diff --git a/pythia/seo/tests/test_classifications.csv b/pythia/seo/tests/test_classifications.csv
new file mode 100644
index 0000000..e3e8fb4
--- /dev/null
+++ b/pythia/seo/tests/test_classifications.csv
@@ -0,0 +1,6 @@
+,image_id_0,image_id_1,image0_more_complex_image1
+0,1,6,1
+1,2,7,0
+2,3,8,0
+3,4,9,1
+4,5,10,1
diff --git a/pythia/seo/tests/test_elo.py b/pythia/seo/tests/test_elo.py
new file mode 100644
index 0000000..66ab332
--- /dev/null
+++ b/pythia/seo/tests/test_elo.py
@@ -0,0 +1,34 @@
+import pytest
+from pythia.seo.elo import ELO
+from pathlib import Path
+
+path = Path(__file__).parent
+
+@pytest.fixture
+def elo():
+    return ELO(classifications=path / "test_classifications.csv", delimiter=',')
+
+
+@pytest.mark.parametrize('rating_0,rating_1,expected_score',
+                         [(1400, 1400.0, 0.5),
+                          (1450, 1450.5, 0.49928044265518673),
+                          (1500, 1602.0, 0.3572869311673796),
+                          (1550, 1854.5, 0.14768898365874825),
+                          (1600, 2208.0, 0.029314241270450396)])
+def test_expected_score(elo, rating_0, rating_1, expected_score):
+    assert elo.expected_score(rating_0, rating_1) == expected_score
+
+
+@pytest.mark.parametrize('rating_for_image,k_value,score_for_image,image_expected_score,new_rating',
+                          [(1400.0, 32, 1, 0.5, 1416.0),
+                           (1450.0, 32, 0, 0.49928044265518673, 1434.023025835034),
+                           (1500.0, 32, 0, 0.3572869311673796, 1488.5668182026438),
+                           (1550.0, 32, 1, 0.14768898365874825, 1577.2739525229201),
+                           (1600.0, 32, 1, 0.029314241270450396, 1631.0619442793457),
+                           (1400.0, 32, 0, 0.5, 1384.0),
+                           (1450.5, 32, 1, 0.5007195573448133, 1466.476974164966),
+                           (1602.0, 32, 1, 0.6427130688326204, 1613.4331817973562),
+                           (1854.5, 32, 0, 0.8523110163412517, 1827.2260474770799),
+                           (2208.0, 32, 0, 0.9706857587295497, 2176.9380557206546)])
+def test_new_rating(elo, rating_for_image, k_value, score_for_image, image_expected_score, new_rating):
+    assert elo.new_rating(rating_for_image, k_value, score_for_image, image_expected_score) == new_rating
diff --git a/pythia/seo/tests/test_rankings.csv b/pythia/seo/tests/test_rankings.csv
new file mode 100644
index 0000000..bf11d4d
--- /dev/null
+++ b/pythia/seo/tests/test_rankings.csv
@@ -0,0 +1,11 @@
+,image_id,score,k_value,count,std_dev
+0,1,1400.0,32,0,32
+1,2,1450.0,32,0,32
+2,3,1500.0,32,0,32
+3,4,1550.0,32,0,32
+4,5,1600.0,32,0,32
+5,6,1400.0,32,0,32
+6,7,1450.5,32,0,32
+7,8,1602.0,32,0,32
+8,9,1854.5,32,0,32
+9,10,2208.0,32,0,32