Fixing things for programs with very large output.

tests/unit_executor_forkingexecutor.cpp

@@ -1,4 +1,5 @@
 #include <iostream>
+#include <filesystem>
 
 #include "daggy/executors/ForkingExecutor.hpp"
 
@@ -26,4 +27,15 @@ TEST_CASE("Basic Execution", "[forking_executor]") {
     REQUIRE(rec.error == "/usr/bin/expr: syntax error: missing argument after ‘+’\n");
     REQUIRE(rec.output.empty());
   }
+
+  SECTION("Large Output") {
+    const std::string BIG_FILE{"/usr/share/dict/cracklib-small"};
+    std::vector<std::string> cmd{"/usr/bin/cat", BIG_FILE};
+
+    auto rec = ex.runCommand(cmd);
+
+    REQUIRE(rec.rc == 0);
+    REQUIRE(rec.output.size() == std::filesystem::file_size(BIG_FILE));
+    REQUIRE(rec.error.empty());
+  }
 }