diff --git a/.travis.yml b/.travis.yml
index 3aceab0a..c398bbfe 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,14 +8,16 @@ install:
 script:
   - tox
 sudo: false
-addons:
-  apt:
-    packages:
-    - texlive-latex-base
-    - latex-xcolor
-    - texlive-latex-extra
-    - pgf
-    - lmodern
-    - lilypond
+# addons:
+#   apt:
+#     packages:
+#     - texlive-latex-base
+#     - latex-xcolor
+#     - texlive-latex-extra
+#     - texlive-luatex
+#     - texlive-xetex
+#     - pgf
+#     - lmodern
+#     - lilypond
 notifications:
   email: false
diff --git a/patacrep/build.py b/patacrep/build.py
index 40ef74ff..00be667e 100644
--- a/patacrep/build.py
+++ b/patacrep/build.py
@@ -136,10 +136,10 @@ class SongbookBuilder(object):
 
     # if False, do not expect anything from stdin.
     interactive = False
-    # if True, allow unsafe option, like adding the --shell-escape to pdflatex
+    # if True, allow unsafe option, like adding the --shell-escape to lualatex
     unsafe = False
-    # Options to add to pdflatex
-    _pdflatex_options = []
+    # Options to add to lualatex
+    _lualatex_options = []
     # Dictionary of functions that have been called by self._run_once(). Keys
     # are function; values are return values of functions.
     _called_functions = {}
@@ -165,11 +165,11 @@ class SongbookBuilder(object):
     def _set_latex(self):
         """Set LaTeX options."""
         if self.unsafe:
-            self._pdflatex_options.append("--shell-escape")
+            self._lualatex_options.append("--shell-escape")
         if not self.interactive:
-            self._pdflatex_options.append("-halt-on-error")
+            self._lualatex_options.append("-halt-on-error")
         for datadir in self.songbook.config["datadir"]:
-            self._pdflatex_options.append(
+            self._lualatex_options.append(
                 '--include-directory="{}"'.format(datadir)
                 )
 
@@ -180,7 +180,7 @@ class SongbookBuilder(object):
         - steps: list of steps to perform to compile songbook. Available steps
           are:
           - tex: build .tex file from templates;
-          - pdf: compile .tex using pdflatex;
+          - pdf: compile .tex using lualatex;
           - sbx: compile song and author indexes;
           - clean: remove temporary files,
           - any string beginning with a sharp sign (#): it is interpreted as a
@@ -219,7 +219,7 @@ class SongbookBuilder(object):
 
         try:
             process = Popen(
-                ["pdflatex"] + self._pdflatex_options + [self.basename],
+                ["lualatex"] + self._lualatex_options + [self.basename],
                 stdin=PIPE,
                 stdout=PIPE,
                 stderr=PIPE,
diff --git a/patacrep/data/latex/patacrep.sty b/patacrep/data/latex/patacrep.sty
index f3218005..d3735739 100644
--- a/patacrep/data/latex/patacrep.sty
+++ b/patacrep/data/latex/patacrep.sty
@@ -75,6 +75,11 @@
 \pdfobjcompresslevel=0
 
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% Unicode characters
+\RequirePackage{fontspec}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Multilanguage management
 
diff --git a/patacrep/data/templates/layout.tex b/patacrep/data/templates/layout.tex
index ae23d681..099772a4 100644
--- a/patacrep/data/templates/layout.tex
+++ b/patacrep/data/templates/layout.tex
@@ -41,8 +41,6 @@
 (* endblock *)
 
 (* block songbookpreambule *)
-\usepackage[utf8]{inputenc}
-\usepackage[T1]{fontenc}
 \usepackage{lmodern}
 (* endblock songbookpreambule *)
 
diff --git a/test/dynamic.py b/test/dynamic.py
index 19b721a3..494dfc8f 100644
--- a/test/dynamic.py
+++ b/test/dynamic.py
@@ -13,13 +13,9 @@ class DynamicTest(type):
 
     def __init__(cls, name, bases, nmspc):
         super().__init__(name, bases, nmspc)
-        for methodname, args in cls._iter_testmethods():
-            setattr(cls, methodname, cls._create_test(*args))
+        for methodname, testmethod in cls._iter_testmethods():
+            setattr(cls, methodname, testmethod)
 
     def _iter_testmethods(cls):
-        """Iterate over test methods."""
-        raise NotImplementedError()
-
-    def _create_test(cls, *args, **kwargs):
-        """Create and return a test method."""
+        """Iterate over dynamically generated test methods."""
         raise NotImplementedError()
diff --git a/test/test_chordpro/test_parser.py b/test/test_chordpro/test_parser.py
index 727cabba..f0e94290 100644
--- a/test/test_chordpro/test_parser.py
+++ b/test/test_chordpro/test_parser.py
@@ -58,7 +58,7 @@ class FileTest(unittest.TestCase, metaclass=dynamic.DynamicTest):
                     continue
                 yield (
                     "test_{}_{}".format(os.path.basename(base), dest),
-                    [base, dest],
+                    cls._create_test(base, dest),
                     )
 
     @classmethod
diff --git a/test/test_compilation/subdir.sb b/test/test_compilation/datadir.sb
similarity index 51%
rename from test/test_compilation/subdir.sb
rename to test/test_compilation/datadir.sb
index 28132138..357c28d7 100644
--- a/test/test_compilation/subdir.sb
+++ b/test/test_compilation/datadir.sb
@@ -2,6 +2,6 @@
 "bookoptions" : [
     "pictures"
   ],
-"datadir": ["subdir_datadir", "subdir_datadir2"],
+"datadir": ["datadir_datadir", "datadir_datadir2"],
 "lang": "en"
 }
diff --git a/test/test_compilation/subdir.tex.control b/test/test_compilation/datadir.tex.control
similarity index 68%
rename from test/test_compilation/subdir.tex.control
rename to test/test_compilation/datadir.tex.control
index 7c816f7e..4f6c8521 100644
--- a/test/test_compilation/subdir.tex.control
+++ b/test/test_compilation/datadir.tex.control
@@ -13,8 +13,8 @@
 
 \makeatletter
 \def\input@path{ %
-        {@TEST_FOLDER@/subdir_datadir/latex/} %
-        {@TEST_FOLDER@/subdir_datadir2/latex/} %
+        {@TEST_FOLDER@/datadir_datadir/latex/} %
+        {@TEST_FOLDER@/datadir_datadir2/latex/} %
         {@TEST_FOLDER@/latex/} %
         {@DATA_FOLDER@/latex/} %
 }
@@ -29,8 +29,6 @@ pictures,
 guitar,
     ]{patacrep}
 
-\usepackage[utf8]{inputenc}
-\usepackage[T1]{fontenc}
 \usepackage{lmodern}
 
 
@@ -41,8 +39,8 @@ guitar,
 
 \usepackage{graphicx}
 \graphicspath{ %
-        {@TEST_FOLDER@/subdir_datadir/} %
-        {@TEST_FOLDER@/subdir_datadir2/} %
+        {@TEST_FOLDER@/datadir_datadir/} %
+        {@TEST_FOLDER@/datadir_datadir2/} %
         {@TEST_FOLDER@/} %
         {@DATA_FOLDER@/} %
 }
@@ -63,8 +61,8 @@ guitar,
 \title{Guitar songbook}
 \author{The Patacrep Team}
 
-\newindex{titleidx}{subdir_title}
-\newauthorindex{authidx}{subdir_auth}
+\newindex{titleidx}{datadir_title}
+\newauthorindex{authidx}{datadir_auth}
 
 
 \notenamesout{A}{B}{C}{D}{E}{F}{G}
@@ -94,7 +92,7 @@ guitar,
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %% songs/./datadir.sg
 
-\import{subdir_datadir/songs/}{datadir.sg}
+\import{datadir_datadir/songs/}{datadir.sg}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %% songs/./datadir.sgc
@@ -121,7 +119,7 @@ Chordpro}[
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %% songs/./datadir2.sg
 
-\import{subdir_datadir/songs/}{datadir2.sg}
+\import{datadir_datadir/songs/}{datadir2.sg}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %% songs/./datadir2.sgc
@@ -148,7 +146,7 @@ Chordpro}[
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %% songs/./relative.sg
 
-\import{subdir_datadir/songs/}{relative.sg}
+\import{datadir_datadir/songs/}{relative.sg}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %% songs/./relative.sgc
@@ -159,15 +157,42 @@ Chordpro}[
 Chordpro}[
   by={
   },
-    cov={@TEST_FOLDER@/subdir_datadir/songs/./relative.png},
+    cov={@TEST_FOLDER@/datadir_datadir/songs/./relative.png},
 ]
 
 \cover
 
 
 
-\lilypond{@TEST_FOLDER@/subdir_datadir/songs/./relative.ly}
-\image{@TEST_FOLDER@/subdir_datadir/songs/./relative.png}
+\lilypond{@TEST_FOLDER@/datadir_datadir/songs/./relative.ly}
+\image{@TEST_FOLDER@/datadir_datadir/songs/./relative.png}
+
+
+\endsong
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% songs/./subdir/subdir.sg
+
+\import{datadir_datadir/songs/subdir/}{subdir.sg}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% songs/./subdir/subdir.sgc
+
+\selectlanguage{english}
+
+\beginsong{Image included from a nested song directory\\
+Chordpro}[
+  by={
+  },
+    cov={@TEST_FOLDER@/datadir_datadir/songs/./subdir/subdir.png},
+]
+
+\cover
+
+
+
+\lilypond{@TEST_FOLDER@/datadir_datadir/songs/./subdir/subdir.ly}
+\image{@TEST_FOLDER@/datadir_datadir/songs/./subdir/subdir.png}
 
 
 \endsong
diff --git a/test/test_compilation/subdir_datadir/img/datadir.png b/test/test_compilation/datadir_datadir/img/datadir.png
similarity index 100%
rename from test/test_compilation/subdir_datadir/img/datadir.png
rename to test/test_compilation/datadir_datadir/img/datadir.png
diff --git a/test/test_compilation/subdir_datadir/scores/datadir.ly b/test/test_compilation/datadir_datadir/scores/datadir.ly
similarity index 100%
rename from test/test_compilation/subdir_datadir/scores/datadir.ly
rename to test/test_compilation/datadir_datadir/scores/datadir.ly
diff --git a/test/test_compilation/subdir_datadir/songs/datadir.sg b/test/test_compilation/datadir_datadir/songs/datadir.sg
similarity index 100%
rename from test/test_compilation/subdir_datadir/songs/datadir.sg
rename to test/test_compilation/datadir_datadir/songs/datadir.sg
diff --git a/test/test_compilation/subdir_datadir/songs/datadir.sgc b/test/test_compilation/datadir_datadir/songs/datadir.sgc
similarity index 100%
rename from test/test_compilation/subdir_datadir/songs/datadir.sgc
rename to test/test_compilation/datadir_datadir/songs/datadir.sgc
diff --git a/test/test_compilation/subdir_datadir/songs/datadir2.sg b/test/test_compilation/datadir_datadir/songs/datadir2.sg
similarity index 100%
rename from test/test_compilation/subdir_datadir/songs/datadir2.sg
rename to test/test_compilation/datadir_datadir/songs/datadir2.sg
diff --git a/test/test_compilation/subdir_datadir/songs/datadir2.sgc b/test/test_compilation/datadir_datadir/songs/datadir2.sgc
similarity index 100%
rename from test/test_compilation/subdir_datadir/songs/datadir2.sgc
rename to test/test_compilation/datadir_datadir/songs/datadir2.sgc
diff --git a/test/test_compilation/subdir_datadir/songs/relative.ly b/test/test_compilation/datadir_datadir/songs/relative.ly
similarity index 100%
rename from test/test_compilation/subdir_datadir/songs/relative.ly
rename to test/test_compilation/datadir_datadir/songs/relative.ly
diff --git a/test/test_compilation/subdir_datadir/songs/relative.png b/test/test_compilation/datadir_datadir/songs/relative.png
similarity index 100%
rename from test/test_compilation/subdir_datadir/songs/relative.png
rename to test/test_compilation/datadir_datadir/songs/relative.png
diff --git a/test/test_compilation/subdir_datadir/songs/relative.sg b/test/test_compilation/datadir_datadir/songs/relative.sg
similarity index 100%
rename from test/test_compilation/subdir_datadir/songs/relative.sg
rename to test/test_compilation/datadir_datadir/songs/relative.sg
diff --git a/test/test_compilation/subdir_datadir/songs/relative.sgc b/test/test_compilation/datadir_datadir/songs/relative.sgc
similarity index 100%
rename from test/test_compilation/subdir_datadir/songs/relative.sgc
rename to test/test_compilation/datadir_datadir/songs/relative.sgc
diff --git a/test/test_compilation/subdir_datadir2/scores/datadir2.ly b/test/test_compilation/datadir_datadir/songs/subdir/subdir.ly
similarity index 100%
rename from test/test_compilation/subdir_datadir2/scores/datadir2.ly
rename to test/test_compilation/datadir_datadir/songs/subdir/subdir.ly
diff --git a/test/test_compilation/datadir_datadir/songs/subdir/subdir.png b/test/test_compilation/datadir_datadir/songs/subdir/subdir.png
new file mode 100644
index 00000000..2e134e8f
Binary files /dev/null and b/test/test_compilation/datadir_datadir/songs/subdir/subdir.png differ
diff --git a/test/test_compilation/datadir_datadir/songs/subdir/subdir.sg b/test/test_compilation/datadir_datadir/songs/subdir/subdir.sg
new file mode 100644
index 00000000..f86b47b4
--- /dev/null
+++ b/test/test_compilation/datadir_datadir/songs/subdir/subdir.sg
@@ -0,0 +1,10 @@
+\beginsong{Image included from a nested song directory\\\LaTeX}
+  [cov={subdir}]
+
+  \cover
+
+  \lilypond{subdir.ly}
+
+  \image{subdir}
+
+\endsong
diff --git a/test/test_compilation/datadir_datadir/songs/subdir/subdir.sgc b/test/test_compilation/datadir_datadir/songs/subdir/subdir.sgc
new file mode 100644
index 00000000..0f2cb436
--- /dev/null
+++ b/test/test_compilation/datadir_datadir/songs/subdir/subdir.sgc
@@ -0,0 +1,7 @@
+{title : Image included from a nested song directory}
+{subtitle: Chordpro}
+{cover: subdir.png}
+{lang: en}
+
+{partition: subdir.ly}
+{image: subdir.png}
diff --git a/test/test_compilation/subdir_datadir2/img/datadir2.png b/test/test_compilation/datadir_datadir2/img/datadir2.png
similarity index 100%
rename from test/test_compilation/subdir_datadir2/img/datadir2.png
rename to test/test_compilation/datadir_datadir2/img/datadir2.png
diff --git a/test/test_compilation/datadir_datadir2/scores/datadir2.ly b/test/test_compilation/datadir_datadir2/scores/datadir2.ly
new file mode 100644
index 00000000..1fd2bccb
--- /dev/null
+++ b/test/test_compilation/datadir_datadir2/scores/datadir2.ly
@@ -0,0 +1,19 @@
+\include "_lilypond/header"
+\paper{paper-height = 6.5\cm}
+
+{
+  \key a \minor
+    \time 6/8
+    \partial 8 a'8
+    \relative c''{
+      c4 d8 e8. (f16) e8 d4 b8 g8. (a16) b8
+      c4 a8 a8. (gis16) a8 b4 gis8 e4 a8
+      c4 d8 e8. (f16 e8) d4 b8 g8. (a16) b8
+      c8. (b16) a8 gis8. (fis16) gis8 a4 a8 a4.
+
+      g'4. g8. (fis16) e8 d4 b8 g8. (a16) b8
+      c4 (a8) a8. (gis16) a8 b4 gis8 e4.
+      g'4. g8. (fis16) e8 d4 b8 g8. (a16) b8
+      c8. (b16) a8 gis8. (fis16) gis8 a4. a4.
+    }
+}
diff --git a/test/test_compilation/test_compilation.py b/test/test_compilation/test_compilation.py
index 812ba0ac..dc07107a 100644
--- a/test/test_compilation/test_compilation.py
+++ b/test/test_compilation/test_compilation.py
@@ -3,10 +3,10 @@
 # pylint: disable=too-few-public-methods
 
 import glob
+import logging
 import os
 import subprocess
 import unittest
-import logging
 
 from patacrep.encoding import open_read
 
@@ -30,7 +30,7 @@ class FileTest(unittest.TestCase, metaclass=dynamic.DynamicTest):
 
     @classmethod
     def _iter_testmethods(cls):
-        """Iterate over songbook files to test."""
+        """Iterate over dynamically generated test methods."""
         for songbook in sorted(glob.glob(os.path.join(
                 os.path.dirname(__file__),
                 '*.sb',
@@ -40,19 +40,20 @@ class FileTest(unittest.TestCase, metaclass=dynamic.DynamicTest):
             if not os.path.exists(control):
                 continue
             yield (
-                "test_{}".format(os.path.basename(base)),
-                [base],
+                "test_generation_{}".format(os.path.basename(base)),
+                cls._create_generation_test(base),
+                )
+            yield (
+                "test_compilation_{}".format(os.path.basename(base)),
+                cls._create_compilation_test(base),
                 )
 
     @classmethod
-    def _create_test(cls, base):
-        """Return a function testing that `base` compiles."""
-
-        def test_compile(self):
-            """Test that `base` is correctly compiled."""
-            if base is None:
-                return
+    def _create_generation_test(cls, base):
+        """Return a function testing that `base.tex` is correctly generated."""
 
+        def test_generation(self):
+            """Test that `base.tex` is correctly generated."""
             songbook = "{}.sb".format(base)
 
             # Check tex generation
@@ -83,13 +84,26 @@ class FileTest(unittest.TestCase, metaclass=dynamic.DynamicTest):
                         expected,
                         )
 
+        test_generation.__doc__ = (
+            "Test that '{base}' is correctly generated."
+            ).format(base=os.path.basename(base))
+        return test_generation
+
+    @classmethod
+    def _create_compilation_test(cls, base):
+        """Return a function testing that `base.tex` is correctly compiled."""
+        @unittest.skipIf('TRAVIS' in os.environ,
+                         "Travis does not support lualatex compilation yet")
+        def test_compilation(self):
+            """Test that `base` is rendered to pdf."""
             # Check compilation
+            songbook = "{}.sb".format(base)
             self.assertEqual(0, self.compile_songbook(songbook))
 
-        test_compile.__doc__ = (
+        test_compilation.__doc__ = (
             "Test that '{base}' is correctly compiled."
             ).format(base=os.path.basename(base))
-        return test_compile
+        return test_compilation
 
     @staticmethod
     def compile_songbook(songbook, steps=None):
diff --git a/test/test_compilation/unicode.sb b/test/test_compilation/unicode.sb
new file mode 100644
index 00000000..fffed7cc
--- /dev/null
+++ b/test/test_compilation/unicode.sb
@@ -0,0 +1,4 @@
+{
+"datadir": ["unicode_datadir"],
+"lang": "en"
+}
diff --git a/test/test_compilation/unicode.tex.control b/test/test_compilation/unicode.tex.control
new file mode 100644
index 00000000..9c8e946d
--- /dev/null
+++ b/test/test_compilation/unicode.tex.control
@@ -0,0 +1,114 @@
+
+
+
+
+
+
+%% Automatically generated document.
+%% You may edit this file but all changes will be overwritten.
+%% If you want to change this document, have a look at
+%% the templating system.
+%%
+%% Generated using Songbook <http://www.patacrep.com>
+
+\makeatletter
+\def\input@path{ %
+        {@TEST_FOLDER@/unicode_datadir/latex/} %
+        {@TEST_FOLDER@/latex/} %
+        {@DATA_FOLDER@/latex/} %
+}
+\makeatother
+
+\documentclass[
+    ]{article}
+
+\usepackage[
+    chorded,
+diagram,
+pictures,
+guitar,
+    ]{patacrep}
+
+\usepackage{lmodern}
+
+
+\PassOptionsToPackage{english}{babel}
+\usepackage[english]{babel}
+\lang{english}
+
+\usepackage{graphicx}
+\graphicspath{ %
+        {@TEST_FOLDER@/unicode_datadir/} %
+        {@TEST_FOLDER@/} %
+        {@DATA_FOLDER@/} %
+}
+
+
+\makeatletter
+\@ifpackageloaded{hyperref}{}{
+   \usepackage{url}
+   \newcommand{\phantomsection}{}
+   \newcommand{\hyperlink}[2]{#2}
+   \newcommand{\href}[2]{\expandafter\url\expandafter{#1}}
+}
+\makeatother
+
+
+\usepackage{chords}
+
+\title{Guitar songbook}
+\author{The Patacrep Team}
+
+\newindex{titleidx}{unicode_title}
+\newauthorindex{authidx}{unicode_auth}
+
+
+\notenamesout{A}{B}{C}{D}{E}{F}{G}
+
+
+\begin{document}
+
+\maketitle
+
+
+\showindex{\songindexname}{titleidx}
+\showindex{\authorindexname}{authidx}
+
+% list of chords
+\ifchorded
+  \ifdiagram
+     \phantomsection
+     \addcontentsline{toc}{section}{\chordlistname}
+     \chords
+  \fi
+\fi
+
+\phantomsection
+\addcontentsline{toc}{section}{\songlistname}
+
+\begin{songs}{titleidx,authidx}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% songs/./nonbreak.sgc
+
+\selectlanguage{english}
+
+\beginsong{Song with non breakable space}[
+  by={
+        Author with non breaking space chars  },
+]
+
+
+
+
+\begin{verse}
+    Non break
+\end{verse}
+
+\endsong
+
+\end{songs}
+
+
+
+
+\end{document}
diff --git a/test/test_compilation/unicode_datadir/songs/nonbreak.sgc b/test/test_compilation/unicode_datadir/songs/nonbreak.sgc
new file mode 100644
index 00000000..841d9acb
--- /dev/null
+++ b/test/test_compilation/unicode_datadir/songs/nonbreak.sgc
@@ -0,0 +1,5 @@
+{title : Song with non breakable space}
+{by: Author with non breaking space chars}
+{lang: en}
+
+Non break
diff --git a/tox.ini b/tox.ini
index aa6c7c00..1b6a3337 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,6 +7,7 @@ envlist = py34, lint
 
 [testenv]
 commands = {envpython} setup.py test
+passenv = TRAVIS
 deps =
 
 [testenv:lint]