chore: import upstream snapshot with attribution

test/string_printf_unittest.cpp

@@ -0,0 +1,54 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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 <gtest/gtest.h>
+#include "butil/string_printf.h"
+
+namespace {
+
+class BaiduStringPrintfTest : public ::testing::Test{
+protected:
+    BaiduStringPrintfTest(){
+    };
+    virtual ~BaiduStringPrintfTest(){};
+    virtual void SetUp() {
+    };
+    virtual void TearDown() {
+    };
+};
+
+TEST_F(BaiduStringPrintfTest, sanity) {
+
+    {
+        std::string sth = butil::string_printf("hello %d 124 %s", 1, "world");
+        ASSERT_EQ("hello 1 124 world", sth);
+
+        ASSERT_EQ("hello 1 124 world", butil::string_printf(sth.size(), "hello %d 124 %s", 1, "world"));
+        ASSERT_EQ("hello 1 124 world", butil::string_printf(sth.size() - 1, "hello %d 124 %s", 1, "world"));
+        ASSERT_EQ("hello 1 124 world", butil::string_printf(sth.size() + 1, "hello %d 124 %s", 1, "world"));
+
+    }
+    {
+        std::string sth;
+        ASSERT_EQ(0, butil::string_printf(&sth, "boolean %d", 1));
+        ASSERT_EQ("boolean 1", sth);
+        ASSERT_EQ(0, butil::string_appendf(&sth, "too simple"));
+        ASSERT_EQ("boolean 1too simple", sth);
+    }
+}
+
+}