Added tests for cycles and SEQ children

resources/examples/testfiles/dft/cyclic.dft

@@ -0,0 +1,5 @@
+toplevel "A";
+"A" and "B";
+"B" and "C";
+"C" and "A" "D";
+"D" lambda=0.5 dorm=0.3;

resources/examples/testfiles/dft/seqChild.dft

@@ -0,0 +1,5 @@
+toplevel "A";
+"A" and "B" "X";
+"X" seq "B" "C";
+"B" lambda=0.5 dorm=0.3;
+"C" lambda=0.5 dorm=0.3;

src/test/storm-dft/api/DftParserTest.cpp

@@ -20,4 +20,14 @@ namespace {
         EXPECT_EQ(2ul, dft->nrBasicElements());
         EXPECT_TRUE(storm::api::isWellFormed(*dft));
     }
+
+    TEST(DftParserTest, CatchCycles) {
+        std::string file = STORM_TEST_RESOURCES_DIR "/dft/cyclic.dft";
+        EXPECT_THROW(storm::api::loadDFTGalileoFile<double>(file), storm::exceptions::WrongFormatException);
+    }
+
+    TEST(DftParserTest, CatchSeqChildren) {
+        std::string file = STORM_TEST_RESOURCES_DIR "/dft/seqChild.dft";
+        EXPECT_THROW(storm::api::loadDFTGalileoFile<double>(file), storm::exceptions::WrongFormatException);
+    }
 }