Add MISSING_PARAM const

app/lib/celery_script/checker.rb

@@ -16,6 +16,7 @@ module CeleryScript
                "Expected one of: %s"
     T_MISMATCH = "Type mismatch. %s must be one of: %s. Got: %s"
     MISSING_VAR = "You must select a Location for the Location Variable."
+    MISSING_PARAM = "You must select a Default Value for the Location Variable."
 
     # Certain CeleryScript pairing errors are more than just a syntax error.
     # For instance, A `nothing` node in a `parameter_declaration` is often an
@@ -26,7 +27,7 @@ module CeleryScript
       nothing: {
         write_pin: "You must select a Peripheral in the Control Peripheral step.",
         variable_declaration: MISSING_VAR,
-        parameter_declaration: MISSING_VAR,
+        parameter_declaration: MISSING_PARAM,
         read_pin: "You must select a Sensor in the Read Sensor step.",
         move_absolute: "You must select a Location in the Move To step.",
         execute: CeleryScriptSettingsBag::NO_SUB_SEQ,

spec/controllers/api/sequences/sequences_create_spec.rb

@@ -374,7 +374,7 @@ describe Api::SequencesController do
                body: [] }
       post :create, body: input.to_json, params: { format: :json }
       expect(response.status).to eq(422)
-      expect(json[:body]).to include(CeleryScript::Checker::MISSING_VAR)
+      expect(json[:body]).to include(CeleryScript::Checker::MISSING_PARAM)
     end
   end
 end

spec/lib/celery_script/checker_spec.rb

@@ -293,6 +293,6 @@ describe CeleryScript::Checker do
     chk = CeleryScript::Checker.new(tree, corpus, device)
     expect(chk.valid?).to be false
     message = "must provide a value for all parameters"
-    expect(chk.error.message).to include(CeleryScript::Checker::MISSING_VAR)
+    expect(chk.error.message).to include(CeleryScript::Checker::MISSING_PARAM)
   end
 end