martinzink commented on code in PR #1517:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1517#discussion_r1120105930


##########
libminifi/test/unit/StringUtilsTests.cpp:
##########
@@ -388,30 +390,22 @@ TEST_CASE("TestStringUtils::testBase64Decode", "[test 
base64 decode]") {
   REQUIRE("oooooo" == StringUtils::from_base64("b29vb29v", as_string));
   REQUIRE("\xfb\xff\xbf" == StringUtils::from_base64("-_-_", as_string));
   REQUIRE("\xfb\xff\xbf" == StringUtils::from_base64("+/+/", as_string));
-  REQUIRE(std::string({   0,   16, -125,   16,
-                         81, -121,   32, -110,
-                       -117,   48,  -45, -113,
-                         65,   20, -109,   81,
-                         85, -105,   97, -106,
-                       -101,  113,  -41,  -97,
-                       -126,   24,  -93, -110,
-                         89,  -89,  -94, -102,
-                        -85,  -78,  -37,  -81,
-                        -61,   28,  -77,  -45,
-                         93,  -73,  -29,  -98,
-                        -69,  -13,  -33,  -65}) == 
StringUtils::from_base64("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
 as_string));
-  REQUIRE(std::string({   0,   16, -125,   16,
-                         81, -121,   32, -110,
-                       -117,   48,  -45, -113,
-                         65,   20, -109,   81,
-                         85, -105,   97, -106,
-                       -101,  113,  -41,  -97,
-                       -126,   24,  -93, -110,
-                         89,  -89,  -94, -102,
-                        -85,  -78,  -37,  -81,
-                        -61,   28,  -77,  -45,
-                         93,  -73,  -29,  -98,
-                        -69,  -13,  -33,  -65}) == 
StringUtils::from_base64("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_",
 as_string));
+  std::string expected{
+      static_cast<char>(0), static_cast<char>(16), static_cast<char>(-125), 
static_cast<char>(16),
+      static_cast<char>(81), static_cast<char>(-121), static_cast<char>(32), 
static_cast<char>(-110),
+      static_cast<char>(-117), static_cast<char>(48), static_cast<char>(-45), 
static_cast<char>(-113),
+      static_cast<char>(65), static_cast<char>(20), static_cast<char>(-109), 
static_cast<char>(81),
+      static_cast<char>(85), static_cast<char>(-105), static_cast<char>(97), 
static_cast<char>(-106),
+      static_cast<char>(-101), static_cast<char>(113), static_cast<char>(-41), 
static_cast<char>(-97),
+      static_cast<char>(-126), static_cast<char>(24), static_cast<char>(-93), 
static_cast<char>(-110),
+      static_cast<char>(89), static_cast<char>(-89), static_cast<char>(-94), 
static_cast<char>(-102),
+      static_cast<char>(-85), static_cast<char>(-78), static_cast<char>(-37), 
static_cast<char>(-81),
+      static_cast<char>(-61), static_cast<char>(28), static_cast<char>(-77), 
static_cast<char>(-45),
+      static_cast<char>(93), static_cast<char>(-73), static_cast<char>(-29), 
static_cast<char>(-98),
+      static_cast<char>(-69), static_cast<char>(-13), static_cast<char>(-33), 
static_cast<char>(-65)};

Review Comment:
   Good idea, unfortunetly this version fails for some reason(it creates an 
empty string) on my machine. But I've created [something 
similar](https://github.com/apache/nifi-minifi-cpp/pull/1517/commits/8526c237224d7f9a67d88bc0fca6428e1e873083)
 based on your idea. 



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