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@safe pure unittest
{
import std.format.spec;
import std.array : appender;
auto a = appender!(string)();
auto fmt = "Number: %6.4e\nString: %s";
auto f = FormatSpec!char(fmt);
assert(f.writeUpToNextSpec(a));
assert(a.data == "Number: ");
assert(f.trailing == "\nString: %s");
assert(f.spec == 'e');
assert(f.width == 6);
assert(f.precision == 4);
assert(f.writeUpToNextSpec(a));
assert(a.data == "Number: \nString: ");
assert(f.trailing == "");
assert(f.spec == 's');
assert(!f.writeUpToNextSpec(a));
assert(a.data == "Number: \nString: ");
}
@safe pure unittest
{
import std.format.spec;
import std.array : appender;
import std.format.write : formatValue;
auto spec = singleSpec("%10.3e");
auto writer = appender!string();
writer.formatValue(42.0, spec);
assert(writer.data == " 4.200e+01");
}
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