clearer organization for compiler tests

was slightly messy with small/large
now needed different test for expression and statements

test/compiler/fragments/test_putint.rb

@@ -0,0 +1,23 @@
+require_relative 'helper'
+
+class TestPutint < MiniTest::Test
+  include Fragments
+
+  def test_putint
+    @string_input = <<HERE
+class Integer
+  int putint()
+    return 1
+  end
+end
+class Object
+  int main()
+    42.putint()
+  end
+end
+HERE
+    @expect =  [ [Virtual::MethodEnter,Virtual::Set,Register::GetSlot,Virtual::Set,
+                  Virtual::Set,Virtual::MethodCall] ,[Virtual::MethodReturn] ]
+    check
+  end
+end