Roll forward to cl/338482889

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: Ic2bdb234e89f3c5860d1b483dd4bce689f13d057

cpp/platform/base/byte_array_test.cc

@@ -0,0 +1,90 @@
+// Copyright 2020 Google LLC
+//
+// 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 "platform/base/byte_array.h"
+
+#include <cstring>
+
+#include "gtest/gtest.h"
+
+namespace {
+
+using location::nearby::ByteArray;
+
+TEST(ByteArrayTest, DefaultSizeIsZero) {
+  ByteArray bytes;
+  EXPECT_EQ(0, bytes.size());
+}
+
+TEST(ByteArrayTest, DefaultIsEmpty) {
+  ByteArray bytes;
+  EXPECT_TRUE(bytes.Empty());
+}
+
+TEST(ByteArrayTest, NullArrayIsEmpty) {
+  ByteArray bytes{nullptr, 5};
+  EXPECT_TRUE(bytes.Empty());
+}
+
+TEST(ByteArrayTest, CopyAtDoesNotExtendArray) {
+  ByteArray v1("12345");
+  ByteArray v2("ABCDEFGH");
+  EXPECT_TRUE(v2.CopyAt(/*offset=*/5, v1));
+  EXPECT_TRUE(v2.CopyAt(/*offset=*/1, v1, /*source_offset=*/3));
+  EXPECT_EQ(v2, ByteArray("A45DE123"));
+}
+
+TEST(ByteArrayTest, CopyAtOutOfBoundsIsIgnored) {
+  ByteArray v1("12345");
+  ByteArray v2("ABCDEFGH");
+  // Try to do an out-of-bounds read.
+  EXPECT_FALSE(v2.CopyAt(/* offset=*/5, v1, /*source_offset=*/10));
+  // Try to do an out-of-bounds write.
+  EXPECT_FALSE(v2.CopyAt(/* offset=*/9, v1));
+  EXPECT_EQ(v2, ByteArray("ABCDEFGH"));
+}
+
+TEST(ByteArrayTest, SetFromString) {
+  std::string setup("setup_test");
+  ByteArray bytes{setup};  // array initialized with a copy of string.
+  EXPECT_EQ(setup.size(), bytes.size());
+  EXPECT_EQ(std::string(bytes), setup);
+}
+
+TEST(ByteArrayTest, SetExplicitSize) {
+  constexpr size_t kArraySize = 10;
+  char reference[kArraySize]{};
+  ByteArray bytes{kArraySize};  // array of size 10, zero-initialized.
+  EXPECT_EQ(kArraySize, bytes.size());
+  EXPECT_EQ(0, memcmp(bytes.data(), reference, kArraySize));
+}
+
+TEST(ByteArrayTest, SetExplicitData) {
+  constexpr static const char message[]{"test_message"};
+  constexpr size_t kMessageSize = sizeof(message);
+  ByteArray bytes{message, kMessageSize};
+  EXPECT_EQ(kMessageSize, bytes.size());
+  EXPECT_NE(message, bytes.data());
+  EXPECT_EQ(0, memcmp(message, bytes.data(), kMessageSize));
+}
+
+TEST(ByteArrayTest, CreateFromNonNullTerminatedStdArray) {
+  constexpr static const std::array data{'a', '\x00', 'b'};
+  ByteArray bytes{data};
+  EXPECT_EQ(bytes.size(), 3);
+  EXPECT_EQ(bytes.size(), std::string(bytes).size());
+  EXPECT_EQ(std::string(bytes), std::string(data.data(), data.size()));
+}
+
+}  // namespace