Add TestBrowserContextDefaultOptions

browser/browser_context_options_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 
 	"github.com/grafana/xk6-browser/common"
 	"github.com/grafana/xk6-browser/k6ext/k6test"
@@ -40,3 +41,24 @@ func TestBrowserContextSetGeolocation(t *testing.T) {
 	assert.Equal(t, 2.0, opts.Geolocation.Longitude)
 	assert.Equal(t, 3.0, opts.Geolocation.Accuracy)
 }
+
+func TestBrowserContextDefaultOptions(t *testing.T) {
+	vu := k6test.NewVU(t)
+
+	defaults := common.NewBrowserContextOptions()
+
+	// gets the default options by default
+	opts, err := parseBrowserContextOptions(vu.Runtime(), nil)
+	require.NoError(t, err)
+	assert.Equal(t, defaults, opts)
+
+	// merges with the default options
+	opts, err = parseBrowserContextOptions(vu.Runtime(), vu.ToSobekValue((struct {
+		DeviceScaleFactor float64 `js:"deviceScaleFactor"` // just to test a different field
+	}{
+		DeviceScaleFactor: defaults.DeviceScaleFactor + 1,
+	})))
+	require.NoError(t, err)
+	assert.NotEqual(t, defaults.DeviceScaleFactor, opts.DeviceScaleFactor)
+	assert.Equal(t, defaults.Locale, opts.Locale) // should remain as default
+}