Update tests for singular error messages

app/mutations/points/destroy.rb

@@ -1,8 +1,7 @@
 module Points
   class Destroy < Mutations::Command
     STILL_IN_USE   = "Could not delete the following item(s): %s. Item(s) are "\
-                     "in use by the following sequence(s): %s."
-
+                      "in use by the following sequence(s): %s."
     JUST_ONE       =  "Could not delete %s. Item is in use by the following "\
                       "sequence(s): %s."
 

spec/mutations/points/destroy_edge_cases_spec.rb

@@ -24,10 +24,10 @@ describe "Point deletion edge cases" do
             offset: { kind: "coordinate", args: { x: 0, y: 0, z: 0} }
           },
         }])
-    result   = Points::Destroy.run(point_ids: [tool_slot.id], device: device)
-    errors   = result.errors.message_list
-    expected = "Could not delete the following item(s): foo tool. Item(s) are "\
-               "in use by the following sequence(s): sequence."
+    result   =  Points::Destroy.run(point_ids: [tool_slot.id], device: device)
+    errors   =  result.errors.message_list
+    expected =  "Could not delete foo tool. Item is in use by the following "\
+                "sequence(s): sequence."
     expect(errors).to include(expected)
   end
 end

spec/mutations/points/destroy_spec.rb

@@ -48,9 +48,8 @@ describe Points::Destroy do
     point_ids = [s.tool_slot.id]
     result = Points::Destroy.run(point_ids: point_ids, device: s.device)
     expect(result.success?).to be(false)
-    expected  = "Could not delete the following item(s): Scenario Tool. "\
-                "Item(s) are in use by the following sequence(s): Scenario "\
-                "Sequence."
+    expected  = "Could not delete Scenario Tool. Item is in use by the "\
+                "following sequence(s): Scenario Sequence."
     expect(result.errors.message_list).to include(expected)
   end