1 files changed, 150 insertions, 0 deletions
diff --git a/mfbt/tests/TestIntegerRange.cpp b/mfbt/tests/TestIntegerRange.cpp
new file mode 100644
index 0000000000..3aad90fcc1
--- /dev/null
+++ b/mfbt/tests/TestIntegerRange.cpp
@@ -0,0 +1,150 @@
+/* -*- 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/Assertions.h"
+#include "mozilla/IntegerRange.h"
+
+#include <stddef.h>
+
+using mozilla::IntegerRange;
+using mozilla::Reversed;
+
+const size_t kMaxNumber = 50;
+const size_t kArraySize = 256;
+
+template <typename IntType>
+static IntType GenerateNumber() {
+  return static_cast<IntType>(rand() % kMaxNumber + 1);
+}
+
+template <typename IntType>
+static void TestSingleParamRange(const IntType aN) {
+  IntType array[kArraySize];
+  IntType* ptr = array;
+  for (auto i : IntegerRange(aN)) {
+    static_assert(std::is_same_v<decltype(i), IntType>,
+                  "type of the loop var and the param should be the same");
+    *ptr++ = i;
+  }
+
+  MOZ_RELEASE_ASSERT(ptr - array == static_cast<ptrdiff_t>(aN),
+                     "Should iterates N items");
+  for (size_t i = 0; i < static_cast<size_t>(aN); i++) {
+    MOZ_RELEASE_ASSERT(array[i] == static_cast<IntType>(i),
+                       "Values should equal to the index");
+  }
+}
+
+template <typename IntType>
+static void TestSingleParamReverseRange(const IntType aN) {
+  IntType array[kArraySize];
+  IntType* ptr = array;
+  for (auto i : Reversed(IntegerRange(aN))) {
+    static_assert(std::is_same_v<decltype(i), IntType>,
+                  "type of the loop var and the param should be the same");
+    *ptr++ = i;
+  }
+
+  MOZ_RELEASE_ASSERT(ptr - array == static_cast<ptrdiff_t>(aN),
+                     "Should iterates N items");
+  for (size_t i = 0; i < static_cast<size_t>(aN); i++) {
+    MOZ_RELEASE_ASSERT(array[i] == static_cast<IntType>(aN - i - 1),
+                       "Values should be the reverse of their index");
+  }
+}
+
+template <typename IntType>
+static void TestSingleParamIntegerRange() {
+  const auto kN = GenerateNumber<IntType>();
+  TestSingleParamRange<IntType>(0);
+  TestSingleParamReverseRange<IntType>(0);
+  TestSingleParamRange<IntType>(kN);
+  TestSingleParamReverseRange<IntType>(kN);
+}
+
+template <typename IntType1, typename IntType2>
+static void TestDoubleParamRange(const IntType1 aBegin, const IntType2 aEnd) {
+  IntType2 array[kArraySize];
+  IntType2* ptr = array;
+  for (auto i : IntegerRange(aBegin, aEnd)) {
+    static_assert(std::is_same_v<decltype(i), IntType2>,
+                  "type of the loop var "
+                  "should be same as that of the second param");
+    *ptr++ = i;
+  }
+
+  MOZ_RELEASE_ASSERT(ptr - array == static_cast<ptrdiff_t>(aEnd - aBegin),
+                     "Should iterates (aEnd - aBegin) times");
+  for (size_t i = 0; i < static_cast<size_t>(aEnd - aBegin); i++) {
+    MOZ_RELEASE_ASSERT(array[i] == static_cast<IntType2>(aBegin + i),
+                       "Should iterate integers in [aBegin, aEnd) in order");
+  }
+}
+
+template <typename IntType1, typename IntType2>
+static void TestDoubleParamReverseRange(const IntType1 aBegin,
+                                        const IntType2 aEnd) {
+  IntType2 array[kArraySize];
+  IntType2* ptr = array;
+  for (auto i : Reversed(IntegerRange(aBegin, aEnd))) {
+    static_assert(std::is_same_v<decltype(i), IntType2>,
+                  "type of the loop var "
+                  "should be same as that of the second param");
+    *ptr++ = i;
+  }
+
+  MOZ_RELEASE_ASSERT(ptr - array == static_cast<ptrdiff_t>(aEnd - aBegin),
+                     "Should iterates (aEnd - aBegin) times");
+  for (size_t i = 0; i < static_cast<size_t>(aEnd - aBegin); i++) {
+    MOZ_RELEASE_ASSERT(
+        array[i] == static_cast<IntType2>(aEnd - i - 1),
+        "Should iterate integers in [aBegin, aEnd) in reverse order");
+  }
+}
+
+template <typename IntType1, typename IntType2>
+static void TestDoubleParamIntegerRange() {
+  const auto kStart = GenerateNumber<IntType1>();
+  const auto kEnd = static_cast<IntType2>(kStart + GenerateNumber<IntType2>());
+  TestDoubleParamRange(kStart, static_cast<IntType2>(kStart));
+  TestDoubleParamReverseRange(kStart, static_cast<IntType2>(kStart));
+  TestDoubleParamRange(kStart, kEnd);
+  TestDoubleParamReverseRange(kStart, kEnd);
+}
+
+int main() {
+  TestSingleParamIntegerRange<int8_t>();
+  TestSingleParamIntegerRange<int16_t>();
+  TestSingleParamIntegerRange<int32_t>();
+  TestSingleParamIntegerRange<int64_t>();
+
+  TestSingleParamIntegerRange<uint8_t>();
+  TestSingleParamIntegerRange<uint16_t>();
+  TestSingleParamIntegerRange<uint32_t>();
+  TestSingleParamIntegerRange<uint64_t>();
+
+  TestDoubleParamIntegerRange<int8_t, int8_t>();
+  TestDoubleParamIntegerRange<int16_t, int16_t>();
+  TestDoubleParamIntegerRange<int32_t, int32_t>();
+  TestDoubleParamIntegerRange<int64_t, int64_t>();
+
+  TestDoubleParamIntegerRange<uint8_t, uint8_t>();
+  TestDoubleParamIntegerRange<uint16_t, uint16_t>();
+  TestDoubleParamIntegerRange<uint32_t, uint32_t>();
+  TestDoubleParamIntegerRange<uint64_t, uint64_t>();
+
+  TestDoubleParamIntegerRange<int8_t, int16_t>();
+  TestDoubleParamIntegerRange<int16_t, int32_t>();
+  TestDoubleParamIntegerRange<int32_t, int64_t>();
+  TestDoubleParamIntegerRange<int64_t, int8_t>();
+
+  TestDoubleParamIntegerRange<uint8_t, uint64_t>();
+  TestDoubleParamIntegerRange<uint16_t, uint8_t>();
+  TestDoubleParamIntegerRange<uint32_t, uint16_t>();
+  TestDoubleParamIntegerRange<uint64_t, uint32_t>();
+
+  return 0;
+}