start to test call

as per tdd noticing logic errors, have to swap message out

test/mom/test_send_simple.rb

@@ -0,0 +1,52 @@
+require_relative "helper"
+
+module Risc
+  class TestCallSimple < MiniTest::Test
+    include Statements
+
+    def setup
+      super
+      @input = "5.mod4"
+      @expect = [LoadConstant, SlotToReg, RegToSlot, LoadConstant, SlotToReg, SlotToReg ,
+                 RegToSlot, LoadConstant, SlotToReg, SlotToReg, RegToSlot, LoadConstant ,
+                 SlotToReg, RegToSlot, LoadConstant, SlotToReg, RegToSlot, SlotToReg ,
+                 FunctionCall, Label]
+    end
+
+    def test_send_instructions
+      assert_nil msg = check_nil , msg
+    end
+    def test_function_call
+      produced = produce_body
+      assert_equal FunctionCall , produced.next(18).class
+      assert_equal :mod4 , produced.next(18).method.name
+    end
+    def test_load_label
+      produced = produce_body
+      assert_equal Label , produced.next(14).constant.known_object.class
+    end
+    def test_load_5
+      produced = produce_body
+      assert_equal 5 , produced.next(11).constant.known_object.value
+    end
+
+    def est_call_reg_setup
+      produced = produce_body
+      assert_equal produced.next(16).register , produced.next(17).register
+    end
+    def pest_nil_load
+      produced = produce_body
+      assert_equal Mom::NilConstant , produced.next(4).constant.known_object.class
+    end
+    def pest_nil_check
+      produced = produce_body
+      assert_equal produced.next(10) , produced.next(5).label
+    end
+
+    def pest_true_label
+      produced = produce_body
+      assert produced.next(6).name.start_with?("true_label")
+    end
+
+  end
+end