Add new test for regex matches outlined in TemmplateDigestor

This includes failing test for rails#17.

Author: latortuga

test/render_dependency_matcher_test.rb

@@ -0,0 +1,45 @@
+require 'cache_digests/test_helper'
+require 'fileutils'
+
+class RenderDependencyMatcherTest < MiniTest::Unit::TestCase
+  def test_matches_render_partial
+    assert_matched "render partial: \"comments/comment\", collection: commentable.comments"
+  end
+
+  def test_matches_render_no_partial_double_quote
+    assert_matched "render \"comments/comments\""
+  end
+
+  def test_matches_render_no_partial_single_quote
+    assert_matched "render 'comments/comments'"
+  end
+
+  def test_matches_render_no_partial_single_quote_in_parens
+    assert_matched "render('comments/comments')"
+  end
+
+  def test_matches_render_with_instance_var
+    assert_matched "render(@topic)"
+  end
+
+  def test_matches_render_with_local_var
+    assert_matched "render(topics)"
+  end
+
+  def test_misses_string_rendered
+    assert_misses "rendered"
+  end
+
+  private
+    def matcher
+      CacheDigests::TemplateDigestor::RENDER_DEPENDENCY
+    end
+
+    def assert_matched(str)
+      assert str =~ matcher, "Should have matched #{str} but didn't."
+    end
+
+    def assert_misses(str)
+      assert str !~ matcher, "Matched #{str} but should not have."
+    end
+end