diff --git a/Visibility_2/test/Visibility_2/data/test_simple_polygon_2.dat b/Visibility_2/test/Visibility_2/data/test_simple_polygon_2.dat
new file mode 100644
index 00000000000..05c4453be9f
--- /dev/null
+++ b/Visibility_2/test/Visibility_2/data/test_simple_polygon_2.dat
@@ -0,0 +1,17 @@
+# Test case 2 for simple polygons. See https://cgal.geometryfactory.com/CGAL/Members/wiki/Visibility/TestCases
+1 3
+1 3
+
+0
+4
+0 0 4 4
+4 4 8 4
+8 4 0 8
+0 8 0 0
+
+0
+4
+0 0 4 4
+4 4 6.4 4.8
+6.4 4.8 0 8
+0 8 0 0
diff --git a/Visibility_2/test/Visibility_2/data/test_simple_polygon_3.dat b/Visibility_2/test/Visibility_2/data/test_simple_polygon_3.dat
new file mode 100644
index 00000000000..932b304cb08
--- /dev/null
+++ b/Visibility_2/test/Visibility_2/data/test_simple_polygon_3.dat
@@ -0,0 +1,26 @@
+# Test case 3 for simple polygons. See https://cgal.geometryfactory.com/CGAL/Members/wiki/Visibility/TestCases
+2 2
+2 2
+
+0
+8
+0 0 13 0
+13 0 13 4
+13 4 11 2
+11 2 9 4
+9 4 7 2
+7 2 4 2
+4 2 0 5
+0 5 0 0
+
+0
+7
+0 0 13 0
+13 0 13 2
+13 2 11 2
+11 2 7 2
+7 2 4 2
+4 2 0 5
+0 5 0 0
+
+
diff --git a/Visibility_2/test/Visibility_2/data/test_simple_polygon_4.dat b/Visibility_2/test/Visibility_2/data/test_simple_polygon_4.dat
new file mode 100644
index 00000000000..2f1f05e8452
--- /dev/null
+++ b/Visibility_2/test/Visibility_2/data/test_simple_polygon_4.dat
@@ -0,0 +1,42 @@
+# Test case 4 for simple polygons. See https://cgal.geometryfactory.com/CGAL/Members/wiki/Visibility/TestCases
+6 4
+6 4
+
+0
+18
+0 0 3 2
+3 2 5 1
+5 1 8 1
+8 1 16 2
+16 2 16 5
+16 5 14 4
+14 4 12 7
+12 7 10 4
+10 4 8 4
+8 4 10 8
+10 8 9 10
+9 10 8 8
+8 8 6 8
+6 8 7 6
+7 6 1 6
+1 6 4 8
+4 8 0 9
+0 9 0 0
+
+0
+15
+0 0 3 2
+3 2 5 1
+5 1 8 1
+8 1 16 2
+16 2 16 4
+16 4 14 4
+14 4 10 4
+10 4 8 4
+8 4 10 8
+10 8 9 10
+9 10 8 8
+8 8 7 6
+7 6 1 6
+1 6 0 6.4
+0 6.4 0 0
diff --git a/Visibility_2/test/Visibility_2/data/test_simple_polygon_5.dat b/Visibility_2/test/Visibility_2/data/test_simple_polygon_5.dat
new file mode 100644
index 00000000000..114390d664d
--- /dev/null
+++ b/Visibility_2/test/Visibility_2/data/test_simple_polygon_5.dat
@@ -0,0 +1,37 @@
+# Test case 5 for simple polygons. See https://cgal.geometryfactory.com/CGAL/Members/wiki/Visibility/TestCases
+5 2
+5 2
+
+0
+20
+0 0 12 0
+12 0 12 2
+12 2 9 2
+9 2 9 4
+9 4 16 4
+16 4 16 0
+16 0 20 0
+20 0 20 12
+20 12 0 12
+0 12 0 8
+0 8 15 8
+15 8 15 9
+15 9 1 9
+1 9 1 11
+1 11 19 11
+19 11 19 1
+19 1 17 1
+17 1 17 6
+17 6 0 6
+0 6 0 0
+
+0
+7
+0 0 12 0
+12 0 12 2
+12 2 9 2
+9 2 9 4
+9 4 13 6
+13 6 0 6
+0 6 0 0
+