Add sprintf test

0f03cbbd · minqiyang · 91c5602d · 0f03cbbd
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paddle/fluid/string/printf_test.cc paddle/fluid/string/printf_test.cc +1 -0

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--- a/paddle/fluid/string/printf_test.cc
+++ b/paddle/fluid/string/printf_test.cc
@@ -27,4 +27,5 @@ TEST(StringPrintf, StringPrintf) {
  EXPECT_EQ(std::string("Wednesday, July 27, 14:44"),
            paddle::string::Sprintf("%s, %s %d, %.2d:%.2d", weekday, month, day,
                                    hour, min));
+  EXPECT_EQ(std::string(""), paddle::string::Sprintf());
 }