src: make --icu-data-dir= switch testable

Move some code around so we can properly test whether the switch
actually does anything.

PR-URL: https://github.com/nodejs/node/pull/11255
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/test/parallel/test-intl-no-icu-data.js b/test/parallel/test-intl-no-icu-data.js
new file mode 100644
index 0000000000..dd14c14671
--- /dev/null
+++ b/test/parallel/test-intl-no-icu-data.js
@@ -0,0 +1,7 @@
+// Flags: --icu-data-dir=test/fixtures/empty/
+'use strict';
+require('../common');
+const assert = require('assert');
+
+// No-op when ICU case mappings are unavailable.
+assert.strictEqual('ç'.toLocaleUpperCase('el'), 'ç');