1 files changed, 46 insertions, 0 deletions
diff --git a/mfbt/tests/TestEnumeratedArray.cpp b/mfbt/tests/TestEnumeratedArray.cpp
new file mode 100644
index 0000000000..dfc1a37f17
--- /dev/null
+++ b/mfbt/tests/TestEnumeratedArray.cpp
@@ -0,0 +1,46 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/EnumeratedArray.h"
+
+using mozilla::EnumeratedArray;
+
+enum class AnimalSpecies { Cow, Sheep, Pig, Count };
+
+using TestArray = EnumeratedArray<AnimalSpecies, AnimalSpecies::Count, int>;
+
+void TestInitialValueByConstructor() {
+  // Style 1
+  TestArray headCount(1, 2, 3);
+  MOZ_RELEASE_ASSERT(headCount[AnimalSpecies::Cow] == 1);
+  MOZ_RELEASE_ASSERT(headCount[AnimalSpecies::Sheep] == 2);
+  MOZ_RELEASE_ASSERT(headCount[AnimalSpecies::Pig] == 3);
+  // Style 2
+  TestArray headCount2{5, 6, 7};
+  MOZ_RELEASE_ASSERT(headCount2[AnimalSpecies::Cow] == 5);
+  MOZ_RELEASE_ASSERT(headCount2[AnimalSpecies::Sheep] == 6);
+  MOZ_RELEASE_ASSERT(headCount2[AnimalSpecies::Pig] == 7);
+  // Style 3
+  TestArray headCount3({8, 9, 10});
+  MOZ_RELEASE_ASSERT(headCount3[AnimalSpecies::Cow] == 8);
+  MOZ_RELEASE_ASSERT(headCount3[AnimalSpecies::Sheep] == 9);
+  MOZ_RELEASE_ASSERT(headCount3[AnimalSpecies::Pig] == 10);
+}
+
+void TestAssignment() {
+  TestArray headCount{8, 9, 10};
+  TestArray headCount2;
+  headCount2 = headCount;
+  MOZ_RELEASE_ASSERT(headCount2[AnimalSpecies::Cow] == 8);
+  MOZ_RELEASE_ASSERT(headCount2[AnimalSpecies::Sheep] == 9);
+  MOZ_RELEASE_ASSERT(headCount2[AnimalSpecies::Pig] == 10);
+}
+
+int main() {
+  TestInitialValueByConstructor();
+  TestAssignment();
+  return 0;
+}