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+# Testing Tools
+
+## How to Check Compatibility Between Compilers
+
+Since the interfaces used in the cpp bridgetest are not changed often
+one can just build the `cppobj.uno.dll` and the `constructors.uno.dll`
+(`testtools/source/bridgetest`) in an
+old environment and then use them in the new environment. That is the files
+are copied into the `testtools/wntmsciXX.pro` folder which corresponds to the
+new environment.
+
+On Windows this test will typically fail because the tests use the
+`cppu::getCaughtException` function, which only works when all libs are build
+using the same runtime.
+
+This part of the test can switched off. To do this go into the
+`testtools/source/bridgetest` folder and call
+
+ dmake compcheck=1
+
+This will add a new compiler define (`-DCOMPCHECK`) and will be used in the
+`bridgetest.cxx` to switch off the code which uses the `getCaughtException` function.
+However, there is still a test which causes the test component to throw
+and `IllegalArgumentException`. This still works.
+
+
+## Using source / bridgetest for Stress Testing
+
+Start a modified `bridgetest_server` (with the final `--singleaccept` argument
+removed from the uno executable call) or a modified `bridgetest_javaserver` (with
+the final `singleaccept` argument replaced with `multi` in the java executable
+call), then start a modified `bridgetest_client` (with a final `stress` argument
+added to the uno executable call). The client will continuously establish
+connections to the server which are immediately destroyed again. The test will
+run forever, unless an error occurs.