{-# LANGUAGE DataKinds           #-}
{-# LANGUAGE FlexibleInstances   #-}
{-# LANGUAGE OverloadedLists     #-}
{-# LANGUAGE OverloadedStrings   #-}
{-# LANGUAGE QuasiQuotes         #-}
{-# LANGUAGE ScopedTypeVariables #-}
-- {{{ Imports
import           Text.RSS.Conduit.Parse          as Parser
import           Text.RSS.Conduit.Render         as Renderer
import           Text.RSS.Extensions
import           Text.RSS.Extensions.Atom
import           Text.RSS.Extensions.Content
import           Text.RSS.Extensions.DublinCore
import           Text.RSS.Extensions.Syndication
import           Text.RSS.Lens
import           Text.RSS.Types
import           Text.RSS1.Conduit.Parse         as Parser

import           Conduit
import           Control.Exception.Safe          as Exception
import           Control.Monad
import           Control.Monad.Trans.Resource
import           Data.Char
import           Data.Conduit
import           Data.Conduit.List
import           Data.Default
import           Data.Maybe
import           Data.String
import qualified Data.Text.Lazy.Encoding         as Lazy
import           Data.Time.Calendar              hiding (DayOfWeek (..))
import           Data.Time.LocalTime
import           Data.Version
import           Data.Void
import           Data.XML.Types
import           Lens.Simple
import           System.FilePath
import           System.IO
import           System.Timeout
import           Test.Tasty
import           Test.Tasty.Golden               (findByExtension, goldenVsString)
import           Test.Tasty.HUnit
import           Text.Atom.Conduit.Parse
import           Text.Atom.Types
import           Text.XML.Stream.Parse           as XML hiding (choose)
import           Text.XML.Stream.Render
import           URI.ByteString
import           URI.ByteString.QQ
-- }}}

main :: IO ()
main = do
  goldenTests <- genGoldenTests
  defaultMain $ testGroup "Tests"
    [ unitTests
    , goldenTests
    ]

unitTests :: TestTree
unitTests = testGroup "Unit tests"
  [ skipHoursCase
  , skipDaysCase
  , rss1TextInputCase
  , rss2TextInputCase
  , rss1ImageCase
  , rss2ImageCase
  , categoryCase
  , cloudCase
  , guidCase
  , enclosureCase
  , sourceCase
  , rss1ItemCase
  , rss2ItemCase1
  , rss2ItemCase2
  , rss1ChannelItemsCase
  , rss1DocumentCase
  , dublinCoreChannelCase
  , dublinCoreItemCase
  , contentItemCase
  , syndicationChannelCase
  , atomChannelCase
  , multipleExtensionsCase
  ]

genGoldenTests :: IO TestTree
genGoldenTests = do
  xmlFiles <- findByExtension [".xml"] "."

  return $ testGroup "RSS golden tests" $ do
    xmlFile <- xmlFiles
    let goldenFile = addExtension xmlFile ".golden"
        f file = fmap (Lazy.encodeUtf8 . fromString . show) $ runResourceT $ runConduit $ sourceFile file .| Conduit.decodeUtf8C .| XML.parseText' def .| parser
        parser = rssDocument :: MonadThrow m => ConduitM Event o m (Maybe (RssDocument NoExtensions))

    return $ goldenVsString xmlFile goldenFile $ f xmlFile


skipHoursCase :: TestTree
skipHoursCase = testCase "<skipHours> element" $ do
  result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| force "ERROR" rssSkipHours
  result @?= [Hour 0, Hour 9, Hour 18, Hour 21]
  where input = [ "<skipHours>"
                , "<hour>21</hour>"
                , "<hour>9</hour>"
                , "<hour>0</hour>"
                , "<hour>18</hour>"
                , "<hour>9</hour>"
                , "</skipHours>"
                ]

skipDaysCase :: TestTree
skipDaysCase = testCase "<skipDays> element" $ do
  result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| force "ERROR" rssSkipDays
  result @?= [Monday, Saturday, Friday]
  where input = [ "<skipDays>"
                , "<day>Monday</day>"
                , "<day>Monday</day>"
                , "<day>Friday</day>"
                , "<day>Saturday</day>"
                , "</skipDays>"
                ]

rss1TextInputCase :: TestTree
rss1TextInputCase = testCase "RSS1 <textinput> element" $ do
  result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| force "ERROR" rss1TextInput
  result^.textInputTitleL @?= "Search XML.com"
  result^.textInputDescriptionL @?= "Search XML.com's XML collection"
  result^.textInputNameL @?= "s"
  result^.textInputLinkL @=? RssURI [uri|http://search.xml.com|]
  where input = [ "<textinput xmlns=\"http://purl.org/rss/1.0/\" xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\" rdf:about=\"http://search.xml.com\">"
                , "<title>Search XML.com</title>"
                , "<description>Search XML.com's XML collection</description>"
                , "<name>s</name>"
                , "<link>http://search.xml.com</link>"
                , "</textinput>"
                ]

rss2TextInputCase :: TestTree
rss2TextInputCase = testCase "RSS2 <textInput> element" $ do
  result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| force "ERROR" rssTextInput
  result^.textInputTitleL @?= "Title"
  result^.textInputDescriptionL @?= "Description"
  result^.textInputNameL @?= "Name"
  result^.textInputLinkL @=? RssURI [uri|http://link.ext|]
  where input = [ "<textInput>"
                , "<title>Title</title>"
                , "<description>Description</description>"
                , "<name>Name</name>"
                , "<link>http://link.ext</link>"
                , "</textInput>"
                ]

rss1ImageCase :: TestTree
rss1ImageCase = testCase "RSS1 <image> element" $ do
  result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| force "ERROR" rss1Image
  result^.imageUriL @?= RssURI [uri|http://xml.com/universal/images/xml_tiny.gif|]
  result^.imageTitleL @?= "XML.com"
  result^.imageLinkL @?= RssURI [uri|http://www.xml.com|]
  where input = [ "<image xmlns=\"http://purl.org/rss/1.0/\" xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\" rdf:about=\"http://xml.com/universal/images/xml_tiny.gif\">"
                , "<url>http://xml.com/universal/images/xml_tiny.gif</url>"
                , "<title>XML.com</title>"
                , "<ignored>Ignored</ignored>"
                , "<link>http://www.xml.com</link>"
                , "<ignored>Ignored</ignored>"
                , "</image>"
                ]

rss2ImageCase :: TestTree
rss2ImageCase = testCase "RSS2 <image> element" $ do
  result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| force "ERROR" rssImage
  result^.imageUriL @?= RssURI [uri|http://image.ext|]
  result^.imageTitleL @?= "Title"
  result^.imageLinkL @?= RssURI [uri|http://link.ext|]
  result^.imageWidthL @?= Just 100
  result^.imageHeightL @?= Just 200
  result^.imageDescriptionL @?= "Description"
  where input = [ "<image>"
                , "<url>http://image.ext</url>"
                , "<title>Title</title>"
                , "<ignored>Ignored</ignored>"
                , "<link>http://link.ext</link>"
                , "<width>100</width>"
                , "<height>200</height>"
                , "<description>Description</description>"
                , "<ignored>Ignored</ignored>"
                , "</image>"
                ]

categoryCase :: TestTree
categoryCase = testCase "<category> element" $ do
  result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| force "ERROR" rssCategory
  result @?= RssCategory "Domain" "Name"
  where input = [ "<category domain=\"Domain\">"
                , "Name"
                , "</category>"
                ]

cloudCase :: TestTree
cloudCase = testCase "<cloud> element" $ do
  result1:result2:_ <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| XML.many rssCloud
  result1 @?= RssCloud uri "pingMe" ProtocolSoap
  result2 @?= RssCloud uri "myCloud.rssPleaseNotify" ProtocolXmlRpc
  where input = [ "<cloud domain=\"rpc.sys.com\" port=\"80\" path=\"/RPC2\" registerProcedure=\"pingMe\" protocol=\"soap\"/>"
                , "<cloud domain=\"rpc.sys.com\" port=\"80\" path=\"/RPC2\" registerProcedure=\"myCloud.rssPleaseNotify\" protocol=\"xml-rpc\" />"
                ]
        uri = RssURI [relativeRef|//rpc.sys.com:80/RPC2|]

guidCase :: TestTree
guidCase = testCase "<guid> element" $ do
  result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| XML.many rssGuid
  result @?= [GuidUri uri, GuidText "1", GuidText "2"]
  where input = [ "<guid isPermaLink=\"true\">//guid.ext</guid>"
                , "<guid isPermaLink=\"false\">1</guid>"
                , "<guid>2</guid>"
                ]
        uri = RssURI [relativeRef|//guid.ext|]

enclosureCase :: TestTree
enclosureCase = testCase "<enclosure> element" $ do
  result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| force "ERROR" rssEnclosure
  result @?= RssEnclosure url 12216320 "audio/mpeg"
  where input = [ "<enclosure url=\"http://www.scripting.com/mp3s/weatherReportSuite.mp3\" length=\"12216320\" type=\"audio/mpeg\" />"
                ]
        url = RssURI [uri|http://www.scripting.com/mp3s/weatherReportSuite.mp3|]

sourceCase :: TestTree
sourceCase = testCase "<source> element" $ do
  result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| force "ERROR" rssSource
  result @?= RssSource url "Tomalak's Realm"
  where input = [ "<source url=\"http://www.tomalak.org/links2.xml\">Tomalak's Realm</source>"
                ]
        url = RssURI [uri|http://www.tomalak.org/links2.xml|]

rss1ItemCase :: TestTree
rss1ItemCase = testCase "RSS1 <item> element" $ do
  Just result <- runResourceT $ runConduit $ sourceList input .| XML.parseText' def .| rss1Item
  result^.itemTitleL @?= "Processing Inclusions with XSLT"
  result^.itemLinkL @?= Just link
  result^.itemDescriptionL @?= "Processing document inclusions with general XML tools can be problematic. This article proposes a way of preserving inclusion information through SAX-based processing."
  result^.itemExtensionsL @?= NoItemExtensions
  where input = [ "<item xmlns=\"http://purl.org/rss/1.0/\""
                , "xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\""
                , "xmlns:dc=\"http://purl.org/dc/elements/1.1/\""
                , "rdf:about=\"http://xml.com/pub/2000/08/09/xslt/xslt.html\" >"
                , "<title>Processing Inclusions with XSLT</title>"
                , "<description>Processing document inclusions with general XML tools can be"
                , " problematic. This article proposes a way of preserving inclusion"
                , " information through SAX-based processing."
                , "</description>"
                , "<link>http://xml.com/pub/2000/08/09/xslt/xslt.html</link>"
                , "<sometag>Some content in unknown tag, should be ignored.</sometag>"
                , "</item>"
                ]
        link = RssURI [uri|http://xml.com/pub/2000/08/09/xslt/xslt.html|]

rss2ItemCase1 :: TestTree
rss2ItemCase1 = testCase "RSS2 <item> element 1" $ do
  result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| force "ERROR" rssItem
  result^.itemTitleL @?= "Example entry"
  result^.itemLinkL @?= Just link
  result^.itemDescriptionL @?= "Here is some text containing an interesting description."
  result^.itemGuidL @?= Just (GuidText "7bd204c6-1655-4c27-aeee-53f933c5395f")
  result^.itemExtensionsL @?= NoItemExtensions
  isJust (result^.itemPubDateL) @?= True
  where input = [ "<item>"
                , "<title>Example entry</title>"
                , "<description>Here is some text containing an interesting description.</description>"
                , "<link>http://www.example.com/blog/post/1</link>"
                , "<guid isPermaLink=\"false\">7bd204c6-1655-4c27-aeee-53f933c5395f</guid>"
                , "<pubDate>Sun, 06 Sep 2009 16:20:00 +0000</pubDate>"
                , "<sometag>Some content in unknown tag, should be ignored.</sometag>"
                , "</item>"
                ]
        link = RssURI [uri|http://www.example.com/blog/post/1|]


rss2ItemCase2 :: TestTree
rss2ItemCase2 = testCase "RSS2 <item> element 2" $ do
  result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| force "ERROR" rssItem
  result^.itemTitleL @?= "Plop"
  result^.itemLinkL @?= Nothing
  result^.itemDescriptionL @?= ""
  result^.itemAuthorL @?= "author@w3schools.com"
  result^.itemGuidL @?= Nothing
  result^.itemExtensionsL @?= NoItemExtensions
  isJust (result^.itemPubDateL) @?= True
  where input = [ "<item>"
                , "<title>Plop</title>"
                , "<author>author@w3schools.com</author>"
                , "<pubDate>2018-07-13T00:00:00-04:00</pubDate>"
                , "</item>"
                ]
        link = RssURI [uri|http://www.example.com/blog/post/1|]


rss1ChannelItemsCase :: TestTree
rss1ChannelItemsCase = testCase "RSS1 <items> element" $ do
  result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| force "ERROR" rss1ChannelItems
  result @?= [resource1, resource2]
  where input = [ "<items xmlns=\"http://purl.org/rss/1.0/\" xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\">"
                , "<rdf:Seq>"
                , "<rdf:li rdf:resource=\"http://xml.com/pub/2000/08/09/xslt/xslt.html\" />"
                , "<rdf:li rdf:resource=\"http://xml.com/pub/2000/08/09/rdfdb/index.html\" />"
                , "</rdf:Seq>"
                , "</items>"
                ]
        resource1 = "http://xml.com/pub/2000/08/09/xslt/xslt.html"
        resource2 = "http://xml.com/pub/2000/08/09/rdfdb/index.html"

rss1DocumentCase :: TestTree
rss1DocumentCase = testCase "<rdf> element" $ do
  Just result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| rss1Document
  result^.documentVersionL @?= Version [1] []
  result^.channelTitleL @?= "XML.com"
  result^.channelDescriptionL @?= "XML.com features a rich mix of information and services for the XML community."
  result^.channelLinkL @?= link
  result^?channelImageL._Just.imageTitleL @?= Just "XML.com"
  result^?channelImageL._Just.imageLinkL @?= Just imageLink
  result^?channelImageL._Just.imageUriL @?= Just imageUri
  length (result^..channelItemsL) @?= 2
  result^?channelTextInputL._Just.textInputTitleL @?= Just "Search XML.com"
  result^?channelTextInputL._Just.textInputDescriptionL @?= Just "Search XML.com's XML collection"
  result^?channelTextInputL._Just.textInputNameL @?= Just "s"
  result^?channelTextInputL._Just.textInputLinkL @?= Just textInputLink
  result^.channelExtensionsL @?= NoChannelExtensions
  where input = [ "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>"
                , "<rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\" xmlns=\"http://purl.org/rss/1.0/\">"
                , "<channel rdf:about=\"http://www.xml.com/xml/news.rss\">"
                , "<title>XML.com</title>"
                , "<link>http://xml.com/pub</link>"
                , "<description>XML.com features a rich mix of information and services for the XML community.</description>"
                , "<image rdf:resource=\"http://xml.com/universal/images/xml_tiny.gif\" />"
                , "<items>"
                , "<rdf:Seq>"
                , "<rdf:li rdf:resource=\"http://xml.com/pub/2000/08/09/xslt/xslt.html\" />"
                , "<rdf:li rdf:resource=\"http://xml.com/pub/2000/08/09/rdfdb/index.html\" />"
                , "</rdf:Seq>"
                , "</items>"
                , "</channel>"
                , "<image rdf:about=\"http://xml.com/universal/images/xml_tiny.gif\">"
                , "<title>XML.com</title>"
                , "<link>http://www.xml.com</link>"
                , "<url>http://xml.com/universal/images/xml_tiny.gif</url>"
                , "</image>"
                , "<item rdf:about=\"http://xml.com/pub/2000/08/09/xslt/xslt.html\">"
                , "<title>Processing Inclusions with XSLT</title>"
                , "<link>http://xml.com/pub/2000/08/09/xslt/xslt.html</link>"
                , "<description>Processing document inclusions with general XML tools can be problematic. This article proposes a way of preserving inclusion information through SAX-based processing.</description>"
                , "</item>"
                , "<item rdf:about=\"http://xml.com/pub/2000/08/09/xslt/xslt.html\">"
                , "<title>Putting RDF to Work</title>"
                , "<link>http://xml.com/pub/2000/08/09/rdfdb/index.html</link>"
                , "<description>Tool and API support for the Resource Description Framework is slowly coming of age. Edd Dumbill takes a look at RDFDB, one of the most exciting new RDF toolkits.</description>"
                , "</item>"
                , "<textinput rdf:about=\"http://search.xml.com\">"
                , "<title>Search XML.com</title>"
                , "<description>Search XML.com's XML collection</description>"
                , "<name>s</name>"
                , "<link>http://search.xml.com</link>"
                , "</textinput>"
                , "</rdf:RDF>"
                ]
        link = RssURI [uri|http://xml.com/pub|]
        imageLink = RssURI [uri|http://www.xml.com|]
        imageUri = RssURI [uri|http://xml.com/universal/images/xml_tiny.gif|]
        textInputLink = RssURI [uri|http://search.xml.com|]


dublinCoreChannelCase :: TestTree
dublinCoreChannelCase = testCase "Dublin Core <channel> extension" $ do
  Just result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| rssDocument
  result^.channelExtensionsL @?= DublinCoreChannel dublinCoreElement NoChannelExtensions
  where input = [ "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>"
                , "<rss xmlns:dc=\"http://purl.org/dc/elements/1.1/\" version=\"2.0\">"
                , "<channel>"
                , "<title>RSS Title</title>"
                , "<link>http://xml.com/pub/2000/08/09/xslt/xslt.html</link>"
                , "<dc:publisher>The O'Reilly Network</dc:publisher>"
                , "<dc:creator>Rael Dornfest (mailto:rael@oreilly.com)</dc:creator>"
                , "<dc:date>2000-01-01T12:00:00+00:00</dc:date>"
                , "<dc:language>EN</dc:language>"
                , "<dc:rights>Copyright © 2000 O'Reilly &amp; Associates, Inc.</dc:rights>"
                , "<dc:subject>XML</dc:subject>"
                , "</channel>"
                , "</rss>"
                ]
        dublinCoreElement = mkDcMetaData
          { elementCreator = "Rael Dornfest (mailto:rael@oreilly.com)"
          , elementDate = Just date
          , elementLanguage = "EN"
          , elementPublisher = "The O'Reilly Network"
          , elementRights = "Copyright © 2000 O'Reilly & Associates, Inc."
          , elementSubject = "XML"
          }
        date = localTimeToUTC utc $ LocalTime (fromGregorian 2000 1 1) (TimeOfDay 12 0 0)

dublinCoreItemCase :: TestTree
dublinCoreItemCase = testCase "Dublin Core <item> extension" $ do
  Just result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| rssItem
  result^.itemExtensionsL @?= DublinCoreItem dublinCoreElement NoItemExtensions
  where input = [ "<item xmlns:dc=\"http://purl.org/dc/elements/1.1/\">"
                , "<title>Example entry</title>"
                , "<dc:description>XML is placing increasingly heavy loads on the existing technical "
                , "infrastructure of the Internet.</dc:description>"
                , "<dc:language>EN</dc:language>"
                , "<dc:publisher>The O'Reilly Network</dc:publisher>"
                , "<dc:creator>Simon St.Laurent (mailto:simonstl@simonstl.com)</dc:creator>"
                , "<dc:date>2000-01-01T12:00:00+00:00</dc:date>"
                , "<dc:rights>Copyright © 2000 O'Reilly &amp; Associates, Inc.</dc:rights>"
                , "<dc:subject>XML</dc:subject>"
                , "</item>"
                ]
        dublinCoreElement = mkDcMetaData
          { elementCreator = "Simon St.Laurent (mailto:simonstl@simonstl.com)"
          , elementDate = Just date
          , elementLanguage = "EN"
          , elementDescription = "XML is placing increasingly heavy loads on the existing technical infrastructure of the Internet."
          , elementPublisher = "The O'Reilly Network"
          , elementRights = "Copyright © 2000 O'Reilly & Associates, Inc."
          , elementSubject = "XML"
          }
        date = localTimeToUTC utc $ LocalTime (fromGregorian 2000 1 1) (TimeOfDay 12 0 0)

contentItemCase :: TestTree
contentItemCase = testCase "Content <item> extension" $ do
  Just result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| rssItem
  result^.itemExtensionsL @?= ContentItem "<p>What a <em>beautiful</em> day!</p>" NoItemExtensions
  where input = [ "<item xmlns:content=\"http://purl.org/rss/1.0/modules/content/\">"
                , "<title>Example entry</title>"
                , "<content:encoded><![CDATA[<p>What a <em>beautiful</em> day!</p>]]></content:encoded>"
                , "</item>"
                ]

syndicationChannelCase :: TestTree
syndicationChannelCase = testCase "Syndication <channel> extension" $ do
  Just result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| rssDocument
  result^.channelExtensionsL @?= SyndicationChannel syndicationInfo NoChannelExtensions
  where input = [ "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>"
                , "<rss xmlns:sy=\"http://purl.org/rss/1.0/modules/syndication/\" version=\"2.0\">"
                , "<channel>"
                , "<title>RSS Title</title>"
                , "<link>http://xml.com/pub/2000/08/09/xslt/xslt.html</link>"
                , "<sy:updatePeriod>hourly</sy:updatePeriod>"
                , "<sy:updateFrequency>2</sy:updateFrequency>"
                , "<sy:updateBase>2000-01-01T12:00:00+00:00</sy:updateBase>"
                , "</channel>"
                , "</rss>"
                ]
        syndicationInfo = mkSyndicationInfo
          { updatePeriod = Just Hourly
          , updateFrequency = Just 2
          , updateBase = Just date
          }
        date = localTimeToUTC utc $ LocalTime (fromGregorian 2000 1 1) (TimeOfDay 12 0 0)

atomChannelCase :: TestTree
atomChannelCase = testCase "Atom <channel> extension" $ do
  Just result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| rssDocument
  result^.channelExtensionsL @?= AtomChannel (Just link) NoChannelExtensions
  where input = [ "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>"
                , "<rss xmlns:atom=\"http://www.w3.org/2005/Atom\" version=\"2.0\">"
                , "<channel>"
                , "<title>RSS Title</title>"
                , "<link>http://xml.com/pub/2000/08/09/xslt/xslt.html</link>"
                , "<atom:link href=\"http://dallas.example.com/rss.xml\" rel=\"self\" type=\"application/rss+xml\" />"
                , "</channel>"
                , "</rss>"
                ]
        url = AtomURI [uri|http://dallas.example.com/rss.xml|]
        link = AtomLink url "self" "application/rss+xml" mempty mempty mempty

multipleExtensionsCase :: TestTree
multipleExtensionsCase = testCase "Multiple extensions" $ do
  Just result <- runResourceT . runConduit $ sourceList input .| XML.parseText' def .| rssItem
  result^.itemExtensionsL @?= ContentItem "<p>What a <em>beautiful</em> day!</p>" (AtomItem (Just link) NoItemExtensions)
  where input = [ "<item xmlns:content=\"http://purl.org/rss/1.0/modules/content/\""
                , " xmlns:atom=\"http://www.w3.org/2005/Atom\">"
                , "<title>Example entry</title>"
                , "<atom:link href=\"http://dallas.example.com/rss.xml\" rel=\"self\" type=\"application/rss+xml\" />"
                , "<content:encoded><![CDATA[<p>What a <em>beautiful</em> day!</p>]]></content:encoded>"
                , "</item>"
                ]
        url = AtomURI [uri|http://dallas.example.com/rss.xml|]
        link = AtomLink url "self" "application/rss+xml" mempty mempty mempty