diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 00000000..b52778f7
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,5 @@
+script: "bundle exec rake test"
+rvm:
+  - 1.8.7
+  - 1.9.2
+  - rbx-2.0
diff --git a/Gemfile b/Gemfile
index c80ee369..fe867854 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,4 @@
 source "http://rubygems.org"
 
 gemspec
+gem "rake", "~> 0.9.2"
diff --git a/gollum.gemspec b/gollum.gemspec
index 8e7f7402..07e88cff 100644
--- a/gollum.gemspec
+++ b/gollum.gemspec
@@ -29,6 +29,7 @@ Gem::Specification.new do |s|
   s.add_dependency('mustache', [">= 0.11.2", "< 1.0.0"])
   s.add_dependency('sanitize', "~> 2.0.0")
   s.add_dependency('nokogiri', "~> 1.4")
+  s.add_dependency('redcarpet')
 
   s.add_development_dependency('RedCloth')
   s.add_development_dependency('mocha')
@@ -38,7 +39,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency('rack-test')
   s.add_development_dependency('wikicloth')
   s.add_development_dependency('rake')
-  s.add_development_dependency('redcarpet')
 
   # = MANIFEST =
   s.files = %w[
diff --git a/lib/gollum/git_access.rb b/lib/gollum/git_access.rb
index 21444f68..9fe5298e 100644
--- a/lib/gollum/git_access.rb
+++ b/lib/gollum/git_access.rb
@@ -28,13 +28,17 @@ module Gollum
     #
     # ref - a String Git reference (ex: "master")
     #
-    # Returns a String.
+    # Returns a String, or nil if the ref isn't found.
     def ref_to_sha(ref)
-      if sha?(ref)
-        ref
-      else
-        get_cache(:ref, ref) { ref_to_sha!(ref) }
-      end
+      ref = ref.to_s
+      return if ref.empty?
+      sha =
+        if sha?(ref)
+          ref
+        else
+          get_cache(:ref, ref) { ref_to_sha!(ref) }
+        end.to_s
+      sha.empty? ? nil : sha
     end
 
     # Public: Gets a recursive list of Git blobs for the whole tree at the
@@ -238,4 +242,4 @@ module Gollum
       path
     end
   end
-end
\ No newline at end of file
+end
diff --git a/lib/gollum/wiki.rb b/lib/gollum/wiki.rb
index 1cbb2f8b..9c37bc1f 100644
--- a/lib/gollum/wiki.rb
+++ b/lib/gollum/wiki.rb
@@ -525,11 +525,14 @@ module Gollum
     #
     # Returns a flat Array of Gollum::Page instances.
     def tree_list(ref)
-      sha    = @access.ref_to_sha(ref)
-      commit = @access.commit(sha)
-      tree_map_for(sha).inject([]) do |list, entry|
-        next list unless @page_class.valid_page_name?(entry.name)
-        list << entry.page(self, commit)
+      if sha = @access.ref_to_sha(ref)
+        commit = @access.commit(sha)
+        tree_map_for(sha).inject([]) do |list, entry|
+          next list unless @page_class.valid_page_name?(entry.name)
+          list << entry.page(self, commit)
+        end
+      else
+        []
       end
     end
 
diff --git a/test/helper.rb b/test/helper.rb
index bde85157..78189633 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -38,6 +38,12 @@ def commit_details
     :email   => "tom@github.com" }
 end
 
+def normal(text)
+  text.gsub!(' ', '')
+  text.gsub!("\n", '')
+  text
+end
+
 # test/spec/mini 3
 # http://gist.github.com/25455
 # chris@ozmm.org
diff --git a/test/test_markup.rb b/test/test_markup.rb
index ffe6364f..988a34d4 100644
--- a/test/test_markup.rb
+++ b/test/test_markup.rb
@@ -173,7 +173,7 @@ context "Markup" do
     @wiki.write_page("Potato", :mediawiki, "a [[Potato|Potato Heaad]] ", commit_details)
     page = @wiki.page("Potato")
     output = page.formatted_data
-    assert_equal "<p>\na <a class=\"internal present\" href=\"/Potato\">Potato Heaad</a> </p>", output
+    assert_equal normal("<p>\na <a class=\"internal present\" href=\"/Potato\">Potato Heaad</a> </p>"), normal(output)
   end
 
   #########################################################################
@@ -476,8 +476,8 @@ context "Markup" do
   test "id prefix added" do
     content = "h2(#foo). xxxx[1]\n\nfn1.footnote"
     output = "<h2 id=\"wiki-foo\">xxxx" +
-             "<sup class=\"footnote\"><a href=\"#wiki-fn1\">1</a></sup></h2>" +
-             "\n<p class=\"footnote\" id=\"wiki-fn1\"><sup>1</sup> footnote</p>"
+             "<sup class=\"footnote\" id=\"wiki-fnr1\"><a href=\"#wiki-fn1\">1</a></sup></h2>" +
+             "\n<p class=\"footnote\" id=\"wiki-fn1\"><a href=\"#wiki-fnr1\"><sup>1</sup></a> footnote</p>"
     compare(content, output, :textile)
   end
 
@@ -513,7 +513,7 @@ context "Markup" do
     page = @wiki.page("Bilbo Baggins")
     rendered = Gollum::Markup.new(page).render
     if regexes.empty?
-      assert_equal output, rendered
+      assert_equal normal(output), normal(rendered)
     else
       regexes.each { |r| assert_match r, output }
     end
@@ -528,6 +528,6 @@ context "Markup" do
     @wiki.clear_cache
     page = @wiki.page("Bilbo Baggins")
     rendered = Gollum::Markup.new(page).render
-    assert_equal output, rendered
+    assert_equal normal(output), normal(rendered)
   end
 end