diff --git a/tests/test_seq/empty_fasta.fna b/tests/test_seq/empty_fasta.fna
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_seq/empty_fasta_with_id.fna b/tests/test_seq/empty_fasta_with_id.fna
new file mode 100644
index 0000000..d9e80f6
--- /dev/null
+++ b/tests/test_seq/empty_fasta_with_id.fna
@@ -0,0 +1 @@
+>
diff --git a/tests/test_seq/not_fasta_file.fna b/tests/test_seq/not_fasta_file.fna
new file mode 100644
index 0000000..29ae49b
--- /dev/null
+++ b/tests/test_seq/not_fasta_file.fna
@@ -0,0 +1,2 @@
+hskv
+akh