patch 9.0.1005: a failed test may leave a swap file behind

Problem:    A failed test may leave a swap file behind.
Solution:   Delete the swap file to avoid another test to fail.  Use another
            file name.
diff --git a/src/testdir/test_suspend.vim b/src/testdir/test_suspend.vim
index 1c6ebbc..ebefdd0 100644
--- a/src/testdir/test_suspend.vim
+++ b/src/testdir/test_suspend.vim
@@ -24,6 +24,9 @@
 
   call WaitForResponses()
 
+  " in case a previous failure left a swap file behind
+  call delete('.Xfoo.swp')
+
   let buf = term_start('/bin/sh')
   " Wait for shell prompt.
   call WaitForAssert({-> assert_match('[$#] $', term_getline(buf, '.'))})
@@ -62,6 +65,7 @@
 
   exe buf . 'bwipe!'
   call delete('Xfoo')
+  call delete('.Xfoo.swp')
 endfunc
 
 func Test_suspend_autocmd()
@@ -70,6 +74,9 @@
 
   call WaitForResponses()
 
+  " in case a previous failure left a swap file behind
+  call delete('.Xfoo.swp')
+
   let buf = term_start('/bin/sh', #{term_rows: 6})
   " Wait for shell prompt.
   call WaitForAssert({-> assert_match('[$#] $', term_getline(buf, '.'))})
@@ -108,6 +115,7 @@
 
   exe buf . 'bwipe!'
   call delete('Xfoo')
+  call delete('.Xfoo.swp')
 endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab