diff --git a/Solver/TESTCASES/Advection1D.lua b/Solver/TESTCASES/Advection1D.lua
index c85e108ecd4283ede81809fc9ef54b65a0787714..f472e9d558b041590acea174740168442c7b4a75 100644
--- a/Solver/TESTCASES/Advection1D.lua
+++ b/Solver/TESTCASES/Advection1D.lua
@@ -44,8 +44,8 @@ dg:exportSolution('output/Adv1D_00000')
 
 -- main loop
 n = 5
-for i=1,100*n do
-  norm = dg:RK44(0.03)
+for i=1,50*n do
+  norm = dg:RK44(0.0325)
   if (i % n == 0) then 
     print('iter',i,norm)
     dg:exportSolution(string.format("output/Adv1D-%05d", i)) 
diff --git a/Solver/TESTCASES/edge.geo b/Solver/TESTCASES/edge.geo
new file mode 100644
index 0000000000000000000000000000000000000000..67fd0dd7606e733ac923171169baed210f1b35e3
--- /dev/null
+++ b/Solver/TESTCASES/edge.geo
@@ -0,0 +1,6 @@
+Point(1) = {-1, 0, 0, 0.01};
+Point(2) = {1, 0, 0, 0.01};
+Line(1) = {1, 2};
+Physical Point("Left") = {1};
+Physical Point("Right") = {2};
+Physical Line("Line") = {1};