move the methods test to mains

previous commit made the mains tests more general
this joins methods tests here
so we can run them on arm too
fix #11

test/mains/source/while__0.rb

@@ -0,0 +1,9 @@
+class Space
+  def main(arg)
+    b = 10
+    while( b >= 1 )
+      b = b - 1
+    end
+    return b
+  end
+end