feat(cli): add hidden netcheck command (#8136)

cli/netcheck_test.go

@@ -0,0 +1,34 @@
+package cli_test
+
+import (
+	"bytes"
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/coder/coder/cli/clitest"
+	"github.com/coder/coder/coderd/healthcheck"
+	"github.com/coder/coder/pty/ptytest"
+)
+
+func TestNetcheck(t *testing.T) {
+	t.Parallel()
+
+	pty := ptytest.New(t)
+	config := login(t, pty)
+
+	var out bytes.Buffer
+	inv, _ := clitest.New(t, "netcheck", "--global-config", string(config))
+	inv.Stdout = &out
+
+	clitest.StartWithWaiter(t, inv).RequireSuccess()
+
+	var report healthcheck.DERPReport
+	require.NoError(t, json.Unmarshal(out.Bytes(), &report))
+
+	assert.True(t, report.Healthy)
+	require.Len(t, report.Regions, 1)
+	require.Len(t, report.Regions[1].NodeReports, 1)
+}