从多阶段Docker构建(.NET Core 2.0)中提取单元测试结果 [英] Extract unit test results from multi-stage Docker build (.NET Core 2.0)

问题描述

我正在构建.NET Core 2.0 Web API，并且正在创建Docker映像.我对Docker还是很陌生，所以如果之前已经回答过这个问题，我深表歉意.

I am building a .NET Core 2.0 web API and I am creating a Docker image. I am quite new to Docker so apologies if the question has been answered before.

我具有以下用于创建映像的Docker文件.特别是，我在构建过程中运行单元测试，结果输出到./test/test_results.xml(我想是在构建过程中创建的临时容器中).我的问题是，构建完成后如何访问这些测试结果?

I have the following Docker file for creating the image. In particular, I run the unit tests during the build process and the results are output to ./test/test_results.xml (in a temporary container created during the build, I guess). My question is, how do I access these test results after the build has finished?

FROM microsoft/aspnetcore-build:2.0 AS build-env

WORKDIR /app

# Copy main csproj file for DataService
COPY src/DataService.csproj ./src/
RUN dotnet restore ./src/DataService.csproj

# Copy test csproj file for DataService
COPY test/DataService.Tests.csproj ./test/
RUN dotnet restore ./test/DataService.Tests.csproj

# Copy everything else (excluding elements in dockerignore)
COPY . ./

# Run the unit tests
RUN dotnet test --results-directory ./ --logger "trx;LogFileName=test_results.xml" ./test/DataService.Tests.csproj

# Publish the app to the out directory
RUN dotnet publish ./src/DataService.csproj -c Release -o out

# Build the runtime image
FROM microsoft/aspnetcore:2.0
WORKDIR /app
EXPOSE 5001
COPY --from=build-env /app/src/out .

# Copy test results to the final image as well??
# COPY --from=build-env /app/test/test_results.xml .

ENTRYPOINT ["dotnet", "DataService.dll"]

我采用的一种方法是在# COPY --from=build-env /app/test/test_results.xml .行中进行注释.这将test_results.xml放入我的最终图像中.然后，我可以提取这些结果，并使用以下powershell脚本从最终图像中删除test_results.xml.

One approach that I have taken is to comment in the line # COPY --from=build-env /app/test/test_results.xml .. This puts the test_results.xml in my final image. I can then extract these results and remove the test_results.xml from the final image using the following powershell script.

$id=$(docker create dataservice)
docker cp ${id}:app/test_results.xml ./test/test_results.xml
docker start $id
docker exec $id rm -rf /app/test_results.xml
docker commit $id dataservice
docker rm -vf $id

但这看起来很难看，我想知道是否有一种更清洁的方法来做到这一点.

This however seems ugly and I am wondering is there a cleaner way to do it.

我希望有一种方法可以在docker build期间挂载卷，但是官方Docker似乎不支持这种方式.

I was hoping that there was a way to mount a volume during docker build but it does not appear that this is going to be supported in the official Docker.

我现在正在考虑创建一个单独的图像，仅用于单元测试.

I am looking now at creating a separate image, solely for the unit tests.

不确定是否有推荐的方式来实现我的目标.

Not sure if there is a recommended way of achieving what I want.

推荐答案

感谢您的问题-我需要解决同样的问题.

Thanks for your question - I needed to solve the same thing.

我根据构建结果添加了一个单独的容器阶段.测试及其输出均在此处进行处理，因此它们永远不会到达最终容器.因此，使用build-env进行构建，然后一个中间测试容器基于该build-env映像，而final基于运行时容器并复制了build-env的结果.

I added a separate container stage based on results of the build. The tests and its output are all handled in there so they never reach the final container. So build-env is used to build and then an intermediate test container is based on that build-env image and final is based on runtime container with results of build-env copied in.

# ---- Test ----
# run tests and capture results for later use. This use the results of the build stage
FROM build AS test
#Use label so we can later obtain this container from the multi-stage build
LABEL test=true
WORKDIR /
#Store test results in a file that we will later extract 
RUN dotnet test --results-directory ../../TestResults/ --logger "trx;LogFileName=test_results.xml" "./src/ProjectNameTests/ProjectNameTests.csproj"

下一步，我添加了一个shell脚本，然后将该图像标记为project-test.

I added a shell script as a next step that then tags the image as project-test.

#!bin/bash
id=`docker images --filter "label=test=true"  -q`
docker tag $id projectname-test:latest

在那之后，我基本上要做的就是使用docker cp并取出文件.区别在于我的测试结果永远不会出现在最终图像中，因此我不会触摸最终图像.

After that, I basically do what you do which is use docker cp and get the file out. The difference is my test results were never in the final image so I don't touch the final image.

总的来说，我认为处理测试的正确方法可能是创建一个测试映像(基于构建映像)，并以已装载的卷来运行以获取测试结果，并在该容器启动时运行单元测试.拥有合适的映像/容器还可以使您运行集成测试等.本文较旧，但详细信息类似

Overall I think the correct way to handle tests is probably create a test image (based on the build image) and run it with a mounted volume for test results and have it run the unit tests when that container starts. Having a proper image/container would also allow you to run integration tests etc. This article is older but details similar https://blogs.infosupport.com/build-deploy-test-aspnetcore-docker-linux-tfs2015/

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