Use the same open_read function for the tests

test/test_chordpro/metadata.sgc

@@ -7,7 +7,7 @@
 {title: Subtitle4}
 {title: Subtitle5}
 {artist:  Author1}
-{artist:  Texte de Jean Richepin, chanté par Georges Brassens}
+{artist: Texte de Jean Richepin, chanté par Georges Brassens}
 {album: Album}
 {copyright: Copyright}
 {cov: metadata_cover}

test/test_chordpro/metadata.tex

@@ -8,7 +8,7 @@ Subtitle4\\
 Subtitle5}[
   by={
          Author1,
-         Texte de Jean Richepin, chanté par Georges Brassens  },
+        Texte de Jean Richepin, chanté par Georges Brassens  },
   album={Album},
   copyright={Copyright},
     cov={img/test/test_chordpro/metadata_cover},

test/test_chordpro/test_parser.py

@@ -9,6 +9,7 @@ from pkg_resources import resource_filename
 
 from patacrep import files
 from patacrep.build import DEFAULT_CONFIG
+from patacrep.encoding import open_read
 
 from .. import disable_logging
 
@@ -63,7 +64,7 @@ class FileTestMeta(type):
             if base is None or dest is None:
                 return
             destname = "{}.{}".format(base, dest)
-            with open(destname, 'r', encoding='utf8') as expectfile:
+            with open_read(destname) as expectfile:
                 chordproname = "{}.source".format(base)
                 with disable_logging():
                     self.assertMultiLineEqual(