clearer organization for compiler tests

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

test/compiler/fragments/test_foo.rb

@@ -0,0 +1,25 @@
+require_relative 'helper'
+
+class TestFoo < MiniTest::Test
+  include Fragments
+
+  def test_foo2
+    @string_input = <<HERE
+class Object
+  int foo(int x)
+    int a = 5
+    return a
+  end
+
+  int main()
+    foo( 4 )
+  end
+end
+HERE
+    @expect =  [ [Virtual::MethodEnter,Register::GetSlot,Virtual::Set,Virtual::Set,
+                  Virtual::Set,Virtual::Set,Virtual::MethodCall] ,[Virtual::MethodReturn] ]
+    check
+  end
+
+
+end