add tests for EPUB2 and EPUB3 cover reader

test/Tests/Readers/EPUB.hs

@@ -44,10 +44,42 @@ featuresBag = [("img/check.gif","image/gif",1340)
               ,("img/multiscripts_and_greek_alphabet.png","image/png",10060)
               ]
 
+-- with additional meta tag for cover in EPUB2 format
+epub3CoverBag :: [(String, String, Int)]
+epub3CoverBag = [("wasteland-cover.jpg","image/jpeg",103477)]
+
+epub3NoCoverBag :: [(String, String, Int)]
+epub3NoCoverBag = [("img/check.gif","image/gif",1340)
+                  ,("img/check.jpg","image/jpeg",2661)
+                  ,("img/check.png","image/png",2815)
+                  ]
+
+-- content.opf uses the word `picture` to refer to the cover as much as validly possible
+-- to check if references are resolved correctly
+epub2PictureBag :: [(String, String, Int)]
+epub2PictureBag = [("image/image.jpg","image/jpeg",9713)]
+
+-- content.opf contains the word `cover` as much as possible, to check if possible multiple matches cause errors
+epub2CoverBag :: [(String, String, Int)]
+epub2CoverBag = [("image/cover.jpg","image/jpeg",9713)]
+
+epub2NoCoverBag :: [(String, String, Int)]
+epub2NoCoverBag = []
+
 tests :: [TestTree]
 tests =
   [ testGroup "EPUB Mediabag"
     [ testCase "features bag"
-      (testMediaBag "epub/img.epub" featuresBag)
+      (testMediaBag "epub/img.epub" featuresBag),
+      testCase "EPUB3 cover bag"
+      (testMediaBag "epub/wasteland.epub" epub3CoverBag),
+      testCase "EPUB3 no cover bag"
+      (testMediaBag "epub/img_no_cover.epub" epub3NoCoverBag),
+      testCase "EPUB2 picture bag"
+      (testMediaBag "epub/epub2_picture.epub" epub2PictureBag),
+      testCase "EPUB2 cover bag"
+      (testMediaBag "epub/epub2_cover.epub" epub2CoverBag),
+      testCase "EPUB2 no cover bag"
+      (testMediaBag "epub/epub2_no_cover.epub" epub2NoCoverBag)
     ]
   ]