Improve "allow editing" tests

While making changes to the test suite, I ran into some issues with
these tests failing on occasion.

I added some setup and teardown to help with this.

But one thing I did notice is that the word "Upload" appears in the
response body whether uploading is enabled or not, so I made these
assertions more specific to the HTML rather than other places the word
"Upload" might appear (which is related to Critic Markup).

test/test_allow_editing.rb

@@ -7,15 +7,29 @@ context "Precious::Views::Editing" do
   setup do
     @path = cloned_testpath('examples/revert.git')
     Precious::App.set(:gollum_path, @path)
+    Precious::App.set(:wiki_options, {allow_editing: true, allow_uploads: true})
     @wiki = Gollum::Wiki.new(@path)
   end
 
   teardown do
+    Precious::App.set(:wiki_options, {allow_editing: true, allow_uploads: true})
     FileUtils.rm_rf(@path)
   end
 
+  test 'creating pages is not blocked' do
+    post '/gollum/create',
+      content: 'abc',
+      format: 'markdown',
+      message: 'def',
+      page: 'D'
+
+    assert_equal last_response.status, 302
+
+    refute_nil @wiki.page('D')
+  end
+
   test 'creating pages is blocked' do
-    Precious::App.set(:wiki_options, {allow_editing: false})
+    Precious::App.set(:wiki_options, {allow_editing: false, allow_uploads: false})
 
     post '/gollum/create',
       content: 'abc',
@@ -31,63 +45,62 @@ context "Precious::Views::Editing" do
   end
 
   test ".redirects.gollum file should not be accessible" do
-    Precious::App.set(:wiki_options, { allow_editing: true, allow_uploads: true })
     get '/.redirects.gollum'
     assert_match /Accessing this resource is not allowed/, last_response.body
   end
 
   test ".redirects.gollum file should not be editable" do
-    Precious::App.set(:wiki_options, { allow_editing: true, allow_uploads: true })
     get '/gollum/edit/.redirects.gollum'
     assert_match /Changing this resource is not allowed/, last_response.body
   end
 
   test "frontend links for editing are not blocked" do
-    Precious::App.set(:wiki_options, { allow_editing: true, allow_uploads: true })
     get '/A'
 
-    assert_match /Delete this Page/, last_response.body, "'Delete this Page' link is blocked in page template"
+    assert last_response.body.include? "Delete this Page"
-    assert_match /New/,              last_response.body, "'New' button is blocked in page template"
+    assert last_response.body.include? "New"
-    assert_match /Upload\b/,         last_response.body, "'Upload' link is blocked in page template"
+    assert last_response.body.include? "<span>Upload</span>"
-    assert_match /Rename/,           last_response.body, "'Rename' link is blocked in page template"
+    assert last_response.body.include? "Rename"
-    assert_match /Edit/,             last_response.body, "'Edit' link is blocked in page template"
+    assert last_response.body.include? "Edit"
 
     get '/gollum/overview'
 
-    assert_match /New/, last_response.body, "'New' link is blocked in pages template"
+    assert last_response.body.include? "New"
 
     get '/gollum/history/A'
 
-    refute_match /Edit/, last_response.body, "'Edit' link is not blocked in history template"
+    refute last_response.body.include? "Edit"
 
-    get '/gollum/compare/A/fc66539528eb96f21b2bbdbf557788fe8a1196ac..b26b791cb7917c4f37dd9cb4d1e0efb24ac4d26f'
+    get '/gollum/compare/A/fc665395..b26b791c'
 
-    refute_match /Edit Page/,             last_response.body, "'Edit Page' link is not blocked in compare template"
+    refute last_response.body.include? "Edit Page"
-    assert_match /Revert Changes/,        last_response.body, "'Revert Changes' link is blocked in compare template"
+
+    assert last_response.body.include? "Revert Changes"
   end
 
   test "frontend links for editing blocked" do
-    Precious::App.set(:wiki_options, { allow_editing: false })
+    Precious::App.set(:wiki_options, {allow_editing: false, allow_uploads: false})
+
     get '/A'
 
-    refute_match /Delete this Page/, last_response.body, "'Delete this Page' link not blocked in page template"
+    refute last_response.body.include? "Delete this Page"
-    refute_match /New/,              last_response.body, "'New' button not blocked in page template"
+    refute last_response.body.include? "<span>Upload</span>"
-    refute_match /Upload\b/,         last_response.body, "'Upload' link not blocked in page template"
+    refute last_response.body.include? "Rename"
-    refute_match /Rename/,           last_response.body, "'Rename' link not blocked in page template"
+    refute last_response.body.include? "Edit"
-    refute_match /Edit/,             last_response.body, "'Edit' link not blocked in page template"
+    refute last_response.body.include? "New"
 
     get '/gollum/overview'
 
-    refute_match /New/, last_response.body, "'New' link not blocked in pages template"
+    refute last_response.body.include? "New"
 
     get '/gollum/history/A'
 
-    refute_match /Edit/, last_response.body, "'Edit' link not blocked in history template"
+    refute last_response.body.include? "Edit"
 
-    get '/gollum/compare/A/fc66539528eb96f21b2bbdbf557788fe8a1196ac..b26b791cb7917c4f37dd9cb4d1e0efb24ac4d26f'
+    get '/gollum/compare/A/fc665395..b26b791c'
 
-    refute_match /Edit Page/,             last_response.body, "'Edit Page' link not blocked in compare template"
+    refute last_response.body.include? "Edit Page"
-    refute_match /Revert Changes/,        last_response.body, "'Revert Changes' link not blocked in compare template"
+    refute last_response.body.include? "Revert Changes"
   end
 
   def app