test: fix test-readline-position w/o ICU

PR-URL: #14489
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>

test/parallel/test-readline-position.js

@@ -14,16 +14,26 @@ const ctrlU = { ctrl: true, name: 'u' };
     prompt: ''
   });
 
-  for (const [cursor, string] of [
+  const tests = [
     [1, 'a'],
     [2, 'ab'],
-    [2, '丁'],
-    [0, '\u0301'],   // COMBINING ACUTE ACCENT
-    [1, 'a\u0301'],  // á
-    [0, '\u20DD'],   // COMBINING ENCLOSING CIRCLE
-    [2, 'a\u20DDb'], // a⃝b
-    [0, '\u200E']    // LEFT-TO-RIGHT MARK
-  ]) {
+    [2, '丁']
+  ];
+
+  // The non-ICU JS implementation of character width calculation is only aware
+  // of the wide/narrow distinction. Only test these more advanced cases when
+  // ICU is available.
+  if (process.binding('config').hasIntl) {
+    tests.push(
+      [0, '\u0301'],   // COMBINING ACUTE ACCENT
+      [1, 'a\u0301'],  // á
+      [0, '\u20DD'],   // COMBINING ENCLOSING CIRCLE
+      [2, 'a\u20DDb'], // a⃝b
+      [0, '\u200E']    // LEFT-TO-RIGHT MARK
+    );
+  }
+
+  for (const [cursor, string] of tests) {
     rl.write(string);
     assert.strictEqual(rl._getCursorPos().cols, cursor);
     rl.write(null, ctrlU);