Compare the specified exp to the string result of calling bsl::format with the specified format, value, and arg, and return true if they match and false otherwise. If they do not match, load into the specified message a value describing the inputs and result of the failed test. Perform these tests for both char-based and wchar_t-based strings.
Declared in <bdlt_formattestutil.h>
template<
class t_VALUE_TYPE,
class t_ARG_TYPE>
static
bool
testFormatArg(
bsl::string* message,
std::string_view const& exp,
std::string_view const& format,
t_VALUE_TYPE const& value,
t_ARG_TYPE const& arg);