add runtests.bat to 2.8 branch to allow running 2.8 unit tests in buildbot builds

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@59737 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/runtests.bat

@@ -0,0 +1,28 @@
+@echo off
+
+REM Runs wxWidgets CppUnit tests
+REM This script is used to return the correct return value to the caller
+REM which is required by Buildbot to recognize failures.
+REM $Id: runtests.bat 59695 2009-03-21 13:49:20Z FM $
+
+set failure=0
+
+for /d %%x in (*) do @(
+    if exist %%x\test.exe (
+        %%x\test.exe
+        if %errorlevel% GEQ 1 set failure=1
+    )
+    if exist %%x\test_gui.exe (
+        %%x\test_gui.exe
+        if %errorlevel% GEQ 1 set failure=1
+    )
+)
+
+REM exit with code 1 if any of the test failed
+if %failure% EQU 1 exit /b 1
+
+REM remove the failure env var:
+set failure=
+
+REM exit with code 0 (all tests passed successfully)
+exit /b 0