tests: [WIP] add unit tests for some of the instructions

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

apps/target/main.cc

@@ -6,6 +6,7 @@
 #include <fstream>
 #include <iostream>
 #include <memory>
+#include <ostream>
 #include <unistd.h>
 #include <vector>
 
@@ -80,6 +81,9 @@ main(int argc, const char* argv[]) {
         return 1;
     }
 
+    std::flush(std::cout);
+    std::flush(std::cerr);
+
     {
         Memory memory(std::move(bios), std::move(rom));
         Bus bus(memory);