diff --git a/intl/locale/tests/gtest/TestCollation.cpp b/intl/locale/tests/gtest/TestCollation.cpp
index 95f7df5d40572..4085f6433f512 100644
--- a/intl/locale/tests/gtest/TestCollation.cpp
+++ b/intl/locale/tests/gtest/TestCollation.cpp
@@ -41,3 +41,117 @@ TEST(Collation, AllocateRowSortKey)
 
   ASSERT_TRUE(result < 0);
 }
+
+class CollationComparator final {
+ public:
+  explicit CollationComparator(nsICollation* aCollation)
+      : mCollation(aCollation) {}
+
+  bool Equals(const nsString& a, const nsString& b) const {
+    int32_t result = 0;
+    mCollation->CompareString(nsICollation::kCollationStrengthDefault, a, b,
+                              &result);
+    return result == 0;
+  }
+
+  bool LessThan(const nsString& a, const nsString& b) const {
+    int32_t result = 0;
+    mCollation->CompareString(nsICollation::kCollationStrengthDefault, a, b,
+                              &result);
+    return result < 0;
+  }
+
+ private:
+  nsCOMPtr<nsICollation> mCollation;
+};
+
+TEST(Collation, CompareString)
+{
+  nsTArray<nsString> input;
+  input.AppendElement(u"Argentina"_ns);
+  input.AppendElement(u"Oerlikon"_ns);
+  input.AppendElement(u"Offenbach"_ns);
+  input.AppendElement(u"Sverige"_ns);
+  input.AppendElement(u"Vaticano"_ns);
+  input.AppendElement(u"Zimbabwe"_ns);
+  input.AppendElement(u"la France"_ns);
+  input.AppendElement(u"\u00a1viva Espa\u00f1a!"_ns);
+  input.AppendElement(u"\u00d6sterreich"_ns);
+  input.AppendElement(u"\u4e2d\u56fd"_ns);
+  input.AppendElement(u"\u65e5\u672c"_ns);
+  input.AppendElement(u"\ud55c\uad6d"_ns);
+
+  nsCOMPtr<nsICollationFactory> colFactory =
+      do_CreateInstance(NS_COLLATIONFACTORY_CONTRACTID);
+  ASSERT_TRUE(colFactory);
+
+  // Locale en-US; default options.
+  nsCOMPtr<nsICollation> collation;
+  colFactory->CreateCollationForLocale("en-US"_ns, getter_AddRefs(collation));
+  ASSERT_TRUE(collation);
+
+  {
+    CollationComparator comparator(collation);
+    input.Sort(comparator);
+
+    ASSERT_TRUE(input[0].Equals(u"\u00a1viva Espa\u00f1a!"_ns));
+    ASSERT_TRUE(input[1].Equals(u"Argentina"_ns));
+    ASSERT_TRUE(input[2].Equals(u"la France"_ns));
+    ASSERT_TRUE(input[3].Equals(u"Oerlikon"_ns));
+    ASSERT_TRUE(input[4].Equals(u"Offenbach"_ns));
+    ASSERT_TRUE(input[5].Equals(u"\u00d6sterreich"_ns));
+    ASSERT_TRUE(input[6].Equals(u"Sverige"_ns));
+    ASSERT_TRUE(input[7].Equals(u"Vaticano"_ns));
+    ASSERT_TRUE(input[8].Equals(u"Zimbabwe"_ns));
+    ASSERT_TRUE(input[9].Equals(u"\ud55c\uad6d"_ns));
+    ASSERT_TRUE(input[10].Equals(u"\u4e2d\u56fd"_ns));
+    ASSERT_TRUE(input[11].Equals(u"\u65e5\u672c"_ns));
+  }
+
+  // Locale sv-SE; default options.
+  // Swedish treats "Ö" as a separate character, which sorts after "Z".
+  colFactory->CreateCollationForLocale("sv-SE"_ns, getter_AddRefs(collation));
+  ASSERT_TRUE(collation);
+
+  {
+    CollationComparator comparator(collation);
+    input.Sort(comparator);
+
+    ASSERT_TRUE(input[0].Equals(u"\u00a1viva Espa\u00f1a!"_ns));
+    ASSERT_TRUE(input[1].Equals(u"Argentina"_ns));
+    ASSERT_TRUE(input[2].Equals(u"la France"_ns));
+    ASSERT_TRUE(input[3].Equals(u"Oerlikon"_ns));
+    ASSERT_TRUE(input[4].Equals(u"Offenbach"_ns));
+    ASSERT_TRUE(input[5].Equals(u"Sverige"_ns));
+    ASSERT_TRUE(input[6].Equals(u"Vaticano"_ns));
+    ASSERT_TRUE(input[7].Equals(u"Zimbabwe"_ns));
+    ASSERT_TRUE(input[8].Equals(u"\u00d6sterreich"_ns));
+    ASSERT_TRUE(input[9].Equals(u"\ud55c\uad6d"_ns));
+    ASSERT_TRUE(input[10].Equals(u"\u4e2d\u56fd"_ns));
+    ASSERT_TRUE(input[11].Equals(u"\u65e5\u672c"_ns));
+  }
+
+  // Locale de-DE; default options.
+  // In German standard sorting, umlauted characters are treated as variants
+  // of their base characters: ä ≅ a, ö ≅ o, ü ≅ u.
+  colFactory->CreateCollationForLocale("de-DE"_ns, getter_AddRefs(collation));
+  ASSERT_TRUE(collation);
+
+  {
+    CollationComparator comparator(collation);
+    input.Sort(comparator);
+
+    ASSERT_TRUE(input[0].Equals(u"\u00a1viva Espa\u00f1a!"_ns));
+    ASSERT_TRUE(input[1].Equals(u"Argentina"_ns));
+    ASSERT_TRUE(input[2].Equals(u"la France"_ns));
+    ASSERT_TRUE(input[3].Equals(u"Oerlikon"_ns));
+    ASSERT_TRUE(input[4].Equals(u"Offenbach"_ns));
+    ASSERT_TRUE(input[5].Equals(u"\u00d6sterreich"_ns));
+    ASSERT_TRUE(input[6].Equals(u"Sverige"_ns));
+    ASSERT_TRUE(input[7].Equals(u"Vaticano"_ns));
+    ASSERT_TRUE(input[8].Equals(u"Zimbabwe"_ns));
+    ASSERT_TRUE(input[9].Equals(u"\ud55c\uad6d"_ns));
+    ASSERT_TRUE(input[10].Equals(u"\u4e2d\u56fd"_ns));
+    ASSERT_TRUE(input[11].Equals(u"\u65e5\u672c"_ns));
+  }
+}
diff --git a/intl/locale/tests/unit/test_collation.js b/intl/locale/tests/unit/test_collation.js
deleted file mode 100644
index 1eb3fd2dfe0dd..0000000000000
--- a/intl/locale/tests/unit/test_collation.js
+++ /dev/null
@@ -1,78 +0,0 @@
-ChromeUtils.import("resource://gre/modules/Services.jsm");
-
-function run_test() {
-  var input = [
-    "Argentina",
-    "Oerlikon",
-    "Offenbach",
-    "Sverige",
-    "Vaticano",
-    "Zimbabwe",
-    "la France",
-    "¡viva España!",
-    "Österreich",
-    "中国",
-    "日本",
-    "한국",
-  ];
-
-  function test(locale, expected) {
-    var collator = Cc["@mozilla.org/intl/collation-factory;1"]
-      .createInstance(Ci.nsICollationFactory)
-      .CreateCollationForLocale(locale);
-    var strength = Ci.nsICollation.kCollationStrengthDefault;
-    var actual = input.sort((x, y) => collator.compareString(strength, x, y));
-    deepEqual(actual, expected, locale);
-  }
-
-  // Locale en-US; default options.
-  test("en-US", [
-    "¡viva España!",
-    "Argentina",
-    "la France",
-    "Oerlikon",
-    "Offenbach",
-    "Österreich",
-    "Sverige",
-    "Vaticano",
-    "Zimbabwe",
-    "한국",
-    "中国",
-    "日本",
-  ]);
-
-  // Locale sv-SE; default options.
-  // Swedish treats "Ö" as a separate character, which sorts after "Z".
-  test("sv-SE", [
-    "¡viva España!",
-    "Argentina",
-    "la France",
-    "Oerlikon",
-    "Offenbach",
-    "Sverige",
-    "Vaticano",
-    "Zimbabwe",
-    "Österreich",
-    "한국",
-    "中国",
-    "日本",
-  ]);
-
-  // Locale de-DE; default options.
-  // In German standard sorting, umlauted characters are treated as variants
-  // of their base characters: ä ≅ a, ö ≅ o, ü ≅ u.
-  test("de-DE", [
-    "¡viva España!",
-    "Argentina",
-    "la France",
-    "Oerlikon",
-    "Offenbach",
-    "Österreich",
-    "Sverige",
-    "Vaticano",
-    "Zimbabwe",
-    "한국",
-    "中国",
-    "日本",
-  ]);
-}
diff --git a/intl/locale/tests/unit/xpcshell.ini b/intl/locale/tests/unit/xpcshell.ini
index f17a481b3e372..75ab01343430c 100644
--- a/intl/locale/tests/unit/xpcshell.ini
+++ b/intl/locale/tests/unit/xpcshell.ini
@@ -7,9 +7,6 @@ support-files =
 [test_bug22310.js]
 skip-if = toolkit != "windows" && toolkit != "cocoa"
 
-[test_collation.js]
-skip-if = toolkit == "android" # ICU might be turned off
-
 [test_bug1086527.js]
 [test_intl_on_workers.js]
 skip-if = toolkit == "android" # bug 1309447