Add unit test for workflow

cmd/workflow/testdata/TestWorkflowGoldenOutput/workflow.golden

@@ -0,0 +1,22 @@
+Access to argo workflows
+
+Usage:
+  airshipctl workflow [command]
+
+Aliases:
+  workflow, workflows, wf
+
+Available Commands:
+  init        bootstraps the kubernetes cluster with the Workflow CRDs and controller
+  list        list workflows
+
+Flags:
+      --all-namespaces      use all kubernetes namespaces for the context of this command
+  -h, --help                help for workflow
+      --kubeconfig string   path to kubeconfig
+      --namespace string    kubernetes namespace to use for the context of this command (default "default")
+
+Global Flags:
+      --debug   enable verbose output
+
+Use "airshipctl workflow [command] --help" for more information about a command.

cmd/workflow/workflow_test.go

@@ -1,8 +1,13 @@
 package workflow_test
 
 import (
+	"testing"
+
 	"k8s.io/apimachinery/pkg/runtime"
 
+	"github.com/ian-howell/airshipctl/cmd"
+	"github.com/ian-howell/airshipctl/cmd/workflow"
+	wfenv "github.com/ian-howell/airshipctl/pkg/workflow/environment"
 	"github.com/ian-howell/airshipctl/test"
 )
 
@@ -12,3 +17,28 @@ type WorkflowCmdTest struct {
 	CRDObjs  []runtime.Object
 	ArgoObjs []runtime.Object
 }
+
+func TestWorkflow(t *testing.T) {
+	rootCmd, settings, err := cmd.NewRootCmd(nil)
+	if err != nil {
+		t.Fatalf("Could not create root command: %s", err.Error())
+	}
+	workflowRoot := workflow.NewWorkflowCommand(settings)
+	rootCmd.AddCommand(workflowRoot)
+
+	cmdTests := []WorkflowCmdTest{
+		{
+			CmdTest: &test.CmdTest{
+				Name:    "workflow",
+				CmdLine: "workflow",
+			},
+		},
+	}
+
+	for _, tt := range cmdTests {
+		settings.PluginSettings[workflow.PluginSettingsID] = &wfenv.Settings{
+			Initialized: true,
+		}
+		test.RunTest(t, tt.CmdTest, rootCmd)
+	}
+}