clearer organization for compiler tests

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

test/compiler/expressions/compiler_helper.rb

@@ -0,0 +1,31 @@
+require_relative '../../helper'
+require 'parslet/convenience'
+
+Phisol::Compiler.class_eval do
+  def set_main main
+    @clazz = Virtual.machine.space.get_class_by_name :Object
+    @method = main
+  end
+end
+
+module CompilerHelper
+
+  def set_main compiler
+    compiler.set_main Virtual.machine.space.get_main
+  end
+  def check
+    machine = Virtual.machine
+    machine.boot unless machine.booted
+    parser = Parser::Salama.new
+    parser = parser.send @root
+    syntax  = parser.parse_with_debug(@string_input)
+    parts = Parser::Transform.new.apply(syntax)
+    #puts parts.inspect
+    compiler = Phisol::Compiler.new
+    set_main(compiler)
+    produced = compiler.process( parts )
+    assert @output , "No output given"
+    assert_equal  produced.class, @output , "Wrong class"
+  end
+
+end