WireMock.Net/test/WireMock.Net.Tests/ResponseBuilders/ResponseWithHandlebarsFileTests.cs

using System.Threading.Tasks;
using HandlebarsDotNet;
using Moq;
using Newtonsoft.Json.Linq;
using NFluent;
using WireMock.Handlers;
using WireMock.Models;
using WireMock.ResponseBuilders;
using WireMock.Settings;
using Xunit;

namespace WireMock.Net.Tests.ResponseBuilders;

public class ResponseWithHandlebarsFileTests
{
    private readonly WireMockServerSettings _settings = new();
    private const string ClientIp = "::1";

    private readonly Mock<IMapping> _mappingMock;
    private readonly Mock<IFileSystemHandler> _filesystemHandlerMock;

    public ResponseWithHandlebarsFileTests()
    {
        _mappingMock = new Mock<IMapping>();

        _filesystemHandlerMock = new Mock<IFileSystemHandler>(MockBehavior.Strict);
        _filesystemHandlerMock.Setup(fs => fs.ReadResponseBodyAsString(It.IsAny<string>())).Returns("abc");

        _settings.FileSystemHandler = _filesystemHandlerMock.Object;
    }

    [Fact]
    public async Task Response_ProvideResponseAsync_Handlebars_File()
    {
        // Assign
        var request = new RequestMessage(new UrlDetails("http://localhost:1234"), "GET", ClientIp);

        var responseBuilder = Response.Create()
            .WithBodyAsJson(new
            {
                Data = "{{File \"x.json\"}}"
            })
            .WithTransformer();

        // Act
        var response = await responseBuilder.ProvideResponseAsync(_mappingMock.Object, request, _settings).ConfigureAwait(false);

        // Assert
        JObject j = JObject.FromObject(response.Message.BodyData.BodyAsJson);
        Check.That(j["Data"].Value<string>()).Equals("abc");

        // Verify
        _filesystemHandlerMock.Verify(fs => fs.ReadResponseBodyAsString("x.json"), Times.Once);
        _filesystemHandlerMock.VerifyNoOtherCalls();
    }

    [Fact]
    public async Task Response_ProvideResponseAsync_Handlebars_File_Replace()
    {
        // Assign
        var request = new RequestMessage(new UrlDetails("http://localhost:1234?id=x"), "GET", ClientIp);

        var responseBuilder = Response.Create()
            .WithBodyAsJson(new
            {
                Data = "{{File \"{{request.query.id}}.json\"}}"
            })
            .WithTransformer();

        // Act
        var response = await responseBuilder.ProvideResponseAsync(_mappingMock.Object, request, _settings).ConfigureAwait(false);

        // Assert
        JObject j = JObject.FromObject(response.Message.BodyData.BodyAsJson);
        Check.That(j["Data"].Value<string>()).Equals("abc");

        // Verify
        _filesystemHandlerMock.Verify(fs => fs.ReadResponseBodyAsString("x.json"), Times.Once);
        _filesystemHandlerMock.VerifyNoOtherCalls();
    }

    [Fact]
    public void Response_ProvideResponseAsync_Handlebars_File_WithMissingArgument_Throws_HandlebarsException()
    {
        // Assign
        var request = new RequestMessage(new UrlDetails("http://localhost:1234"), "GET", ClientIp);

        var responseBuilder = Response.Create()
            .WithBodyAsJson(new
            {
                Data = "{{File}}"
            })
            .WithTransformer();

        // Act
        Check.ThatAsyncCode(() => responseBuilder.ProvideResponseAsync(_mappingMock.Object, request, _settings)).Throws<HandlebarsException>();

        // Verify
        _filesystemHandlerMock.Verify(fs => fs.ReadResponseBodyAsString(It.IsAny<string>()), Times.Never);
        _filesystemHandlerMock.VerifyNoOtherCalls();
    }
}