[AIR-97] Adding base airshipctl cluster command

New subcommands will be added later, this commit is a simple base
for other commits related to airshipctl cluster command

Change-Id: I77057c291b88bae3b8fca08ddf56bdf6d183fd24

cmd/cluster/cluster.go

@@ -0,0 +1,24 @@
+package cluster
+
+import (
+	"github.com/spf13/cobra"
+
+	"opendev.org/airship/airshipctl/pkg/environment"
+)
+
+var (
+	// ClusterUse subcommand string
+	ClusterUse = "cluster"
+)
+
+// NewClusterCommand returns cobra command object of the airshipctl cluster and adds it's subcommands.
+func NewClusterCommand(rootSettings *environment.AirshipCTLSettings) *cobra.Command {
+	clusterRootCmd := &cobra.Command{
+		Use: ClusterUse,
+		// TODO: (kkalynovskyi) Add more description when more subcommands are added
+		Short: "Control kubernetes cluster",
+		Long:  "Interactions with kubernetes cluster, such as get status, deploy initial infrastructure",
+	}
+
+	return clusterRootCmd
+}

cmd/cluster/cluster_test.go

@@ -0,0 +1,21 @@
+package cluster_test
+
+import (
+	"testing"
+
+	"opendev.org/airship/airshipctl/cmd/cluster"
+	"opendev.org/airship/airshipctl/testutil"
+)
+
+func TestNewClusterCommandReturn(t *testing.T) {
+	tests := []*testutil.CmdTest{
+		{
+			Name:    "cluster-cmd-with-defaults",
+			CmdLine: "",
+			Cmd:     cluster.NewClusterCommand(nil),
+		},
+	}
+	for _, testcase := range tests {
+		testutil.RunTest(t, testcase)
+	}
+}

cmd/cluster/testdata/TestNewClusterCommandReturnGoldenOutput/cluster-cmd-with-defaults.golden

@@ -0,0 +1,2 @@
+Interactions with kubernetes cluster, such as get status, deploy initial infrastructure
+

cmd/root.go

@@ -13,6 +13,7 @@ import (
 	_ "k8s.io/client-go/plugin/pkg/client/auth"
 
 	"opendev.org/airship/airshipctl/cmd/bootstrap"
+	"opendev.org/airship/airshipctl/cmd/cluster"
 	"opendev.org/airship/airshipctl/cmd/completion"
 	"opendev.org/airship/airshipctl/cmd/document"
 	"opendev.org/airship/airshipctl/pkg/environment"
@@ -51,6 +52,7 @@ func NewRootCmd(out io.Writer) (*cobra.Command, *environment.AirshipCTLSettings,
 func AddDefaultAirshipCTLCommands(cmd *cobra.Command, settings *environment.AirshipCTLSettings) *cobra.Command {
 	cmd.AddCommand(argo.NewCommand())
 	cmd.AddCommand(bootstrap.NewBootstrapCommand(settings))
+	cmd.AddCommand(cluster.NewClusterCommand(settings))
 	cmd.AddCommand(completion.NewCompletionCommand())
 	cmd.AddCommand(document.NewDocumentCommand(settings))
 	cmd.AddCommand(kubectl.NewDefaultKubectlCommand())

cmd/testdata/TestRootGoldenOutput/rootCmd-with-defaults.golden

@@ -17,4 +17,7 @@ Flags:
       --debug   enable verbose output
   -h, --help    help for airshipctl
 
+Additional help topics:
+  airshipctl cluster    Control kubernetes cluster
+
 Use "airshipctl [command] --help" for more information about a command.