Prevent problems with different random values on older Boost versions

src/test/storm-dft/simulator/DftTraceGeneratorTest.cpp

@@ -175,12 +175,18 @@ namespace {
    
         // First random step
         double timebound = simulator.randomStep();
+#if BOOST_VERSION > 106400
+        // Older Boost versions yield different value
         EXPECT_FLOAT_EQ(timebound, 0.522079);
+#endif
         state = simulator.getCurrentState();
         EXPECT_FALSE(state->hasFailed(dft->getTopLevelIndex()));
-   
+
         timebound = simulator.randomStep();
+#if BOOST_VERSION > 106400
+        // Older Boost versions yield different value
         EXPECT_FLOAT_EQ(timebound, 0.9497214);
+#endif
         state = simulator.getCurrentState();
         EXPECT_TRUE(state->hasFailed(dft->getTopLevelIndex()));
     }

src/test/storm-dft/simulator/SamplingTest.cpp

@@ -6,9 +6,15 @@
 namespace {
 
     TEST(SamplingTest, SampleExponential) {
+#if BOOST_VERSION < 106400
+            // Boost changed implementation of exponential distribution
+            // -> different values are returned
+            GTEST_SKIP();
+            return;
+#endif
         boost::mt19937 gen(5u);
         storm::utility::ExponentialDistributionGenerator dist(5);
-        
+
         // Ensure that pseudo random numbers are the same on all machines
         double reference[] = {0.18241937154, 0.0522078772595, 0.0949721368604, 0.246869315378, 0.765000791199, 0.0177096648877, 0.225167598601, 0.23538530391, 1.01605360643, 0.138846355094};
         for (int i =0; i < 10; ++i) {