Create rspec test structure for build tests

spec/build_tests_spec.rb

@@ -0,0 +1,13 @@
+require 'fileutils'
+
+describe Rscons do
+  FileUtils.rm_rf('build_tests/test')
+  test_dirs = Dir['build_tests/*/']
+  test_dirs.each do |build_test_rel_path|
+    FileUtils.cp_r(build_test_rel_path, 'build_tests/test')
+    Dir.chdir('build_tests/test') do
+      instance_eval(File.read('spec.rb'))
+    end
+    FileUtils.rm_rf('build_tests/test')
+  end
+end

spec/spec_helper.rb

@@ -0,0 +1 @@
+require "rscons"