Make pytest run more reliable

Snakefile

@@ -103,7 +103,7 @@ BASE_BEDS = [basename(x) for x in BEDS]
 BASE_REFFLATS = [basename(x) for x in REFFLATS]
 
 
-def split_genome(ref, approx_n_chunks=100):
+def split_genome(ref, approx_n_chunks=2):
     """
     Split genome in chunks.
 

requirements.txt

@@ -2,3 +2,4 @@ snakemake>=5.2.0
 pyfaidx==0.5.0
 python>=3.5
 click
+drmaa

tests/test_integration_run.yml

@@ -3,8 +3,8 @@
     snakemake
     --use-singularity
     --singularity-prefix /tmp/singularity
-    --singularity-args ' --bind /tmp'
-    --jobs 10 -w 120
+    --singularity-args ' --cleanenv --bind /tmp'
+    --jobs 1 -w 120
     -r -p -s Snakefile
     --config
     REFERENCE=tests/data/ref.fa