diff --git a/CMakeLists.txt b/CMakeLists.txt
index f8cba336..a5543fac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -88,6 +88,9 @@ set(CMAKE_OSX_DEPLOYMENT_TARGET 10.15)
 
 find_package(TBB REQUIRED)
 
+set(TEST_QUAKE_MAP_EXPORT_DIR "" CACHE PATH "When running unit tests, export Quake maps to this directory (useful for testing in game)")
+set(TEST_QUAKE2_MAP_EXPORT_DIR "" CACHE PATH "When running unit tests, export Quake 2 maps to this directory (useful for testing in game)")
+
 # just creates testmaps.hh with absolute path to the testmaps source directory.
 # include it as #include <testmaps.hh>
 configure_file(testmaps.hh.in testmaps.hh @ONLY)
diff --git a/qbsp/test_qbsp.cc b/qbsp/test_qbsp.cc
index 68cadab9..bb3160f2 100644
--- a/qbsp/test_qbsp.cc
+++ b/qbsp/test_qbsp.cc
@@ -52,6 +52,12 @@ static mbsp_t LoadTestmap(const std::filesystem::path &name)
 
     ProcessFile();
 
+    if (strlen(test_quake_maps_dir) > 0) {
+        auto dest = fs::path(test_quake_maps_dir) / name;
+        dest.replace_extension(".bsp");
+        fs::copy(options.szBSPName, dest, fs::copy_options::overwrite_existing);
+    }
+
     // re-open the .bsp and return it
 
     options.szBSPName.replace_extension("bsp");
diff --git a/testmaps.hh.in b/testmaps.hh.in
index 3405a22b..e0bcc389 100644
--- a/testmaps.hh.in
+++ b/testmaps.hh.in
@@ -1 +1,3 @@
 const char *testmaps_dir = "@CMAKE_SOURCE_DIR@/testmaps";
+const char *test_quake_maps_dir = "@TEST_QUAKE_MAP_EXPORT_DIR@";
+const char *test_quake2_maps_dir = "@TEST_QUAKE2_MAP_EXPORT_DIR@";