Refactors Cover's Extension cleaning in Album

album_test.go

@@ -38,3 +38,22 @@ func (s *AlbumSuite) TestAuthors(c *C) {
 	}
 
 }
+
+func (s *AlbumSuite) TestExt(c *C) {
+	type TestData struct {
+		A   *Album
+		Res string
+	}
+	data := []TestData{
+		{&Album{CoverURL: "foo/bar/test.jpg"}, ".jpg"},
+		{&Album{CoverURL: "foo/bar/foo.JPG"}, ".jpg"},
+		{&Album{CoverURL: "foo/bar/foo.JPEG"}, ".jpeg"},
+		{&Album{CoverURL: "foo/bar/foo.023879jpg"}, ".jpg"},
+		{&Album{CoverURL: "foo/bar/foo.PNG"}, ".png"},
+		{&Album{CoverURL: "foo/bar/foo.gif"}, ".gif"},
+	}
+
+	for _, d := range data {
+		c.Check(d.A.CoverExt(), Equals, d.Res, Commentf("With URL %s", d.A.CoverURL))
+	}
+}