chore: import upstream snapshot with attribution

test/cpp/utils/string/string_helper_test.cc

@@ -0,0 +1,85 @@
+// Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
+//
+// 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
+//
+//     http://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 "paddle/utils/string/string_helper.h"
+
+#include <string>
+
+#include "gtest/gtest.h"
+
+TEST(StringHelper, EndsWith) {
+  std::string input("hello world");
+  std::string test1("world");
+  std::string test2("helloworld");
+  std::string test3("hello world hello world");
+
+  EXPECT_TRUE(paddle::string::ends_with(input, test1));
+  EXPECT_TRUE(paddle::string::ends_with(input, input));
+
+  EXPECT_FALSE(paddle::string::ends_with(input, test2));
+  EXPECT_FALSE(paddle::string::ends_with(input, test3));
+}
+
+TEST(StringHelper, FormatStringAppend) {
+  std::string str("hello");
+  char fmt[] = "%d";  // NOLINT
+
+  paddle::string::format_string_append(str, fmt, 10);
+  EXPECT_EQ(str, "hello10");
+}
+
+TEST(StringHelper, JoinStrings) {
+  std::vector<std::string> v;
+  v.emplace_back("hello");
+  v.emplace_back("world");
+
+  std::string result = paddle::string::join_strings(v, ' ');
+  EXPECT_EQ(result, "hello world");
+
+  result = paddle::string::join_strings(v, '\n');
+  EXPECT_EQ(result, "hello\nworld");
+
+  result = paddle::string::join_strings(v, ',');
+  EXPECT_EQ(result, "hello,world");
+
+  result = paddle::string::join_strings(v, " new ");
+  EXPECT_EQ(result, "hello new world");
+}
+
+TEST(StringHelper, JoinStringsWithConversion) {
+  std::vector<int> v = {2, 3};
+  auto result =
+      paddle::string::join_strings(v, ",", [](int x) { return x * x; });
+  EXPECT_EQ(result, "4,9");
+}
+
+TEST(StringHelper, SplitString) {
+  std::string line = "hello world my world";
+  std::vector<paddle::string::str_ptr> vals;
+  int num = 0;
+  num =
+      paddle::string::split_string_ptr(line.c_str(), line.length(), ' ', &vals);
+  EXPECT_EQ(num, 4);
+
+  num = paddle::string::split_string_ptr(
+      line.c_str(), line.length(), ' ', &vals, 3);
+  EXPECT_EQ(num, 3);
+
+  num = paddle::string::split_string_ptr(
+      line.c_str(), line.length(), ' ', &vals, 10);
+  EXPECT_EQ(num, 4);
+
+  num = paddle::string::split_string_ptr(line.c_str(), -1, ' ', &vals, 3);
+  EXPECT_EQ(num, 0);
+}