--- a
+++ b/data/ref.fa
@@ -0,0 +1,4 @@
+>chr1
+TTAATCATGAAACCGTGGAGGCAAATCGGAGTGTAAGGCTTGACTGGATTCCTACGTTGCGTAGGTTCATGGGGGG
+>chr2
+AATTAGTACTTTGGCACCTCCGTTTAGCCTCACATTCCGAACTGACCTAAGGATGCAACGCATCCAAGTACCCCCC