cli: Ensure JSON flag is respected in autopilot health command. (#24655)

.changelog/24655.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+cli: Ensure the `operator autopilot health` command only outputs JSON when the `json` flag is supplied
+```

command/operator_autopilot_health.go

@@ -59,9 +59,9 @@ func (c *OperatorAutopilotHealthCommand) Run(args []string) int {
 			return 1
 		}
 		c.Ui.Output(string(bytes))
-	}
-
+	} else {
 		c.Ui.Output(formatAutopilotState(state))
+	}
 
 	return 0
 }

command/operator_autopilot_health_test.go

@@ -4,8 +4,10 @@
 package command
 
 import (
+	"encoding/json"
 	"testing"
 
+	"github.com/hashicorp/nomad/api"
 	"github.com/hashicorp/nomad/ci"
 	"github.com/mitchellh/cli"
 	"github.com/shoenig/test/must"
@@ -31,3 +33,24 @@ func TestOperatorAutopilotStateCommand(t *testing.T) {
 	out := ui.OutputWriter.String()
 	must.StrContains(t, out, "Healthy")
 }
+
+func TestOperatorAutopilotStateCommand_JSON(t *testing.T) {
+	ci.Parallel(t)
+	s, _, addr := testServer(t, false, nil)
+	defer s.Shutdown()
+
+	ui := cli.NewMockUi()
+	c := &OperatorAutopilotHealthCommand{Meta: Meta{Ui: ui}}
+	args := []string{"-address=" + addr, "-json"}
+
+	code := c.Run(args)
+	must.Eq(t, 0, code, must.Sprintf("got error for exit code: %v", ui.ErrorWriter.String()))
+
+	// Attempt to unmarshal the data which tests that the output is JSON and
+	// peak into the data, checking that healthy is an expected and no-default
+	// value.
+	operatorHealthyReply := api.OperatorHealthReply{}
+
+	must.NoError(t, json.Unmarshal(ui.OutputWriter.Bytes(), &operatorHealthyReply))
+	must.True(t, operatorHealthyReply.Healthy)
+}