Codechange: introduce regression script for GS compat scripts

regression/CMakeLists.txt

@@ -23,3 +23,4 @@
     add_subdirectory(regression)
     add_subdirectory(stationlist)
     add_subdirectory(gs)
+    add_subdirectory(gs_compat)

regression/gs_compat/CMakeLists.txt

@@ -0,0 +1,7 @@
+include(CreateRegression)
+create_regression("game"
+    ${CMAKE_CURRENT_SOURCE_DIR}/info.nut
+    ${CMAKE_CURRENT_SOURCE_DIR}/main.nut
+    ${CMAKE_CURRENT_SOURCE_DIR}/result.txt
+    ${CMAKE_CURRENT_SOURCE_DIR}/test.sav
+)

regression/gs_compat/info.nut

@@ -0,0 +1,13 @@
+class CompatRegression extends GSInfo {
+	function GetAuthor()      { return "OpenTTD GS Developers Team"; }
+	function GetName()        { return "Compat Regression"; }
+	function GetShortName()   { return "REGC"; }
+	function GetDescription() { return "This runs regression on the compat scripts."; }
+	function GetVersion()     { return 1; }
+	function GetAPIVersion()  { return "1.2"; }
+	function GetDate()        { return "2026-05-19"; }
+	function CreateInstance() { return "CompatRegression"; }
+	function UseAsRandomAI()  { return false; }
+}
+
+RegisterGS(CompatRegression());

regression/gs_compat/main.nut

@@ -0,0 +1,6 @@
+class CompatRegression extends GSController {
+	function Start()
+	{
+		print("Done...");
+	}
+};

regression/gs_compat/result.txt

@@ -0,0 +1,2 @@
+Done...
+ERROR: The script died unexpectedly.