Added validations to edit_web (it could overwrite parameters of an existing Wiki before)

test/functional/wiki_controller_test.rb

@@ -131,7 +131,7 @@ class WikiControllerTest < Test::Unit::TestCase
     end
 
   else
-    puts 'Warning: tests involving pdflatex are very slow, therefore they are disable by default.'
+    puts 'Warning: tests involving pdflatex are very slow, therefore they are disabled by default.'
     puts '         Set environment variable INSTIKI_TEST_PDFLATEX or global Ruby variable'
     puts '         $INSTIKI_TEST_PDFLATEX to enable them.'
   end

test/unit/wiki_service_test.rb

@@ -69,6 +69,19 @@ class WikiServiceTest < Test::Unit::TestCase
     assert_equal(@s.storage_path + '/instiki', file_yard.files_path)
   end
 
+  def test_edit_web_validations
+    another_web = @s.create_web 'Another', 'another'
+    
+    # try to rename instiki web to another (which is the name of an already existing one)
+    assert_raises(Instiki::ValidationError) {
+      @s.edit_web('instiki', 'another', @web.name, @web.markup, @web.color, @web.additional_style)
+    }
+
+    assert_raises(Instiki::ValidationError) {
+      @s.edit_web('nonexistant', 'another', @web.name, @web.markup, @web.color, @web.additional_style)
+    }
+  end
+
 
   # Checks that a method call or a block doesn;t change the persisted state of the wiki
   # Usage: