update argv arguments

workflow/tests/test_pool_and_psuedoreplicate.py

@@ -64,7 +64,7 @@ def test_check_controls_single(design_experiment_3):
 @pytest.mark.unit
 def test_single_rep(design_experiment_2):
     sys.argv.extend(['-d', design_experiment_2])
-    sys.argv.extend(['-p', true])
+    sys.argv.extend(['-p', 'true'])
     sys.argv.extend(['-c', 1.2])
     single_rep = pool_and_psuedoreplicate.main()