Some test cases might need an ability to execute a command inside a
container (in order to analyse its output and/or exit code). It is a bit
complicated operation to do so using engine API. The function provided
aims to hide this complexity, making exec almost as simple as 'docker
exec'.
NOTE that the exec is synchronous, and command's stdin is closed.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Upstream-commit: 01143afe54f1be7308c5663a0cc110740626c62b
Component: engine
To help creating/running/… containers using the client for test integration.
This should make test more readable and reduce duplication a bit.
Usage example
```
// Create a default container named foo
id1 := container.Create(t, ctx, client, container.WithName("foo"))
// Run a default container with a custom command
id2 := container.Run(t, ctx, client, container.WithCmd("echo", "hello world"))
```
Signed-off-by: Vincent Demeester <vincent@sbr.pm>
Upstream-commit: 0bb7d42b03bfb125cd50ab50dabe99726e66ab71
Component: engine
