fix index clobbering and tighten some stuff up

test/test_markup.rb

@@ -7,10 +7,9 @@ context "Markup" do
     Grit::Repo.init_bare(@path)
     @wiki = Gollum::Wiki.new(@path)
 
-    commit = { :message => "Bilbo page",
-               :name => "Tom Preston-Werner",
-               :email => "tom@github.com" }
-    @wiki.write_page("Bilbo Baggins", :markdown, "a [[Bilbo Baggins]] b", commit)
+    @commit = { :message => "Add stuff",
+                :name => "Tom Preston-Werner",
+                :email => "tom@github.com" }
   end
 
   teardown do
@@ -18,8 +17,22 @@ context "Markup" do
   end
 
   test "page link" do
+    @wiki.write_page("Bilbo Baggins", :markdown, "a [[Bilbo Baggins]] b", @commit)
+
     page = @wiki.page("Bilbo Baggins")
     output = Gollum::Markup.new(page).render
     assert_equal %{<p>a <a href="Bilbo-Baggins">Bilbo Baggins</a> b</p>\n}, output
   end
+
+  test "image" do
+    index = @wiki.repo.index
+    index.add("alpha.jpg", "hi")
+    index.commit("Add alpha.jpg")
+
+    @wiki.write_page("Bilbo Baggins", :markdown, "a [[/alpha.jpg]] b", @commit)
+
+    page = @wiki.page("Bilbo Baggins")
+    output = Gollum::Markup.new(page).render
+    assert_equal %{<p>a <img src="alpha.jpg" /> b</p>\n}, output
+  end
 end

test/test_wiki.rb

@@ -31,6 +31,12 @@ context "Wiki page writing" do
     assert_equal "Gollum page", @wiki.repo.commits.first.message
     assert_equal "Tom Preston-Werner", @wiki.repo.commits.first.author.name
     assert_equal "tom@github.com", @wiki.repo.commits.first.author.email
+    assert @wiki.page("Gollum")
+
+    @wiki.write_page("Bilbo", :markdown, "# Bilbo", commit)
+    assert_equal 2, @wiki.repo.commits.size
+    assert @wiki.page("Bilbo")
+    assert @wiki.page("Gollum")
   end
 
   test "update_page" do