Test case for Fixnum rewrites

features/step_definitions/transform_steps.rb

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+$: << File.expand_path(File.dirname(__FILE__)+"/../..")
+
+require 'transform'
+
+# The rest is shared with the parser steps
+
+When(/^I preprocess it with the compiler transformations$/) do
+  Compiler.new.preprocess(@tree)
+end
+

features/transform.feature

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+
+Feature: Transformations
+  In order to implement the correct semantics, the compiler post-processes
+  the output from the Parser to modify the AST.
+
+  Scenario Outline: Simple expressions
+    Given the expression <expr>
+    When I parse it with the full parser
+    And I preprocess it with the compiler transformations
+    Then the parse tree should become <tree>
+
+    Examples:
+    | expr    | tree                                                                               | notes |
+    | "1 + 2" | [:do,[:add, [:sexp,[:call, :__get_fixnum, 1]], [:sexp,[:call, :__get_fixnum, 2]]]] |       |
+
+