseMessage.BodyData.BodyAsString).Equals("test");
@@ -97,7 +97,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create().WithBodyAsJson(x, Encoding.ASCII);

            // act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // then
            Check.That(responseMessage.BodyData.BodyAsJson).Equals(x);
@@ -119,7 +119,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create().WithBodyAsJson(x, true);

            // act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // then
            Check.That(responseMessage.BodyData.BodyAsJson).Equals(x);
@@ -135,7 +135,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create().WithBody("r", BodyDestinationFormat.SameAsSource, Encoding.ASCII);

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsBytes).IsNull();
@@ -153,7 +153,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create().WithBody("r", BodyDestinationFormat.Bytes, Encoding.ASCII);

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).IsNull();
@@ -171,7 +171,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create().WithBody("{ \"value\": 42 }", BodyDestinationFormat.Json, Encoding.ASCII);

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).IsNull();
@@ -193,7 +193,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithBody(req => $"path: {req.Path}");

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).IsEqualTo("path: /test");
@@ -221,8 +221,8 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var response1Message = await response.ProvideResponseAsync(request1, _fileSystemHandlerMock.Object);
-            var response2Message = await response.ProvideResponseAsync(request2, _fileSystemHandlerMock.Object);
+            var response1Message = await response.ProvideResponseAsync(request1, _settingsMock.Object);
+            var response2Message = await response.ProvideResponseAsync(request2, _settingsMock.Object);

            // Assert
            Check.That(((JToken)response1Message.BodyData.BodyAsJson).SelectToken("id")?.Value<int>()).IsEqualTo(request1Id);
@@ -246,7 +246,7 @@ namespace WireMock.Net.Tests.ResponseBuilders

            var response = Response.Create().WithStatusCode(200).WithBody(fileContents);

-            var provideResponseAsync = await response.ProvideResponseAsync(request1, _fileSystemHandlerMock.Object);
+            var provideResponseAsync = await response.ProvideResponseAsync(request1, _settingsMock.Object);

            Check.That(provideResponseAsync.StatusCode).IsEqualTo(200);
            Check.That(provideResponseAsync.BodyData.BodyAsString).Contains(fileContents);
@@ -262,7 +262,7 @@ namespace WireMock.Net.Tests.ResponseBuilders

            var response = Response.Create().WithStatusCode(200).WithBody(fileContents);

-            var provideResponseAsync = await response.ProvideResponseAsync(request1, _fileSystemHandlerMock.Object);
+            var provideResponseAsync = await response.ProvideResponseAsync(request1, _settingsMock.Object);

            Check.That(provideResponseAsync.StatusCode).IsEqualTo(200);
            Check.That(provideResponseAsync.BodyData.BodyAsString).Contains(fileContents);
@@ -278,7 +278,7 @@ namespace WireMock.Net.Tests.ResponseBuilders

            var response = Response.Create().WithStatusCode(200).WithBody("File deleted.");

-            var provideResponseAsync = await response.ProvideResponseAsync(request1, _fileSystemHandlerMock.Object);
+            var provideResponseAsync = await response.ProvideResponseAsync(request1, _settingsMock.Object);

            Check.That(provideResponseAsync.StatusCode).IsEqualTo(200);
            Check.That(provideResponseAsync.BodyData.BodyAsString).Contains("File deleted.");
--- a/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithCallbackTests.cs
+++ b/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithCallbackTests.cs
@@ -1,9 +1,9 @@
 using Moq;
 using NFluent;
 using System.Threading.Tasks;
-using WireMock.Handlers;
 using WireMock.Models;
 using WireMock.ResponseBuilders;
+using WireMock.Settings;
 using WireMock.Util;
 using Xunit;

@@ -11,7 +11,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
 {
    public class ResponseWithCallbackTests
    {
-        private readonly Mock<IFileSystemHandler> _fileSystemHandlerMock = new Mock<IFileSystemHandler>();
+        private readonly Mock<IFluentMockServerSettings> _settingsMock = new Mock<IFluentMockServerSettings>();

        [Fact]
        public async Task Response_WithCallback()
@@ -21,7 +21,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create().WithCallback(req => new ResponseMessage { BodyData = new BodyData { DetectedBodyType = BodyType.String, BodyAsString = req.Path + "Bar" }, StatusCode = 302 });

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).IsEqualTo("/fooBar");
--- a/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsFileTests.cs
+++ b/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsFileTests.cs
@@ -6,6 +6,7 @@ using System.Threading.Tasks;
 using WireMock.Handlers;
 using WireMock.Models;
 using WireMock.ResponseBuilders;
+using WireMock.Settings;
 using Xunit;

 namespace WireMock.Net.Tests.ResponseBuilders
@@ -13,12 +14,16 @@ namespace WireMock.Net.Tests.ResponseBuilders
    public class ResponseWithHandlebarsFileTests
    {
        private readonly Mock<IFileSystemHandler> _filesystemHandlerMock;
+        private readonly Mock<IFluentMockServerSettings> _settingsMock;
        private const string ClientIp = "::1";

        public ResponseWithHandlebarsFileTests()
        {
            _filesystemHandlerMock = new Mock<IFileSystemHandler>(MockBehavior.Strict);
            _filesystemHandlerMock.Setup(fs => fs.ReadResponseBodyAsString(It.IsAny<string>())).Returns("abc");
+
+            _settingsMock = new Mock<IFluentMockServerSettings>();
+            _settingsMock.SetupGet(s => s.FileSystemHandler).Returns(_filesystemHandlerMock.Object);
        }

        [Fact]
@@ -35,7 +40,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _filesystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
@@ -60,7 +65,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _filesystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
@@ -85,7 +90,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            Check.ThatAsyncCode(() => response.ProvideResponseAsync(request, _filesystemHandlerMock.Object)).Throws<ArgumentOutOfRangeException>();
+            Check.ThatAsyncCode(() => response.ProvideResponseAsync(request, _settingsMock.Object)).Throws<ArgumentOutOfRangeException>();

            // Verify
            _filesystemHandlerMock.Verify(fs => fs.ReadResponseBodyAsString(It.IsAny<string>()), Times.Never);
--- a/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsJsonPathTests.cs
+++ b/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsJsonPathTests.cs
@@ -1,11 +1,11 @@
-using System;
-using System.Threading.Tasks;
-using Moq;
+using Moq;
 using Newtonsoft.Json.Linq;
 using NFluent;
-using WireMock.Handlers;
+using System;
+using System.Threading.Tasks;
 using WireMock.Models;
 using WireMock.ResponseBuilders;
+using WireMock.Settings;
 using WireMock.Util;
 using Xunit;

@@ -13,7 +13,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
 {
    public class ResponseWithHandlebarsJsonPathTests
    {
-        private readonly Mock<IFileSystemHandler> _fileSystemHandlerMock = new Mock<IFileSystemHandler>();
+        private readonly Mock<IFluentMockServerSettings> _settingsMock = new Mock<IFluentMockServerSettings>();
        private const string ClientIp = "::1";

        [Fact]
@@ -63,7 +63,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
@@ -89,7 +89,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
@@ -143,7 +143,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals($"{{{Environment.NewLine}  \"Name\": \"Acme Co\",{Environment.NewLine}  \"Products\": [{Environment.NewLine}    {{{Environment.NewLine}      \"Name\": \"Anvil\",{Environment.NewLine}      \"Price\": 50{Environment.NewLine}    }}{Environment.NewLine}  ]{Environment.NewLine}}}");
@@ -196,7 +196,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals($"{{{Environment.NewLine}  \"Name\": \"Acme Co\",{Environment.NewLine}  \"Products\": [{Environment.NewLine}    {{{Environment.NewLine}      \"Name\": \"Anvil\",{Environment.NewLine}      \"Price\": 50{Environment.NewLine}    }}{Environment.NewLine}  ]{Environment.NewLine}}}");
@@ -249,7 +249,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("%0:Anvil%%1:Elbow Grease%");
@@ -302,7 +302,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("%0:Anvil%%1:Elbow Grease%");
@@ -331,7 +331,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            Check.ThatAsyncCode(() => response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object)).Throws<ArgumentNullException>();
+            Check.ThatAsyncCode(() => response.ProvideResponseAsync(request, _settingsMock.Object)).Throws<ArgumentNullException>();
        }
    }
 }
--- a/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsLinqTests.cs
+++ b/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsLinqTests.cs
@@ -3,9 +3,9 @@ using Newtonsoft.Json.Linq;
 using NFluent;
 using System;
 using System.Threading.Tasks;
-using WireMock.Handlers;
 using WireMock.Models;
 using WireMock.ResponseBuilders;
+using WireMock.Settings;
 using WireMock.Util;
 using Xunit;

@@ -13,7 +13,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
 {
    public class ResponseWithHandlebarsLinqTests
    {
-        private readonly Mock<IFileSystemHandler> _fileSystemHandlerMock = new Mock<IFileSystemHandler>();
+        private readonly Mock<IFluentMockServerSettings> _settingsMock = new Mock<IFluentMockServerSettings>();

        [Fact]
        public async Task Response_ProvideResponse_Handlebars_Linq1_String0()
@@ -29,7 +29,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
@@ -59,7 +59,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
@@ -89,7 +89,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
@@ -119,7 +119,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
@@ -144,7 +144,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            Check.ThatAsyncCode(() => response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object)).Throws<NotSupportedException>();
+            Check.ThatAsyncCode(() => response.ProvideResponseAsync(request, _settingsMock.Object)).Throws<NotSupportedException>();
        }

        [Fact]
@@ -160,7 +160,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            Check.ThatAsyncCode(() => response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object)).Throws<ArgumentNullException>();
+            Check.ThatAsyncCode(() => response.ProvideResponseAsync(request, _settingsMock.Object)).Throws<ArgumentNullException>();
        }

        [Fact]
@@ -176,7 +176,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            Check.ThatAsyncCode(() => response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object)).Throws<ArgumentException>();
+            Check.ThatAsyncCode(() => response.ProvideResponseAsync(request, _settingsMock.Object)).Throws<ArgumentException>();
        }

        [Fact]
@@ -200,7 +200,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
@@ -228,7 +228,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
--- a/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsRandomTests.cs
+++ b/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsRandomTests.cs
@@ -1,18 +1,18 @@
-using System.Linq;
-using System.Threading.Tasks;
-using Moq;
+using Moq;
 using Newtonsoft.Json.Linq;
 using NFluent;
-using WireMock.Handlers;
+using System.Linq;
+using System.Threading.Tasks;
 using WireMock.Models;
 using WireMock.ResponseBuilders;
+using WireMock.Settings;
 using Xunit;

 namespace WireMock.Net.Tests.ResponseBuilders
 {
    public class ResponseWithHandlebarsRandomTests
    {
-        private readonly Mock<IFileSystemHandler> _fileSystemHandlerMock = new Mock<IFileSystemHandler>();
+        private readonly Mock<IFluentMockServerSettings> _settingsMock = new Mock<IFluentMockServerSettings>();
        private const string ClientIp = "::1";

        [Fact]
@@ -32,7 +32,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
@@ -55,7 +55,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
@@ -77,7 +77,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
@@ -101,7 +101,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
@@ -123,7 +123,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
--- a/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsRegexTests.cs
+++ b/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsRegexTests.cs
@@ -1,10 +1,10 @@
-using System;
-using System.Threading.Tasks;
-using Moq;
+using Moq;
 using NFluent;
-using WireMock.Handlers;
+using System;
+using System.Threading.Tasks;
 using WireMock.Models;
 using WireMock.ResponseBuilders;
+using WireMock.Settings;
 using WireMock.Util;
 using Xunit;

@@ -12,7 +12,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
 {
    public class ResponseWithHandlebarsRegexTests
    {
-        private readonly Mock<IFileSystemHandler> _fileSystemHandlerMock = new Mock<IFileSystemHandler>();
+        private readonly Mock<IFluentMockServerSettings> _settingsMock = new Mock<IFluentMockServerSettings>();
        private const string ClientIp = "::1";

        [Fact]
@@ -28,7 +28,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("abc");
@@ -47,7 +47,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("");
@@ -66,7 +66,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("d");
@@ -85,7 +85,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("5000-https");
@@ -104,7 +104,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("");
@@ -123,7 +123,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("x");
@@ -142,7 +142,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act and Assert
-            Check.ThatAsyncCode(() => response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object)).Throws<NotSupportedException>();
+            Check.ThatAsyncCode(() => response.ProvideResponseAsync(request, _settingsMock.Object)).Throws<NotSupportedException>();
        }
    }
 }
--- a/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsTests.cs
+++ b/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsTests.cs
@@ -5,9 +5,9 @@ using System.Threading.Tasks;
 using Moq;
 using Newtonsoft.Json;
 using NFluent;
-using WireMock.Handlers;
 using WireMock.Models;
 using WireMock.ResponseBuilders;
+using WireMock.Settings;
 using WireMock.Util;
 using Xunit;
 #if NET452
@@ -20,7 +20,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
 {
    public class ResponseWithHandlebarsTests
    {
-        private readonly Mock<IFileSystemHandler> _fileSystemHandlerMock = new Mock<IFileSystemHandler>();
+        private readonly Mock<IFluentMockServerSettings> _settingsMock = new Mock<IFluentMockServerSettings>();
        private const string ClientIp = "::1";

        [Fact]
@@ -41,7 +41,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(JsonConvert.SerializeObject(responseMessage.BodyData.BodyAsJson)).Equals("{\"x\":\"test /foo_object\"}");
@@ -63,7 +63,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("test http://localhost/foo /foo POSt");
@@ -81,7 +81,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("http://localhost/a/b http://localhost/wiremock/a/b /a/b /wiremock/a/b");
@@ -99,7 +99,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("a wiremock");
@@ -121,7 +121,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("test keya=1 idx=1 idx=2 keyb=5");
@@ -141,7 +141,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create().WithHeader("x", "{{request.headers.Content-Type}}").WithBody("test").WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("test");
@@ -163,7 +163,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create().WithHeader("x", "{{request.headers.Content-Type}}", "{{request.url}}").WithBody("test").WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("test");
@@ -188,7 +188,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).Equals("test http://localhost:1234 1234 http localhost");
@@ -212,7 +212,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(JsonConvert.SerializeObject(responseMessage.BodyData.BodyAsJson)).Equals("[\"first\",\"/foo_array\",\"test 1\",\"test 2\",\"last\"]");
@@ -229,7 +229,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithBodyFromFile(@"c:\\{{request.query.MyUniqueNumber}}\test.xml"); // why use a \\ here ?

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsFile).Equals(@"c:\1\test.xml");
@@ -256,7 +256,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithBodyFromFile(@"c:\\{{JsonPath.SelectToken request.body " + jsonPath + "}}\\test.json"); // why use a \\ here ?

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsFile).Equals(@"c:\1\test.json");
--- a/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsXegerTests.cs
+++ b/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsXegerTests.cs
@@ -1,17 +1,17 @@
-using System.Threading.Tasks;
-using Moq;
+using Moq;
 using Newtonsoft.Json.Linq;
 using NFluent;
-using WireMock.Handlers;
+using System.Threading.Tasks;
 using WireMock.Models;
 using WireMock.ResponseBuilders;
+using WireMock.Settings;
 using Xunit;

 namespace WireMock.Net.Tests.ResponseBuilders
 {
    public class ResponseWithHandlebarsXegerTests
    {
-        private readonly Mock<IFileSystemHandler> _fileSystemHandlerMock = new Mock<IFileSystemHandler>();
+        private readonly Mock<IFluentMockServerSettings> _settingsMock = new Mock<IFluentMockServerSettings>();
        private const string ClientIp = "::1";

        [Fact]
@@ -29,7 +29,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
@@ -52,7 +52,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
                .WithTransformer();

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            JObject j = JObject.FromObject(responseMessage.BodyData.BodyAsJson);
--- a/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHeadersTests.cs
+++ b/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHeadersTests.cs
@@ -1,10 +1,10 @@
-using System.Collections.Generic;
-using System.Threading.Tasks;
-using Moq;
+using Moq;
 using NFluent;
-using WireMock.Handlers;
+using System.Collections.Generic;
+using System.Threading.Tasks;
 using WireMock.Models;
 using WireMock.ResponseBuilders;
+using WireMock.Settings;
 using WireMock.Util;
 using Xunit;

@@ -12,7 +12,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
 {
    public class ResponseWithHeadersTests
    {
-        private readonly Mock<IFileSystemHandler> _fileSystemHandlerMock = new Mock<IFileSystemHandler>();
+        private readonly Mock<IFluentMockServerSettings> _settingsMock = new Mock<IFluentMockServerSettings>();
        private const string ClientIp = "::1";

        [Theory]
@@ -26,7 +26,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            IResponseBuilder builder = Response.Create().WithHeader(headerName, headerValue);

            // Act
-            var response = await builder.ProvideResponseAsync(requestMock, _fileSystemHandlerMock.Object);
+            var response = await builder.ProvideResponseAsync(requestMock, _settingsMock.Object);

            // Assert
            Check.That(response.Headers[headerName].ToString()).Equals(headerValue);
@@ -42,7 +42,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            IResponseBuilder builder = Response.Create().WithHeader(headerName, headerValues);

            // Act
-            var response = await builder.ProvideResponseAsync(requestMock, _fileSystemHandlerMock.Object);
+            var response = await builder.ProvideResponseAsync(requestMock, _settingsMock.Object);

            // Assert
            Check.That(response.Headers[headerName].ToArray()).Equals(headerValues);
@@ -57,7 +57,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create().WithHeaders(headers);

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.Headers["h"]).ContainsExactly("x");
@@ -72,7 +72,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create().WithHeaders(headers);

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.Headers["h"]).ContainsExactly("x");
@@ -87,7 +87,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
            var response = Response.Create().WithHeaders(headers);

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.Headers["h"]).ContainsExactly("x");
--- a/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithProxyTests.cs
+++ b/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithProxyTests.cs
@@ -1,13 +1,13 @@
-using System;
+using Moq;
+using NFluent;
+using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
-using Moq;
-using NFluent;
-using WireMock.Handlers;
 using WireMock.Models;
 using WireMock.RequestBuilders;
 using WireMock.ResponseBuilders;
 using WireMock.Server;
+using WireMock.Settings;
 using WireMock.Util;
 using Xunit;

@@ -15,7 +15,7 @@ namespace WireMock.Net.Tests.ResponseBuilders
 {
    public class ResponseWithProxyTests : IDisposable
    {
-        private readonly Mock<IFileSystemHandler> _fileSystemHandlerMock = new Mock<IFileSystemHandler>();
+        private readonly Mock<IFluentMockServerSettings> _settingsMock = new Mock<IFluentMockServerSettings>();
        private readonly FluentMockServer _server;
        private readonly Guid _guid;

@@ -33,11 +33,11 @@ namespace WireMock.Net.Tests.ResponseBuilders
        {
            // Assign
            var headers = new Dictionary<string, string[]> { { "Content-Type", new[] { "application/xml" } } };
-            var request = new RequestMessage(new UrlDetails($"{_server.Urls[0]}/{_guid}"), "POST", "::1", new BodyData { DetectedBodyType = BodyType.Json,  BodyAsJson = new { a = 1 } }, headers);
+            var request = new RequestMessage(new UrlDetails($"{_server.Urls[0]}/{_guid}"), "POST", "::1", new BodyData { DetectedBodyType = BodyType.Json, BodyAsJson = new { a = 1 } }, headers);
            var response = Response.Create().WithProxy(_server.Urls[0]);

            // Act
-            var responseMessage = await response.ProvideResponseAsync(request, _fileSystemHandlerMock.Object);
+            var responseMessage = await response.ProvideResponseAsync(request, _settingsMock.Object);

            // Assert
            Check.That(responseMessage.BodyData.BodyAsString).IsEqualTo("{\"p\":42}");
--- a/test/WireMock.Net.Tests/Serialization/MappingConverterTests.cs
+++ b/test/WireMock.Net.Tests/Serialization/MappingConverterTests.cs
@@ -1,17 +1,17 @@
 using FluentAssertions;
 using Moq;
 using System;
-using WireMock.Handlers;
 using WireMock.RequestBuilders;
 using WireMock.ResponseBuilders;
 using WireMock.Serialization;
+using WireMock.Settings;
 using Xunit;

 namespace WireMock.Net.Tests.Serialization
 {
    public class MappingConverterTests
    {
-        private readonly Mock<IFileSystemHandler> _fileSystemHandlerMock = new Mock<IFileSystemHandler>();
+        private readonly Mock<IFluentMockServerSettings> _settingsMock = new Mock<IFluentMockServerSettings>();

        [Fact]
        public void ToMappingModel()
@@ -19,7 +19,7 @@ namespace WireMock.Net.Tests.Serialization
            // Assign
            var request = Request.Create();
            var response = Response.Create();
-            var mapping = new Mapping(Guid.NewGuid(), "", null, _fileSystemHandlerMock.Object, request, response, 0, null, null, null);
+            var mapping = new Mapping(Guid.NewGuid(), "", null, _settingsMock.Object, request, response, 0, null, null, null);

            // Act
            var model = MappingConverter.ToMappingModel(mapping);
@@ -37,7 +37,7 @@ namespace WireMock.Net.Tests.Serialization
            // Assign
            var request = Request.Create();
            var response = Response.Create().WithBodyAsJson(new { x = "x" }).WithTransformer();
-            var mapping = new Mapping(Guid.NewGuid(), "", null, _fileSystemHandlerMock.Object, request, response, 42, null, null, null);
+            var mapping = new Mapping(Guid.NewGuid(), "", null, _settingsMock.Object, request, response, 42, null, null, null);

            // Act
            var model = MappingConverter.ToMappingModel(mapping);
--- a/test/WireMock.Net.Tests/Transformers/HandlebarsContextFactoryTests.cs
+++ b/test/WireMock.Net.Tests/Transformers/HandlebarsContextFactoryTests.cs
@@ -0,0 +1,52 @@
+using FluentAssertions;
+using HandlebarsDotNet;
+using Moq;
+using System;
+using WireMock.Handlers;
+using WireMock.Transformers;
+using Xunit;
+
+namespace WireMock.Net.Tests.Transformers
+{
+    public class HandlebarsContextFactoryTests
+    {
+        private readonly Mock<IFileSystemHandler> _fileSystemHandlerMock = new Mock<IFileSystemHandler>();
+
+        [Fact]
+        public void Create_WithNullAction_DoesNotInvokeAction()
+        {
+            // Arrange
+            var sut = new HandlebarsContextFactory(_fileSystemHandlerMock.Object, null);
+
+            // Act
+            var result = sut.Create();
+
+            // Assert
+            result.Should().NotBeNull();
+        }
+
+        [Fact]
+        public void Create_WithAction_InvokesAction()
+        {
+            // Arrange
+            int num = 0;
+            Action<IHandlebars, IFileSystemHandler> action = (ctx, fs) =>
+            {
+                ctx.Should().NotBeNull();
+                fs.Should().NotBeNull();
+
+                num++;
+            };
+            var sut = new HandlebarsContextFactory(_fileSystemHandlerMock.Object, action);
+
+            // Act
+            var result = sut.Create();
+
+            // Assert
+            result.Should().NotBeNull();
+
+            // Verify
+            num.Should().Be(1);
+        }
+    }
+}
--- a/test/WireMock.Net.Tests/Util/FileHelperTests.cs
+++ b/test/WireMock.Net.Tests/Util/FileHelperTests.cs
@@ -1,7 +1,6 @@
-using System;
-using System.IO;
+using FluentAssertions;
 using Moq;
-using NFluent;
+using System;
 using WireMock.Handlers;
 using WireMock.Util;
 using Xunit;
@@ -11,31 +10,36 @@ namespace WireMock.Net.Tests.Util
    public class FileHelperTests
    {
        [Fact]
-        public void FileHelper_ReadAllTextWithRetryAndDelay()
+        public void TryReadMappingFileWithRetryAndDelay_WithIFileSystemHandlerOk_ReturnsTrue()
        {
            // Assign
            var staticMappingHandlerMock = new Mock<IFileSystemHandler>();
            staticMappingHandlerMock.Setup(m => m.ReadMappingFile(It.IsAny<string>())).Returns("text");

            // Act
-            string result = FileHelper.ReadAllTextWithRetryAndDelay(staticMappingHandlerMock.Object, @"c:\temp");
+            bool result = FileHelper.TryReadMappingFileWithRetryAndDelay(staticMappingHandlerMock.Object, @"c:\temp", out string value);

            // Assert
-            Check.That(result).Equals("text");
+            result.Should().BeTrue();
+            value.Should().Be("text");

            // Verify
            staticMappingHandlerMock.Verify(m => m.ReadMappingFile(@"c:\temp"), Times.Once);
        }

        [Fact]
-        public void FileHelper_ReadAllTextWithRetryAndDelay_Throws()
+        public void TryReadMappingFileWithRetryAndDelay_WithIFileSystemHandlerThrows_ReturnsFalse()
        {
            // Assign
            var staticMappingHandlerMock = new Mock<IFileSystemHandler>();
            staticMappingHandlerMock.Setup(m => m.ReadMappingFile(It.IsAny<string>())).Throws<NotSupportedException>();

            // Act
-            Check.ThatCode(() => FileHelper.ReadAllTextWithRetryAndDelay(staticMappingHandlerMock.Object, @"c:\temp")).Throws<IOException>();
+            bool result = FileHelper.TryReadMappingFileWithRetryAndDelay(staticMappingHandlerMock.Object, @"c:\temp", out string value);
+
+            // Assert
+            result.Should().BeFalse();
+            value.Should().BeNull();

            // Verify
            staticMappingHandlerMock.Verify(m => m.ReadMappingFile(@"c:\temp"), Times.Exactly(3));