Docker 编写 .Net Core NUnit 测试和 Redis

Question

我有一个包含 API 和 NUnit 测试的 .Net Core 解决方案。当我运行docker-compose up 时，如果我不包含测试，API 可以正常工作。但是，如果我实施测试，则 docker compose 无法构建，并出现错误 StackExchange.Redis.RedisConnectionException : It was not possible to connect to the redis server(s). UnableToConnect on redis-service:6379/Interactive 在命令行中。

我的Dockerfile：

FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443

FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
WORKDIR /src
COPY ["ReportApi/ReportApi.csproj", "ReportApi/"]
COPY ["ReportApi.Test/ReportApi.Test.csproj", "ReportApi.Test/"]RUN dotnet restore "ReportApi/ReportApi.csproj"
RUN dotnet restore "ReportApi.Test/ReportApi.Test.csproj"
COPY . .
WORKDIR "/src/ReportApi"
RUN dotnet build "ReportApi.csproj" -c Release -o /app/build
WORKDIR "/src/ReportApi.Test"
RUN dotnet build "ReportApi.Test.csproj" -c Release -o /app/build


FROM build AS publish
WORKDIR "/src/ReportApi"
RUN dotnet publish "ReportApi.csproj" -c Release -o /app/publish
WORKDIR "/src/ReportApi.Test"
RUN dotnet test "ReportApi.Test.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "ReportApi.dll"]

我的docker-compose.yml：

version: "3.7"
services: 
    redis-service:
        container_name: redis
        image: redis
        ports:
            - "6379:6379"
        restart: always

    report-api:
        build: 
            context: .
            dockerfile: Dockerfile
        ports: 
            - "10001:80"
        depends_on: 
            - "redis-service"

我的测试课：

namespace ReportApi.Test
{
    class RedisCacheControllerTest
    {
        public IDatabase Cache { get; set; }
        public RedisCacheController Controller { get; set; }

        [SetUp]
        public void Init()
        {

            // Set up Redis Cache
            var redis = ConnectionMultiplexer.Connect("redis-service:6379");

            var services = new ServiceCollection();
            services.AddScoped(s => redis.GetDatabase());
            var provider = services.BuildServiceProvider();
            Cache = provider.GetService<IDatabase>();

            // Create controller instance
            Controller = new RedisCacheController(Cache);

        }

        [Test]
        public void InsertRecordTest()
        {
            // Create a new instance of RedisCache
            RedisCache redisCache = new RedisCache()
            {
                id = "testId",
                value = "CacheData"
            };

            // If the redisCache object doesn't exist, check if it returns 200 OK;
            // otherwise check if it returns 409 Conflict
            if (Cache.StringGet(redisCache.id).Length() == 0)
            {
                Assert.IsInstanceOf<OkObjectResult>(Controller.Create(redisCache));
            }
            else
            {
                Assert.IsInstanceOf<ConflictObjectResult>(Controller.Create(redisCache));
            }
        }

        [Test]
        public void RetrieveRecordTest()
        {
            string key = "testId";
            // If the record exists, check if it returns 200 OK;
            // otherwise check if it returns 204 No Content
            if (Cache.StringGet(key).Length() != 0)
            {
                Assert.IsInstanceOf<OkObjectResult>(Controller.Get(key));
            }
            else
            {
                Assert.IsInstanceOf<NoContentResult>(Controller.Get(key));
            }
        }
    }
}

Answer 1

Redis 是在 docker-compose.yml 中定义的，只有在每个服务（在其中定义）都已经构建后才会运行。

因此，在构建 Dockerfile 时，还没有从 docker-compose 运行任何内容。

互联网上人们在这种情况下推荐不同的方法，例如：https://medium.com/@christiansparre/integration-testing-with-docker-compose-and-visual-studio-team-service-83a1166055a8

但是，无论如何，我建议您不要在构建 Dockerfile 时运行测试。相反，从您的 docker-compose.yml 运行它们（上面的链接）。

您当前使用的方法的目标是确保容器的映像在创建时已经过测试。但是，你没有从中获得积分。如果您的测试在镜像已经构建后失败，只需删除它并且不要使用它，如果它不起作用，没有人要求您运行保留容器。