コンテナーでの Go 言語テストの実行
Prerequisites
Complete the Build your Go image section of this guide.
Overview
Testing is an essential part of modern software development. Testing can mean a lot of things to different development teams. There are unit tests, integration tests and end-to-end testing. In this guide you take a look at running your unit tests in Docker when building.
For this section, use the docker-gs-ping project that you cloned in
Build
your Go image.
Run tests when building
To run your tests when building, you need to add a test stage to the
Dockerfile.multistage. The Dockerfile.multistage in the sample application's
repository already has the following content:
# syntax=docker/dockerfile:1
# Build the application from source
FROM golang:1.19 AS build-stage
WORKDIR /app
COPY go.mod go.sum ./
RUN go mod download
COPY *.go ./
RUN CGO_ENABLED=0 GOOS=linux go build -o /docker-gs-ping
# Run the tests in the container
FROM build-stage AS run-test-stage
RUN go test -v ./...
# Deploy the application binary into a lean image
FROM gcr.io/distroless/base-debian11 AS build-release-stage
WORKDIR /
COPY --from=build-stage /docker-gs-ping /docker-gs-ping
EXPOSE 8080
USER nonroot:nonroot
ENTRYPOINT ["/docker-gs-ping"]Run the following command to build an image using the run-test-stage stage as the target and view the test results. Include --progress plain to view the build output, --no-cache to ensure the tests always run, and --target run-test-stage to target the test stage.
$ docker build -f Dockerfile.multistage -t docker-gs-ping-test --progress plain --no-cache --target run-test-stage .
You should see output containing the following.
#13 [run-test-stage 1/1] RUN go test -v ./...
#13 4.915 === RUN TestIntMinBasic
#13 4.915 --- PASS: TestIntMinBasic (0.00s)
#13 4.915 === RUN TestIntMinTableDriven
#13 4.915 === RUN TestIntMinTableDriven/0,1
#13 4.915 === RUN TestIntMinTableDriven/1,0
#13 4.915 === RUN TestIntMinTableDriven/2,-2
#13 4.915 === RUN TestIntMinTableDriven/0,-1
#13 4.915 === RUN TestIntMinTableDriven/-1,0
#13 4.915 --- PASS: TestIntMinTableDriven (0.00s)
#13 4.915 --- PASS: TestIntMinTableDriven/0,1 (0.00s)
#13 4.915 --- PASS: TestIntMinTableDriven/1,0 (0.00s)
#13 4.915 --- PASS: TestIntMinTableDriven/2,-2 (0.00s)
#13 4.915 --- PASS: TestIntMinTableDriven/0,-1 (0.00s)
#13 4.915 --- PASS: TestIntMinTableDriven/-1,0 (0.00s)
#13 4.915 PASSNext steps
In this section, you learned how to run tests when building your image. Next, you’ll learn how to set up a CI/CD pipeline using GitHub Actions.