patch 8.0.0462: failure of an MS-Windows test may go unnoticed commit https://github.com/vim/vim/commit/b27523ff7ab3083c20c0f33415d890f978726c4f Author: Bram Moolenaar <Bram@vim.org> Date: Thu Mar 16 14:04:51 2017 +0100 patch 8.0.0462: failure of an MS-Windows test may go unnoticed Problem: If an MS-Windows tests succeeds at first and then fails in a way it does not produce a test.out file it looks like the test succeeded. Solution: Delete the previous output file.

--- a/src/testdir/Make_dos.mak
+++ b/src/testdir/Make_dos.mak
@@ -44,6 +44,7 @@ win32:	nolog $(SCRIPTS_FIRST) $(SCRIPTS)
 # This moves test99.in to test99.in.bak temporarily.
 $(TEST_OUTFILES): $(DOSTMP)\$(*B).in
 	-@if exist test.out DEL test.out
+	-@if exist $(DOSTMP)\$(*B).out DEL $(DOSTMP)\$(*B).out
 	move $(*B).in $(*B).in.bak > nul
 	copy $(DOSTMP)\$(*B).in $(*B).in > nul
 	copy $(*B).ok test.ok > nul