test: add unit tests for root command

cmd/root/root_test.go

@@ -4,3 +4,85 @@
 // SPDX-License-Identifier: MIT
 
 package root_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/nobbs/kubectl-mapr-ticket/cmd/claim"
+	"github.com/nobbs/kubectl-mapr-ticket/cmd/common"
+	"github.com/nobbs/kubectl-mapr-ticket/cmd/inspect"
+	. "github.com/nobbs/kubectl-mapr-ticket/cmd/root"
+	"github.com/nobbs/kubectl-mapr-ticket/cmd/secret"
+	"github.com/nobbs/kubectl-mapr-ticket/cmd/version"
+	"github.com/nobbs/kubectl-mapr-ticket/cmd/volume"
+
+	"k8s.io/cli-runtime/pkg/genericclioptions"
+	"k8s.io/cli-runtime/pkg/genericiooptions"
+)
+
+func TestNewCmd(t *testing.T) {
+	t.Parallel()
+
+	t.Run("print usage information if no command is given", func(t *testing.T) {
+		t.Parallel()
+
+		// set up
+		ioStreams, _, out, errOut := genericiooptions.NewTestIOStreams()
+		flags := genericclioptions.NewConfigFlags(false)
+
+		// run the command
+		cmd := NewCmd(flags, ioStreams)
+		cmd.SetArgs([]string{})
+		err := cmd.Execute()
+
+		// check the error
+		assert.NoError(t, err)
+
+		// check the output
+		assert.NotEmpty(t, cmd.Use)
+		assert.NotEmpty(t, cmd.Long)
+
+		assert.Contains(t, out.String(), cmd.Use)
+		assert.Contains(t, out.String(), cmd.Long)
+
+		assert.Empty(t, errOut.String())
+	})
+
+	t.Run("check if all subcommands are registered", func(t *testing.T) {
+		t.Parallel()
+
+		// set up
+		ioStreams, _, _, _ := genericiooptions.NewTestIOStreams()
+		flags := genericclioptions.NewConfigFlags(false)
+
+		opts := common.NewOptions(
+			flags,
+			ioStreams,
+		)
+
+		// run the command
+		cmd := NewCmd(flags, ioStreams)
+
+		// check the subcommands
+		assert.True(t, cmd.HasSubCommands())
+
+		// check if all subcommands are registered
+		assert.ElementsMatch(t,
+			[]string{
+				claim.NewCmd(opts).Use,
+				inspect.NewCmd(opts).Use,
+				secret.NewCmd(opts).Use,
+				version.NewCmd(opts).Use,
+				volume.NewCmd(opts).Use,
+			},
+			func() (cmdCommandsUse []string) {
+				for _, c := range cmd.Commands() {
+					cmdCommandsUse = append(cmdCommandsUse, c.Use)
+				}
+				return
+			}(),
+		)
+	})
+}