Check that the length of input and replicates is the same

defaults to replicates=1

pyclarity_lims/entities.py

@@ -875,7 +875,7 @@ def set_placements(self, output_containers, output_placement_list):
         self.placement.root = self.placement.post()
 
     @classmethod
-    def create(cls, lims, protocol_step, inputs, container_type_name=None, reagent_category=None, replicates=None, **kwargs):
+    def create(cls, lims, protocol_step, inputs, container_type_name=None, reagent_category=None, replicates=1, **kwargs):
         """
         Create a new instance of a Step. This method will start a step from queued artifacts.
 
@@ -913,6 +913,7 @@ def create(cls, lims, protocol_step, inputs, container_type_name=None, reagent_c
 
         if isinstance(replicates, int):
             replicates = [replicates] * len(inputs)
+        assert len(replicates) == len(inputs)
         inputs_node = ElementTree.SubElement(instance.root, 'inputs')
         for i, artifact in enumerate(inputs):
             if not isinstance(artifact, Artifact):

tests/test_entities.py

@@ -302,7 +302,8 @@ def test_create2(self):
         )
         with patch('pyclarity_lims.lims.requests.post',
                    return_value=Mock(content=self.step_xml, status_code=201)) as patch_post:
-            Step.create(self.lims, protocol_step=protocol_step, inputs=inputs, replicates=1)
+            # replicates default to 1
+            Step.create(self.lims, protocol_step=protocol_step, inputs=inputs)
             data = '''<?xml version='1.0' encoding='utf-8'?>
             <stp:step-creation xmlns:stp="http://genologics.com/ri/step">
                 <configuration uri="http://testgenologics.com:4040/api/v2/configuration//protocols/p1/steps/p1s1">