diff --git a/exercise-04-multiplication-table/test_data/0004_in.txt b/exercise-04-multiplication-table/test_data/0004_in.txt
new file mode 100644
index 0000000..3a2e3f4
--- /dev/null
+++ b/exercise-04-multiplication-table/test_data/0004_in.txt
@@ -0,0 +1 @@
+-1
diff --git a/exercise-04-multiplication-table/test_data/0004_out.txt b/exercise-04-multiplication-table/test_data/0004_out.txt
new file mode 100644
index 0000000..7e14875
--- /dev/null
+++ b/exercise-04-multiplication-table/test_data/0004_out.txt
@@ -0,0 +1,2 @@
+Rozsah:
+Nespravny vstup.