1 files changed, 191 insertions, 0 deletions
diff --git a/mfbt/tests/gtest/TestAlgorithm.cpp b/mfbt/tests/gtest/TestAlgorithm.cpp
new file mode 100644
index 0000000000..a01531fa77
--- /dev/null
+++ b/mfbt/tests/gtest/TestAlgorithm.cpp
@@ -0,0 +1,191 @@
+/* -*- 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 "gtest/gtest.h"
+
+#include "mozilla/Algorithm.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/ResultVariant.h"
+
+#include <iterator>
+#include <vector>
+
+using namespace mozilla;
+using std::begin;
+using std::end;
+
+namespace {
+struct MoveOnly {
+  explicit MoveOnly(int32_t aValue) : mValue{Some(aValue)} {}
+
+  MoveOnly(MoveOnly&&) = default;
+  MoveOnly& operator=(MoveOnly&&) = default;
+
+  Maybe<int32_t> mValue;
+};
+
+struct TestError {};
+
+constexpr static int32_t arr1[3] = {1, 2, 3};
+}  // namespace
+
+TEST(MFBT_Algorithm_TransformAbortOnErr, NoError)
+{
+  std::vector<int64_t> out;
+  auto res = TransformAbortOnErr(
+      begin(arr1), end(arr1), std::back_inserter(out),
+      [](const int32_t value) -> Result<int64_t, TestError> {
+        return value * 10;
+      });
+  ASSERT_TRUE(res.isOk());
+
+  const std::vector<int64_t> expected = {10, 20, 30};
+  ASSERT_EQ(expected, out);
+}
+
+TEST(MFBT_Algorithm_TransformAbortOnErr, NoError_Range)
+{
+  std::vector<int64_t> out;
+  auto res = TransformAbortOnErr(
+      arr1, std::back_inserter(out),
+      [](const int32_t value) -> Result<int64_t, TestError> {
+        return value * 10;
+      });
+  ASSERT_TRUE(res.isOk());
+
+  const std::vector<int64_t> expected = {10, 20, 30};
+  ASSERT_EQ(expected, out);
+}
+
+TEST(MFBT_Algorithm_TransformAbortOnErr, ErrorOnFirst)
+{
+  std::vector<int64_t> out;
+  auto res = TransformAbortOnErr(
+      begin(arr1), end(arr1), std::back_inserter(out),
+      [](const int32_t value) -> Result<int64_t, TestError> {
+        return Err(TestError{});
+      });
+  ASSERT_TRUE(res.isErr());
+  ASSERT_TRUE(out.empty());
+}
+
+TEST(MFBT_Algorithm_TransformAbortOnErr, ErrorOnOther)
+{
+  std::vector<int64_t> out;
+  auto res = TransformAbortOnErr(
+      begin(arr1), end(arr1), std::back_inserter(out),
+      [](const int32_t value) -> Result<int64_t, TestError> {
+        if (value > 2) {
+          return Err(TestError{});
+        }
+        return value * 10;
+      });
+  ASSERT_TRUE(res.isErr());
+
+  // XXX Should we assert on this, or is the content of out an implementation
+  // detail?
+  const std::vector<int64_t> expected = {10, 20};
+  ASSERT_EQ(expected, out);
+}
+
+TEST(MFBT_Algorithm_TransformAbortOnErr, ErrorOnOther_Move)
+{
+  MoveOnly in[3] = {MoveOnly{1}, MoveOnly{2}, MoveOnly{3}};
+  std::vector<int64_t> out;
+  auto res = TransformAbortOnErr(
+      std::make_move_iterator(begin(in)), std::make_move_iterator(end(in)),
+      std::back_inserter(out),
+      [](MoveOnly value) -> Result<int64_t, TestError> {
+        if (*value.mValue > 1) {
+          return Err(TestError{});
+        }
+        return *value.mValue * 10;
+      });
+  ASSERT_TRUE(res.isErr());
+
+  ASSERT_FALSE(in[0].mValue);
+  ASSERT_FALSE(in[1].mValue);
+  ASSERT_TRUE(in[2].mValue);
+
+  // XXX Should we assert on this, or is the content of out an implementation
+  // detail?
+  const std::vector<int64_t> expected = {10};
+  ASSERT_EQ(expected, out);
+}
+
+TEST(MFBT_Algorithm_TransformIfAbortOnErr, NoError)
+{
+  std::vector<int64_t> out;
+  auto res = TransformIfAbortOnErr(
+      begin(arr1), end(arr1), std::back_inserter(out),
+      [](const int32_t value) { return value % 2 == 1; },
+      [](const int32_t value) -> Result<int64_t, TestError> {
+        return value * 10;
+      });
+  ASSERT_TRUE(res.isOk());
+
+  const std::vector<int64_t> expected = {10, 30};
+  ASSERT_EQ(expected, out);
+}
+
+TEST(MFBT_Algorithm_TransformIfAbortOnErr, NoError_Range)
+{
+  std::vector<int64_t> out;
+  auto res = TransformIfAbortOnErr(
+      arr1, std::back_inserter(out),
+      [](const int32_t value) { return value % 2 == 1; },
+      [](const int32_t value) -> Result<int64_t, TestError> {
+        return value * 10;
+      });
+  ASSERT_TRUE(res.isOk());
+
+  const std::vector<int64_t> expected = {10, 30};
+  ASSERT_EQ(expected, out);
+}
+
+TEST(MFBT_Algorithm_TransformIfAbortOnErr, ErrorOnOther)
+{
+  std::vector<int64_t> out;
+  auto res = TransformIfAbortOnErr(
+      begin(arr1), end(arr1), std::back_inserter(out),
+      [](const int32_t value) { return value % 2 == 1; },
+      [](const int32_t value) -> Result<int64_t, TestError> {
+        if (value > 2) {
+          return Err(TestError{});
+        }
+        return value * 10;
+      });
+  ASSERT_TRUE(res.isErr());
+
+  const std::vector<int64_t> expected = {10};
+  ASSERT_EQ(expected, out);
+}
+
+TEST(MFBT_Algorithm_TransformIfAbortOnErr, ErrorOnOther_Move)
+{
+  MoveOnly in[3] = {MoveOnly{1}, MoveOnly{2}, MoveOnly{3}};
+  std::vector<int64_t> out;
+  auto res = TransformIfAbortOnErr(
+      std::make_move_iterator(begin(in)), std::make_move_iterator(end(in)),
+      std::back_inserter(out),
+      [](const MoveOnly& value) { return *value.mValue % 2 == 1; },
+      [](MoveOnly value) -> Result<int64_t, TestError> {
+        if (*value.mValue > 1) {
+          return Err(TestError{});
+        }
+        return *value.mValue * 10;
+      });
+  ASSERT_TRUE(res.isErr());
+
+  ASSERT_FALSE(in[0].mValue);
+  ASSERT_TRUE(in[1].mValue);
+  ASSERT_FALSE(in[2].mValue);
+
+  // XXX Should we assert on this, or is the content of out an implementation
+  // detail?
+  const std::vector<int64_t> expected = {10};
+  ASSERT_EQ(expected, out);
+}