1 files changed, 124 insertions, 0 deletions
diff --git a/absl/crc/internal/crc_cord_state_test.cc b/absl/crc/internal/crc_cord_state_test.cc
new file mode 100644
index 00000000..e2c8e3cd
--- /dev/null
+++ b/absl/crc/internal/crc_cord_state_test.cc
@@ -0,0 +1,124 @@
+// Copyright 2022 The Abseil Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/crc/internal/crc_cord_state.h"
+
+#include <algorithm>
+#include <cstdint>
+#include <string>
+#include <utility>
+
+#include "gtest/gtest.h"
+#include "absl/crc/crc32c.h"
+
+namespace {
+
+TEST(CrcCordState, Default) {
+  absl::crc_internal::CrcCordState state;
+  EXPECT_TRUE(state.IsNormalized());
+  EXPECT_EQ(state.Checksum(), absl::crc32c_t{0});
+  state.Normalize();
+  EXPECT_EQ(state.Checksum(), absl::crc32c_t{0});
+}
+
+TEST(CrcCordState, Normalize) {
+  absl::crc_internal::CrcCordState state;
+  auto* rep = state.mutable_rep();
+  rep->prefix_crc.push_back(
+      absl::crc_internal::CrcCordState::PrefixCrc(1000, absl::crc32c_t{1000}));
+  rep->prefix_crc.push_back(
+      absl::crc_internal::CrcCordState::PrefixCrc(2000, absl::crc32c_t{2000}));
+  rep->removed_prefix =
+      absl::crc_internal::CrcCordState::PrefixCrc(500, absl::crc32c_t{500});
+
+  // The removed_prefix means state is not normalized.
+  EXPECT_FALSE(state.IsNormalized());
+
+  absl::crc32c_t crc = state.Checksum();
+  state.Normalize();
+  EXPECT_TRUE(state.IsNormalized());
+
+  // The checksum should not change as a result of calling Normalize().
+  EXPECT_EQ(state.Checksum(), crc);
+  EXPECT_EQ(rep->removed_prefix.length, 0);
+}
+
+TEST(CrcCordState, Copy) {
+  absl::crc_internal::CrcCordState state;
+  auto* rep = state.mutable_rep();
+  rep->prefix_crc.push_back(
+      absl::crc_internal::CrcCordState::PrefixCrc(1000, absl::crc32c_t{1000}));
+
+  absl::crc_internal::CrcCordState copy = state;
+
+  EXPECT_EQ(state.Checksum(), absl::crc32c_t{1000});
+  EXPECT_EQ(copy.Checksum(), absl::crc32c_t{1000});
+}
+
+TEST(CrcCordState, UnsharedSelfCopy) {
+  absl::crc_internal::CrcCordState state;
+  auto* rep = state.mutable_rep();
+  rep->prefix_crc.push_back(
+      absl::crc_internal::CrcCordState::PrefixCrc(1000, absl::crc32c_t{1000}));
+
+  const absl::crc_internal::CrcCordState& ref = state;
+  state = ref;
+
+  EXPECT_EQ(state.Checksum(), absl::crc32c_t{1000});
+}
+
+TEST(CrcCordState, Move) {
+  absl::crc_internal::CrcCordState state;
+  auto* rep = state.mutable_rep();
+  rep->prefix_crc.push_back(
+      absl::crc_internal::CrcCordState::PrefixCrc(1000, absl::crc32c_t{1000}));
+
+  absl::crc_internal::CrcCordState moved = std::move(state);
+  EXPECT_EQ(moved.Checksum(), absl::crc32c_t{1000});
+}
+
+TEST(CrcCordState, UnsharedSelfMove) {
+  absl::crc_internal::CrcCordState state;
+  auto* rep = state.mutable_rep();
+  rep->prefix_crc.push_back(
+      absl::crc_internal::CrcCordState::PrefixCrc(1000, absl::crc32c_t{1000}));
+
+  absl::crc_internal::CrcCordState& ref = state;
+  state = std::move(ref);
+
+  EXPECT_EQ(state.Checksum(), absl::crc32c_t{1000});
+}
+
+TEST(CrcCordState, PoisonDefault) {
+  absl::crc_internal::CrcCordState state;
+  state.Poison();
+  EXPECT_NE(state.Checksum(), absl::crc32c_t{0});
+}
+
+TEST(CrcCordState, PoisonData) {
+  absl::crc_internal::CrcCordState state;
+  auto* rep = state.mutable_rep();
+  rep->prefix_crc.push_back(
+      absl::crc_internal::CrcCordState::PrefixCrc(1000, absl::crc32c_t{1000}));
+  rep->prefix_crc.push_back(
+      absl::crc_internal::CrcCordState::PrefixCrc(2000, absl::crc32c_t{2000}));
+  rep->removed_prefix =
+      absl::crc_internal::CrcCordState::PrefixCrc(500, absl::crc32c_t{500});
+
+  absl::crc32c_t crc = state.Checksum();
+  state.Poison();
+  EXPECT_NE(state.Checksum(), crc);
+}
+
+}  // namespace