Split test struct and handler macros out for the emitter/spec tests

test/handlermacros.h

@@ -1,3 +1,4 @@
+#include "teststruct.h"
 #pragma once
 
 #include "yaml-cpp/yaml.h"
@@ -5,8 +6,6 @@
 #include <string>
 #include <cassert>
 
-#define YAML_ASSERT(cond) do { if(!(cond)) return "  Assert failed: " #cond; } while(false)
-
 namespace Test {
     std::string Quote(const std::string& text) {
         YAML::Emitter out;