better use of fixtures for resource allocation and

dealocation

test/parser/return.cpp

@@ -1,5 +1,3 @@
-#include "ast/ast.hpp"
-#include "parser/parser.hpp"
 #include "utils.hpp"
 
 #include <doctest.h>
@@ -12,13 +10,6 @@ return 10;\
 return 103213;\
 ");
 
-        ast::program* program = p->parse_program();
-        check_parser_errors(p->errors);
-
-        REQUIRE_MESSAGE(
-            program != nullptr,
-            "parse_program() returned a null pointer"
-        );
         REQUIRE(program->statements.size() == 3);
 
         for (const auto stmt : program->statements) {
@@ -30,7 +21,5 @@ return 103213;\
                 "Couldn't cast statement to a return statement"
             );
         }
-
-        delete program;
     }
 }