clearer organization for compiler tests

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

test/compiler/fragments/test_functions.rb

@@ -0,0 +1,43 @@
+require_relative 'helper'
+
+class TestFunctions < MiniTest::Test
+  include Fragments
+
+  def test_functions
+    @string_input = <<HERE
+class Object
+
+  int minus(int a,int b)
+      return a - b
+  end
+
+  int plus(int a, int b)
+    return a + b
+  end
+
+  int times(int a, int b)
+    if( b == 0 )
+      a = 0
+    else
+      int m = minus(b, 1)
+      int t = times(a, m)
+      a = plus(a,t)
+    end
+  end
+
+  int t_seven()
+    int tim = times(7,6)
+    tim.putint()
+  end
+
+  int main()
+    t_seven()
+  end
+end
+HERE
+  @expect =  [[Virtual::MethodEnter,Register::GetSlot,Virtual::Set,Virtual::Set,Virtual::MethodCall] ,
+          [Virtual::MethodReturn]]
+  check
+
+  end
+end