fix tests testing for content of exception what strings

It was agreed to never do this. What strings are for display only and should not be analysed, neither by tests nor by applications.

tests/executables_src/testDeviceInitialisationHandler.cc

@@ -223,8 +223,7 @@ BOOST_AUTO_TEST_CASE(testInitialisationException) {
 
   CHECK_EQUAL_TIMEOUT(test.readScalar<int32_t>(ctk::RegisterPath("/Devices") / deviceCDD / "status"), 1, 10000);
   // First we see the message from the failing write
-  CHECK_EQUAL_TIMEOUT(test.readScalar<std::string>(ctk::RegisterPath("/Devices") / deviceCDD / "message"),
-      "DummyException: write throws by request", 10000);
+  BOOST_CHECK(test.readScalar<std::string>(ctk::RegisterPath("/Devices") / deviceCDD / "message") != "");
   dummyBackend->throwExceptionWrite = false;
   // Afterwards we see a message from the failing initialisation (which we can now distinguish from the original write exception because write does not throw any more)
   CHECK_EQUAL_TIMEOUT(

tests/executables_src/testExceptionHandling.cc

@@ -907,14 +907,12 @@ BOOST_AUTO_TEST_CASE(testShutdown) {
   // wait for the error to be reported in the control system
   CHECK_EQUAL_TIMEOUT(
       test.readScalar<int32_t>(ctk::RegisterPath("/Devices") / ExceptionDummyCDD2 / "status"), 1, 10000);
-  CHECK_EQUAL_TIMEOUT(test.readScalar<std::string>(ctk::RegisterPath("/Devices") / ExceptionDummyCDD2 / "message"),
-      "DummyException: read throws by request", 10000);
+  BOOST_CHECK(test.readScalar<std::string>(ctk::RegisterPath("/Devices") / ExceptionDummyCDD2 / "message") != "");
 
   auto theInt = test.getScalar<int32_t>("/Device2/Integers/signed32");
   theInt.write();
+  BOOST_CHECK(test.readScalar<std::string>(ctk::RegisterPath("/Devices") / ExceptionDummyCDD2 / "message") != "");
   // the read is the first error we see. The second one is not reported any more for this device.
-  CHECK_EQUAL_TIMEOUT(test.readScalar<std::string>(ctk::RegisterPath("/Devices") / ExceptionDummyCDD2 / "message"),
-      "DummyException: read throws by request", 10000);
 
   // device 2 successfully broken!
 
@@ -929,8 +927,7 @@ BOOST_AUTO_TEST_CASE(testShutdown) {
   CHECK_EQUAL_TIMEOUT(
       test.readScalar<int32_t>(ctk::RegisterPath("/Devices") / ExceptionDummyCDD1 / "status"), 1, 10000);
   // the write message does not have a \n, it is not going though a feeding fanout
-  CHECK_EQUAL_TIMEOUT(test.readScalar<std::string>(ctk::RegisterPath("/Devices") / ExceptionDummyCDD1 / "message"),
-      "DummyException: write throws by request", 10000);
+  BOOST_CHECK(test.readScalar<std::string>(ctk::RegisterPath("/Devices") / ExceptionDummyCDD1 / "message") != "");
 
   auto triggerReadback = test.getScalar<int32_t>("/triggerReadback");
   triggerReadback.write();
@@ -946,8 +943,7 @@ BOOST_AUTO_TEST_CASE(testShutdown) {
 
   CHECK_EQUAL_TIMEOUT(
       test.readScalar<int32_t>(ctk::RegisterPath("/Devices") / ExceptionDummyCDD3 / "status"), 1, 10000);
-  CHECK_EQUAL_TIMEOUT(test.readScalar<std::string>(ctk::RegisterPath("/Devices") / ExceptionDummyCDD3 / "message"),
-      "DummyException: read throws by request", 10000);
+  BOOST_CHECK(test.readScalar<std::string>(ctk::RegisterPath("/Devices") / ExceptionDummyCDD3 / "message") != "");
 
   auto reg4 = test.getScalar<int32_t>("/Device3/MODULE/REG4");
   reg4.write();