vim-patch:8.1.2089: do not get a hint that $TEST_FILTER was active

Problem:    Do not get a hint that $TEST_FILTER was active.
Solution:   Mention $TEST_FILTER if no functions were executed.
https://github.com/vim/vim/commit/7b666c7883c905a0e1428b8bfa7ba062af2656e7

1 files changed, 12 insertions, 2 deletions

diff --git a/src/nvim/testdir/runtest.vim b/src/nvim/testdir/runtest.vim
index 9ffa02827f..8b5270baa9 100644
--- a/src/nvim/testdir/runtest.vim
+++ b/src/nvim/testdir/runtest.vim
@@ -246,11 +246,18 @@ func FinishTesting()
   endif
 
   if s:done == 0
-    let message = 'NO tests executed'
+    if s:filtered > 0
+      let message = "NO tests match $TEST_FILTER: '" .. $TEST_FILTER .. "'"
+    else
+      let message = 'NO tests executed'
+    endif
   else
+    if s:filtered > 0
+      call add(s:messages, "Filtered " .. s:filtered .. " tests with $TEST_FILTER")
+    endif
     let message = 'Executed ' . s:done . (s:done > 1 ? ' tests' : ' test')
   endif
-  if has('reltime')
+  if s:done > 0 && has('reltime')
     let message ..= ' in ' .. reltimestr(reltime(s:start_time)) .. ' seconds'
   endif
   echo message
@@ -339,8 +346,11 @@ endif
 
 " If the environment variable $TEST_FILTER is set then filter the function
 " names against it.
+let s:filtered = 0
 if $TEST_FILTER != ''
+  let s:filtered = len(s:tests)
   let s:tests = filter(s:tests, 'v:val =~ $TEST_FILTER')
+  let s:filtered -= len(s:tests)
 endif
 
 " Execute the tests in alphabetical order.