diff --git a/tests/test_fotogrid.py b/tests/test_fotogrid.py
index 5a34103..6facae8 100644
--- a/tests/test_fotogrid.py
+++ b/tests/test_fotogrid.py
@@ -6,14 +6,22 @@ from lxml import etree
 from io import StringIO
 
 def check_if_valid_html(html):
+    """
+    GIVEN an html string
+    WHEN parsing the html string results in an error
+    THEN assert
+    """
     parser = etree.HTMLParser(recover=False)
     etree.parse(StringIO(html), parser)
     assert len(parser.error_log) == 0
 
 
 def test_fotogrid_empty_list():
-    urls = []
-    html = fotogrid(urls)
+    """
+    WHEN creating a fotogrid without any image url
+    THEN expecting an empty result (no html code at all)
+    """
+    html = fotogrid([])
     assert len(html) == 0
 
 
@@ -26,7 +34,11 @@ def check_if_images_result_in(nbr_of_images, rows_expected, cols_expected):
     assert html.count("<img ") == nbr_of_images
 
 
-def test_fotogrid(app, client):
+def test_fotogrid():
+    """
+    WHEN creating fotogrids whith 1 - 9 image urls
+    THEN expecting up to four generated columns
+    """
     check_if_images_result_in(1, 1, 1)
     check_if_images_result_in(2, 1, 2)
     check_if_images_result_in(3, 1, 3)