A simple brainfuck interpreter for the game's idea.

tests/game_engine.cpp

@@ -1,6 +1,28 @@
 #include <doctest.h>
 #include "../game_engine.hpp"
 
+TEST_CASE("brainfuck test") {
+  Brainfucker bf;
+  string code{"+.>+.>+.>"};
+
+  bf.set_code(code);
+
+  // this is actually ticks, not code length
+  bf.run(code.size());
+
+  CHECK(bf.data[0] == 1);
+  CHECK(bf.data[1] == 1);
+  CHECK(bf.data[2] == 1);
+
+  bf.reset();
+
+  CHECK(bf.data[0] == 0);
+  CHECK(bf.data[1] == 0);
+  CHECK(bf.data[2] == 0);
+
+  CHECK(bf.code.empty());
+}
+
 TEST_CASE("game engine can start and take hit") {
   // test fails on purpose right now
   GameEngine game{4};