Add test for runtime incompatible matrix/vector product

tests/test_CRSMatrix.cpp

@@ -6,8 +6,6 @@
 template class SparseMatrixDescriptor<int, uint8_t>;
 
 TEST_CASE("CRSMatrix", "[algebra]")
-{
-  SECTION("CRSMatrix")
 {
   SECTION("matrix size")
   {
@@ -128,5 +126,13 @@ TEST_CASE("CRSMatrix", "[algebra]")
     REQUIRE(y[2] == 110);
     REQUIRE(y[3] == 150);
   }
+
+#ifndef NDEBUG
+  SECTION("incompatible runtime matrix/vector product")
+  {
+    CRSMatrix<int, uint8_t> A{SparseMatrixDescriptor<int, uint8_t>{4}};
+    Vector<int> x{2};
+    REQUIRE_THROWS_AS(A * x, AssertError);
   }
+#endif   // NDEBUG
 }