test cases result covering warnings by b01ec030e9191af6

# filter all cases - simulate *nix using `-match "nothing"`:

> win\build\Release\tclsh86.exe tests\all.tcl -file winPipe.test -match "nothing" -debug 1 -tmpdir %TEMP%
Tests running in interp:  D:/Projects/tcl8.6-upstream/win/build/Release/tclsh86.exe
Tests located in:  D:/Projects/tcl8.6-upstream/tests
Tests running in:  D:/Projects/tcl8.6-upstream
Temporary files stored in C:/Temp
Test files run in separate interpreters
Running tests that match:  nothing
Skipping test files that match:  l.*.test
Only running test files that match:  winPipe.test
Tests began at Tue Oct 09 18:49:18 +0200 2018
winPipe.test

Tests ended at Tue Oct 09 18:49:18 +0200 2018
all.tcl:        Total   56      Passed  0       Skipped 56      Failed  0
Sourced 1 Test Files.
Number of tests skipped for each constraint:
        56      userSpecifiedNonMatch
No test directories remain after applying match and skip patterns!

# max stage of expansion (all files/dirs created now):

> win\build\Release\tclsh86.exe tests\all.tcl -file winPipe.test -debug 1 -tmpdir %TEMP% -constraint slowTest
Tests running in interp:  D:/Projects/tcl8.6-upstream/win/build/Release/tclsh86.exe
Tests located in:  D:/Projects/tcl8.6-upstream/tests
Tests running in:  D:/Projects/tcl8.6-upstream
Temporary files stored in C:/Temp
Test files run in separate interpreters
Running tests that match:  *
Skipping test files that match:  l.*.test
Only running test files that match:  winPipe.test
Tests began at Tue Oct 09 18:49:26 +0200 2018
winPipe.test

Tests ended at Tue Oct 09 18:49:37 +0200 2018
all.tcl:        Total   56      Passed  28      Skipped 28      Failed  0
Sourced 1 Test Files.
Number of tests skipped for each constraint:
        23      cat32
        1       knownBug
        4       testexcept
No test directories remain after applying match and skip patterns!