fix syntax.

workflow/tests/test_experiment_qc.py

@@ -9,14 +9,13 @@ import experiment_qc
 test_output_path = os.path.dirname(os.path.abspath(__file__)) + \
                 '/../output/experimentQC/'
 
-DESIGN_STRING = """sample_id\texperiment_id\tbiosample\tfactor\ttreatment\treplicate\tbam_reads
+DESIGN_STRING = r"""sample_id\texperiment_id\tbiosample\tfactor\ttreatment\treplicate\bam_reads
 A_1\tA\tLiver\None\tNone\t1\tA_1.bam
 A_2\tA\tLiver\None\tNone\t2\tA_2.bam
 B_1\tB\tLiver\None\tNone\t1\tB_1.bam
 B_2\tB\tLiver\None\tNone\t2\tB_2.bam
 """
 
-
 @pytest.fixture
 def design_bam():
     design_file = StringIO(DESIGN_STRING)