Improve test removing sleep

Signed-off-by: Federico Guerinoni <guerra@develer.com>

Author: Federico Guerinoni

go.mod

@@ -4,17 +4,14 @@ go 1.14
 
 require (
 	github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 // indirect
-	github.com/Microsoft/go-winio v0.4.10 // indirect
 	github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5 // indirect
 	github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6 // indirect
 	github.com/arduino/go-apt-client v0.0.0-20180125162211-1e18c69bac9f
 	github.com/arduino/go-system-stats v0.0.0-20180215112344-1598cba505aa
 	github.com/arduino/gonetworkmanager v0.0.0-20180822160505-c0a58e05a154 // indirect
 	github.com/blang/semver v3.5.1+incompatible
-	github.com/containerd/continuity v0.0.0-20181003075958-be9bd761db19 // indirect
 	github.com/docker/cli v0.0.0-20180905184309-44371c7c34d5
-	github.com/docker/distribution v2.6.0-rc.1.0.20180327202408-83389a148052+incompatible // indirect
-	github.com/docker/docker v17.12.0-ce-rc1.0.20180822115147-a0385f7ad7f8+incompatible
+	github.com/docker/docker v17.12.0-ce-rc1.0.20200916142827-bd33bbf0497b+incompatible
 	github.com/docker/docker-credential-helpers v0.6.1 // indirect
 	github.com/docker/go-connections v0.4.0 // indirect
 	github.com/docker/go-metrics v0.0.0-20180209012529-399ea8c73916 // indirect
@@ -40,12 +37,13 @@ require (
 	github.com/opencontainers/go-digest v1.0.0-rc1 // indirect
 	github.com/opencontainers/image-spec v1.0.1 // indirect
 	github.com/opencontainers/runc v0.1.1 // indirect
-	github.com/pkg/errors v0.8.1
+	github.com/pkg/errors v0.9.1
 	github.com/satori/go.uuid v1.2.0 // indirect
 	github.com/shirou/gopsutil v2.17.13-0.20180801053943-8048a2e9c577+incompatible
 	github.com/shirou/w32 v0.0.0-20160930032740-bb4de0191aa4 // indirect
 	github.com/spf13/viper v1.7.1
-	github.com/stretchr/testify v1.3.0
+	github.com/stretchr/testify v1.6.1
+	github.com/testcontainers/testcontainers-go v0.9.0
 	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
 	golang.org/x/net v0.0.0-20200707034311-ab3426394381
 	golang.org/x/time v0.0.0-20200416051211-89c76fbcd5d1 // indirect