Add a test to ensure that module can be disabled

Author: ankur22

browser/module_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/dop251/goja"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
 	"github.com/grafana/xk6-browser/chromium"
@@ -32,3 +33,15 @@ func TestModuleNew(t *testing.T) {
 	require.NotNil(t, m.mod.Devices, "Devices should be set")
 	require.Equal(t, m.mod.Version, version, "Incorrect version")
 }
+
+func TestModuleNewDisabled(t *testing.T) {
+	t.Setenv("K6_BROWSER_DISABLE_RUN", "")
+
+	vu := &k6modulestest.VU{
+		RuntimeField: goja.New(),
+		InitEnvField: &k6common.InitEnvironment{
+			Registry: k6metrics.NewRegistry(),
+		},
+	}
+	assert.Panics(t, func() { New().NewModuleInstance(vu) })
+}