1 files changed, 82 insertions, 0 deletions
diff --git a/third_party/abseil_cpp/absl/strings/internal/resize_uninitialized_test.cc b/third_party/abseil_cpp/absl/strings/internal/resize_uninitialized_test.cc
new file mode 100644
index 0000000000..0f8b3c2a95
--- /dev/null
+++ b/third_party/abseil_cpp/absl/strings/internal/resize_uninitialized_test.cc
@@ -0,0 +1,82 @@
+// Copyright 2017 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/strings/internal/resize_uninitialized.h"
+
+#include "gtest/gtest.h"
+
+namespace {
+
+int resize_call_count = 0;
+
+// A mock string class whose only purpose is to track how many times its
+// resize() method has been called.
+struct resizable_string {
+  size_t size() const { return 0; }
+  char& operator[](size_t) {
+    static char c = '\0';
+    return c;
+  }
+  void resize(size_t) { resize_call_count += 1; }
+};
+
+int resize_default_init_call_count = 0;
+
+// A mock string class whose only purpose is to track how many times its
+// resize() and __resize_default_init() methods have been called.
+struct resize_default_init_string {
+  size_t size() const { return 0; }
+  char& operator[](size_t) {
+    static char c = '\0';
+    return c;
+  }
+  void resize(size_t) { resize_call_count += 1; }
+  void __resize_default_init(size_t) { resize_default_init_call_count += 1; }
+};
+
+TEST(ResizeUninit, WithAndWithout) {
+  resize_call_count = 0;
+  resize_default_init_call_count = 0;
+  {
+    resizable_string rs;
+
+    EXPECT_EQ(resize_call_count, 0);
+    EXPECT_EQ(resize_default_init_call_count, 0);
+    EXPECT_FALSE(
+        absl::strings_internal::STLStringSupportsNontrashingResize(&rs));
+    EXPECT_EQ(resize_call_count, 0);
+    EXPECT_EQ(resize_default_init_call_count, 0);
+    absl::strings_internal::STLStringResizeUninitialized(&rs, 237);
+    EXPECT_EQ(resize_call_count, 1);
+    EXPECT_EQ(resize_default_init_call_count, 0);
+  }
+
+  resize_call_count = 0;
+  resize_default_init_call_count = 0;
+  {
+    resize_default_init_string rus;
+
+    EXPECT_EQ(resize_call_count, 0);
+    EXPECT_EQ(resize_default_init_call_count, 0);
+    EXPECT_TRUE(
+        absl::strings_internal::STLStringSupportsNontrashingResize(&rus));
+    EXPECT_EQ(resize_call_count, 0);
+    EXPECT_EQ(resize_default_init_call_count, 0);
+    absl::strings_internal::STLStringResizeUninitialized(&rus, 237);
+    EXPECT_EQ(resize_call_count, 0);
+    EXPECT_EQ(resize_default_init_call_count, 1);
+  }
+}
+
+}  // namespace