diff --git a/day03/data/test-data.txt b/day03/data/test-data.txt
new file mode 100644
index 0000000..a6366a8
--- /dev/null
+++ b/day03/data/test-data.txt
@@ -0,0 +1,12 @@
+00100
+11110
+10110
+10111
+10101
+01111
+00111
+11100
+10000
+11001
+00010
+01010