diff -r 627e1c99bcf1 -r a95423d37588 src/test/resources/test-sudoku
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/test/resources/test-sudoku	Tue Jul 28 13:48:59 2020 +0200
@@ -0,0 +1,9 @@
+_ 1 _ 9 _ _ 8 _ _
+_ _ _ _ _ 8 _ _ 4
+6 _ 5 _ _ _ 7 _ _
+_ 9 _ _ 6 _ _ _ 8
+_ _ _ 2 _ 7 _ _ _
+8 _ _ _ 3 _ _ 6 _
+_ _ 2 _ _ _ 5 _ 3
+1 _ _ 4 _ _ _ _ _
+_ _ 6 _ _ 2 _ 1 _