chore(test): add backwards-compatibility tests for region warning

Author: rektdeckard

cmd/lk/agent.go

@@ -1967,7 +1967,7 @@ func resolveRegion(cmd *cli.Command, settingsMap map[string]string, title string
 	for _, r := range regionOptions {
 		label := r
 		if slices.Contains(warnRegions, r) {
-			label = r + " " + util.Dimmed("⚠︎ GDPR compliance required")
+			label = r + " " + util.Warn("⚠︎ GDPR compliance required")
 		}
 		options = append(options, huh.NewOption(label, r))
 	}

cmd/lk/agent_test.go

@@ -602,3 +602,31 @@ func TestResolveAttributes(t *testing.T) {
 		})
 	}
 }
+
+// An older server sends neither residency_warning_regions nor project_data_region.
+// The advisory must then be inert rather than erroring or prompting, so a new CLI
+// keeps working against a server that predates it.
+func TestConfirmRegionResidencyWithoutServerSettings(t *testing.T) {
+	settingsMap := map[string]string{"available_regions": "us-east,eu-central"}
+	warnRegions := splitSetting(settingsMap["residency_warning_regions"])
+	require.Empty(t, warnRegions)
+
+	err := confirmRegionResidency(&cli.Command{}, "eu-central",
+		settingsMap["project_data_region"], warnRegions)
+	require.NoError(t, err)
+}
+
+// An EU project gets the param with an empty value; it must behave like absent.
+func TestConfirmRegionResidencyWithEmptyWarningRegions(t *testing.T) {
+	warnRegions := splitSetting("")
+	require.Empty(t, warnRegions)
+	require.NoError(t, confirmRegionResidency(&cli.Command{}, "eu-central", "eu", warnRegions))
+}
+
+// A flagged region without a TTY (or with --yes) warns and proceeds rather than
+// blocking, so existing automation deploying into the EU keeps working.
+func TestConfirmRegionResidencyProceedsWhenPromptsSkipped(t *testing.T) {
+	warnRegions := splitSetting("eu-central")
+	require.Equal(t, []string{"eu-central"}, warnRegions)
+	require.NoError(t, confirmRegionResidency(&cli.Command{}, "eu-central", "us", warnRegions))
+}

pkg/util/theme.go

@@ -177,6 +177,16 @@ func Dimmed(text string) string {
 	return Theme.Focused.Description.Render(text)
 }
 
+// Warn renders text in the active theme's Warning style
+func Warn(text string) string {
+	return lipgloss.NewStyle().Foreground(activePalette.Warning).Render(text)
+}
+
+// Warn renders text in the active theme's Error style
+func Err(text string) string {
+	return lipgloss.NewStyle().Foreground(activePalette.Error).Render(text)
+}
+
 // Hyperlink wraps label in an OSC 8 terminal hyperlink pointing at url. Terminals
 // that support OSC 8 render label as a clickable link; others ignore the escape
 // and show label unchanged. Gate calls on an interactive terminal (see