package main import ( "strings" "testing" ) func TestCmdDaemon(t *testing.T) { proxy := NewDaemonProxy() err := proxy.CmdDaemon("--help") if err == nil { t.Fatal("Expected CmdDaemon to fail in Windows.") } if !strings.Contains(err.Error(), "Please run `dockerd`") { t.Fatalf("Expected an error about running dockerd, got %s", err) } }