diff --git a/test/intl402/ListFormat/constructor/constructor/options-style-valid.js b/test/intl402/ListFormat/constructor/constructor/options-style-valid.js
index ba699978ea0678a9d29b6b3d249ac34652974def..01d1cd8ee6f91e17f13028be9816efe9af3281ef 100644
--- a/test/intl402/ListFormat/constructor/constructor/options-style-valid.js
+++ b/test/intl402/ListFormat/constructor/constructor/options-style-valid.js
@@ -8,6 +8,7 @@ info: |
     InitializeListFormat (listFormat, locales, options)
     9. Let s be ? GetOption(options, "style", "string", «"long", "short", "narrow"», "long").
     10. Set listFormat.[[Style]] to s.
+    14. If style is "narrow" and type is not "unit", throw a RangeError exception.
 features: [Intl.ListFormat]
 ---*/
 
@@ -15,8 +16,7 @@ const validOptions = [
   [undefined, "long"],
   ["long", "long"],
   ["short", "short"],
-  ["narrow", "narrow"],
-  [{ toString() { return "narrow"; } }, "narrow"],
+  [{ toString() { return "short"; } }, "short"],
 ];
 
 for (const [validOption, expected] of validOptions) {
@@ -24,3 +24,11 @@ for (const [validOption, expected] of validOptions) {
   const resolvedOptions = lf.resolvedOptions();
   assert.sameValue(resolvedOptions.style, expected);
 }
+
+const lf = new Intl.ListFormat([], {"style": "narrow", "type": "unit"});
+const resolvedOptions = lf.resolvedOptions();
+assert.sameValue(resolvedOptions.style, "narrow");
+
+assert.throws(RangeError, () => lf = new Intl.ListFormat([], {"style": "narrow"}));
+assert.throws(RangeError, () => lf = new Intl.ListFormat([], {"style": "narrow", "type": "conjuction"}));
+assert.throws(RangeError, () => lf = new Intl.ListFormat([], {"style": "narrow", "type": "disjuction"}));
diff --git a/test/intl402/ListFormat/prototype/format/en-us-narrow.js b/test/intl402/ListFormat/prototype/format/en-us-narrow.js
index 17a6bba49c002ac31409cc8df613062bbd23b6c2..dbe6792d6a56a29825b33e85c8dcbfa8c55f9677 100644
--- a/test/intl402/ListFormat/prototype/format/en-us-narrow.js
+++ b/test/intl402/ListFormat/prototype/format/en-us-narrow.js
@@ -38,6 +38,7 @@ const transforms = [
 
 const lf = new Intl.ListFormat("en-US", {
   "style": "narrow",
+  "type": "unit",
 });
 
 assert.sameValue(typeof lf.format, "function", "format should be supported");
@@ -45,9 +46,9 @@ assert.sameValue(typeof lf.format, "function", "format should be supported");
 for (const f of transforms) {
   assert.sameValue(lf.format(f([])), "");
   assert.sameValue(lf.format(f(["foo"])), "foo");
-  assert.sameValue(lf.format(f(["foo", "bar"])), "foo and bar");
-  assert.sameValue(lf.format(f(["foo", "bar", "baz"])), "foo, bar, and baz");
-  assert.sameValue(lf.format(f(["foo", "bar", "baz", "quux"])), "foo, bar, baz, and quux");
+  assert.sameValue(lf.format(f(["foo", "bar"])), "foo bar");
+  assert.sameValue(lf.format(f(["foo", "bar", "baz"])), "foo bar baz");
+  assert.sameValue(lf.format(f(["foo", "bar", "baz", "quux"])), "foo bar baz quux");
 }
 
-assert.sameValue(lf.format("foo"), "f, o, and o");
+assert.sameValue(lf.format("foo"), "f o o");
diff --git a/test/intl402/ListFormat/prototype/formatToParts/en-us-narrow.js b/test/intl402/ListFormat/prototype/formatToParts/en-us-narrow.js
index 891c8fb372b65983dd025d536941e13c6d30ee3b..6d4e7c16e8f3cb8e4d6c9ba034c25c898891de44 100644
--- a/test/intl402/ListFormat/prototype/formatToParts/en-us-narrow.js
+++ b/test/intl402/ListFormat/prototype/formatToParts/en-us-narrow.js
@@ -47,6 +47,7 @@ const transforms = [
 
 const lf = new Intl.ListFormat("en-US", {
   "style": "narrow",
+  "type": "unit",
 });
 
 assert.sameValue(typeof lf.formatToParts, "function", "formatToParts should be supported");
@@ -58,31 +59,31 @@ for (const f of transforms) {
   ]);
   verifyFormatParts(lf.formatToParts(f(["foo", "bar"])), [
     { "type": "element", "value": "foo" },
-    { "type": "literal", "value": " and " },
+    { "type": "literal", "value": " " },
     { "type": "element", "value": "bar" },
   ]);
   verifyFormatParts(lf.formatToParts(f(["foo", "bar", "baz"])), [
     { "type": "element", "value": "foo" },
-    { "type": "literal", "value": ", " },
+    { "type": "literal", "value": " " },
     { "type": "element", "value": "bar" },
-    { "type": "literal", "value": ", and " },
+    { "type": "literal", "value": " " },
     { "type": "element", "value": "baz" },
   ]);
   verifyFormatParts(lf.formatToParts(f(["foo", "bar", "baz", "quux"])), [
     { "type": "element", "value": "foo" },
-    { "type": "literal", "value": ", " },
+    { "type": "literal", "value": " " },
     { "type": "element", "value": "bar" },
-    { "type": "literal", "value": ", " },
+    { "type": "literal", "value": " " },
     { "type": "element", "value": "baz" },
-    { "type": "literal", "value": ", and " },
+    { "type": "literal", "value": " " },
     { "type": "element", "value": "quux" },
   ]);
 }
 
 verifyFormatParts(lf.formatToParts("foo"), [
   { "type": "element", "value": "f" },
-  { "type": "literal", "value": ", " },
+  { "type": "literal", "value": " " },
   { "type": "element", "value": "o" },
-  { "type": "literal", "value": ", and " },
+  { "type": "literal", "value": " " },
   { "type": "element", "value": "o" },
 ]);