Add in test peak calling step.

workflow/tests/test_call_peaks_macs.py

+#!/usr/bin/env python3
+
+import pytest
+import pandas as pd
+from io import StringIO
+import os
+import utils
+import call_peaks_macs
+
+test_output_path = os.path.dirname(os.path.abspath(__file__)) + \
+                '/../output/callPeaksMACS/'
+
+
+def test_call_peaks_macs_singleend():
+    assert os.path.exists(os.path.join(test_output_path, 'ENCLB144FDT.fc_signal.bw'))
+    assert os.path.exists(os.path.join(test_output_path, 'ENCLB144FDT.pvalue_signal.bw'))
+    peak_file = test_output_path + 'ENCLB144FDT_peaks.narrowPeak'
+    assert utils.count_lines(peak_file) == '210349'
+
+
+def test_call_peaks_macs_pairedend():
+    # Do the same thing for paired end data
+    pass