Add test to ensure MuEditor is removed when flag is off (#359)

src/.gitignore

@@ -4,7 +4,6 @@
 /*.dat
 *.sdf
 .tmp/
-.tmp\
 *.bak
 *.sbr
 *.tlog

tests/CMakeLists.txt

@@ -51,3 +51,5 @@ function(mu_add_test)
 endfunction()
 
 add_subdirectory(text)
+
+add_subdirectory(editor)

tests/editor/CMakeLists.txt

@@ -0,0 +1,20 @@
+ # Editor-specific tests only.
+ # Shared test harness setup (doctest include, wine setup, mu_test_main,
+ # and mu_add_test) must remain in the top-level tests/CMakeLists.txt.
+
+# Add Editor Leak Test (only runs when ENABLE_EDITOR is OFF)
+if(NOT ENABLE_EDITOR)
+    # Generate a text file containing all sources of the Main target
+    file(GENERATE
+        OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/main_sources.txt"
+        CONTENT "$<JOIN:$<TARGET_PROPERTY:Main,SOURCES>,\n>")
+
+    # Add a test that runs a Python script to verify MuEditor isn't in those sources
+    find_package(Python3 COMPONENTS Interpreter QUIET)
+    if(Python3_Interpreter_FOUND)
+         add_test(NAME test_editor_leak
+                   COMMAND Python3::Interpreter ${CMAKE_CURRENT_SOURCE_DIR}/test_leak.py "${CMAKE_CURRENT_BINARY_DIR}/main_sources.txt")
+    else()
+         message(STATUS "Skipping test_editor_leak: Python3 interpreter not found")
+    endif()
+endif()

tests/editor/test_leak.py

@@ -0,0 +1,28 @@
+import sys
+
+def main():
+    if len(sys.argv) < 2:
+        print("Usage: test_leak.py <sources_file>")
+        sys.exit(1)
+
+    sources_file = sys.argv[1]
+
+    with open(sources_file, 'r', encoding='utf-8') as f:
+        sources = f.read().splitlines()
+
+    # Normalise to forward slashes so the path-segment check is
+    # platform-independent and won't fire just because the repository
+    # happens to be cloned inside a directory called "MuEditor".
+    leaked_files = [s for s in sources if '/MuEditor/' in s.replace('\\', '/')]
+
+    if leaked_files:
+        print("FAIL: MuEditor leaked into the build! The following editor files were found in the Main target sources:")
+        for f in leaked_files:
+            print(f"  - {f}")
+        sys.exit(1)
+    else:
+        print("PASS: No MuEditor files leaked into the build.")
+        sys.exit(0)
+
+if __name__ == '__main__':
+    main()