Use os.makedirs for test output directories

Broke Travis

tests/test_hocrtransform.py

@@ -33,7 +33,7 @@ def setup_module():
     with suppress(FileNotFoundError):
         shutil.rmtree(TEST_OUTPUT)
     with suppress(FileExistsError):
-        os.mkdir(TEST_OUTPUT)
+        os.makedirs(TEST_OUTPUT)
     with open(_make_output('blank.hocr'), 'w') as f:
         f.write(HOCR_TEMPLATE)
 

tests/test_main.py

@@ -31,7 +31,7 @@ def setup_module():
     with suppress(FileNotFoundError):
         shutil.rmtree(TEST_OUTPUT)
     with suppress(FileExistsError):
-        os.mkdir(TEST_OUTPUT)
+        os.makedirs(TEST_OUTPUT)
 
 
 def run_ocrmypdf_sh(input_file, output_file, *args, env=None):

tests/test_pageinfo.py

@@ -32,7 +32,7 @@ def setup_module():
     with suppress(FileNotFoundError):
         shutil.rmtree(TEST_OUTPUT)
     with suppress(FileExistsError):
-        os.mkdir(TEST_OUTPUT)
+        os.makedirs(TEST_OUTPUT)
 
 
 def _make_input(input_basename):