Adds docker container restart command

Author: Ryan Moran

docker.go

@@ -18,8 +18,9 @@ type Docker struct {
 	Container struct {
 		Inspect DockerContainerInspect
 		Logs    DockerContainerLogs
-		Run     DockerContainerRun
 		Remove  DockerContainerRemove
+		Restart DockerContainerRestart
+		Run     DockerContainerRun
 		Stop    DockerContainerStop
 	}
 
@@ -45,6 +46,7 @@ func NewDocker() Docker {
 	}
 
 	docker.Container.Remove = DockerContainerRemove{executable: executable}
+	docker.Container.Restart = DockerContainerRestart{executable: executable}
 	docker.Container.Stop = DockerContainerStop{executable: executable}
 
 	docker.Volume.Remove = DockerVolumeRemove{executable: executable}
@@ -60,6 +62,7 @@ func (d Docker) WithExecutable(executable Executable) Docker {
 
 	d.Container.Inspect.executable = executable
 	d.Container.Logs.executable = executable
+	d.Container.Restart.executable = executable
 	d.Container.Remove.executable = executable
 	d.Container.Run.executable = executable
 	d.Container.Run.inspect = d.Container.Inspect
@@ -277,6 +280,23 @@ func (r DockerContainerRun) Execute(imageID string) (Container, error) {
 	return r.inspect.Execute(strings.TrimSpace(stdout.String()))
 }
 
+type DockerContainerRestart struct {
+	executable Executable
+}
+
+func (r DockerContainerRestart) Execute(containerID string) error {
+	stderr := bytes.NewBuffer(nil)
+	err := r.executable.Execute(pexec.Execution{
+		Args:   []string{"container", "restart", containerID},
+		Stderr: stderr,
+	})
+	if err != nil {
+		return fmt.Errorf("failed to restart docker container: %w: %s", err, strings.TrimSpace(stderr.String()))
+	}
+
+	return nil
+}
+
 type DockerContainerRemove struct {
 	executable Executable
 }

docker_test.go

@@ -620,6 +620,33 @@ func testDocker(t *testing.T, context spec.G, it spec.S) {
 			})
 		})
 
+		context("Restart", func() {
+			it("restarts a docker container with the given container id", func() {
+				err := docker.Container.Restart.Execute("some-container-id")
+				Expect(err).NotTo(HaveOccurred())
+
+				Expect(executable.ExecuteCall.Receives.Execution.Args).To(Equal([]string{
+					"container", "restart", "some-container-id",
+				}))
+			})
+
+			context("failure cases", func() {
+				context("when the executable fails", func() {
+					it.Before(func() {
+						executable.ExecuteCall.Stub = func(execution pexec.Execution) error {
+							fmt.Fprintln(execution.Stderr, "Error: No such container: some-container-id")
+							return errors.New("exit status 1")
+						}
+					})
+
+					it("returns an error", func() {
+						err := docker.Container.Restart.Execute("some-container-id")
+						Expect(err).To(MatchError("failed to restart docker container: exit status 1: Error: No such container: some-container-id"))
+					})
+				})
+			})
+		})
+
 		context("Remove", func() {
 			it("removes a docker container with the given container id", func() {
 				err := docker.Container.Remove.Execute("some-container-id")