01_hello

Hello, world!

The test in hello_test.go examines the HELLO environment variable to see if it contains the string world.

The test will fail outside the Docker Compose app if the HELLO environment variable is not set.

$ go test
--- FAIL: TestHello (0.00s)
    hello_test.go:17: HELLO had value ""
FAIL
exit status 1
FAIL    .../github.com/bloomberg/docket/testdata/01_hello    0.006s

If we set HELLO=world, then the test passes.

$ HELLO=world go test
PASS
ok      .../github.com/bloomberg/docket/testdata/01_hello    0.006s

The test will pass when run with docket, since docket.yaml sets HELLO=world in the tester service's environment.

$ DOCKET_MODE=1 DOCKET_DOWN=1 go test
[docket] config [docker-compose --file docket.yaml config]
[docket] up [docker-compose --file docket.yaml --file docket-source-mounts.762772584.yaml up -d]
Creating network "01_hello_default" with the default driver
Creating 01_hello_tester_1 ... done
[docket] up finished
[docket] exec [docker-compose --file docket.yaml --file docket-source-mounts.762772584.yaml exec -T tester go test github.com/bloomberg/docket/testdata/01_hello -run ^TestHello$ -count=1]
ok  	github.com/bloomberg/docket/testdata/01_hello	0.003s
[docket] exec finished
[docket] down [docker-compose --file docket.yaml --file docket-source-mounts.762772584.yaml down]
Stopping 01_hello_tester_1 ... done
Removing 01_hello_tester_1 ... done
Removing network 01_hello_default
[docket] down finished
PASS
ok  	.../github.com/bloomberg/docket/testdata/01_hello	5.189s

For more details about how this works and what DOCKER_MODE is, see the next example in 02_ping-redis.