diff --git a/src/dinglehopper/tests/test_character_error_rate.py b/src/dinglehopper/tests/test_character_error_rate.py
index 970f740..63d2f72 100644
--- a/src/dinglehopper/tests/test_character_error_rate.py
+++ b/src/dinglehopper/tests/test_character_error_rate.py
@@ -14,9 +14,9 @@ def test_character_error_rate():
     assert character_error_rate("Foo", "") == 3 / 3
 
     assert character_error_rate("", "") == 0
-    assert math.isinf(character_error_rate("", "Foo"))
+    assert character_error_rate("", "Foo") == 3 / 3
 
-    assert character_error_rate("Foo", "Food") == 1 / 3
+    assert character_error_rate("Foo", "Food") == 1 / 4
     assert character_error_rate("Fnord", "Food") == 2 / 5
     assert character_error_rate("Müll", "Mull") == 1 / 4
     assert character_error_rate("Abstand", "Sand") == 4 / 7
diff --git a/src/dinglehopper/tests/test_edit_distance.py b/src/dinglehopper/tests/test_edit_distance.py
index be427a8..e782ca6 100644
--- a/src/dinglehopper/tests/test_edit_distance.py
+++ b/src/dinglehopper/tests/test_edit_distance.py
@@ -6,8 +6,8 @@ from .. import distance
 
 
 def test_distance():
-    assert distance("Fnord", "Food") == 2
-    assert distance("Müll", "Mull") == 1
+    assert distance("Fnord", "Food") == 2 / 5
+    assert distance("Müll", "Mull") == 1 / 4
 
     word1 = unicodedata.normalize("NFC", "Schlyñ")
     word2 = unicodedata.normalize("NFD", "Schlyñ")  # Different, decomposed!
@@ -21,4 +21,4 @@ def test_distance():
     assert (
         len(word2) == 7
     )  # This, OTOH, ends with LATIN SMALL LETTER M + COMBINING TILDE, 7 code points
-    assert distance(word1, word2) == 1
+    assert distance(word1, word2) == 1 / 6
diff --git a/src/dinglehopper/tests/test_integ_character_error_rate_ocr.py b/src/dinglehopper/tests/test_integ_character_error_rate_ocr.py
index 7755e2d..b3a5914 100644
--- a/src/dinglehopper/tests/test_integ_character_error_rate_ocr.py
+++ b/src/dinglehopper/tests/test_integ_character_error_rate_ocr.py
@@ -56,4 +56,4 @@ def test_character_error_rate_between_page_alto_2():
         )
     )
 
-    assert character_error_rate(gt, ocr) == 8 / 591  # Manually verified
+    assert character_error_rate(gt, ocr) == 8 / 594  # Manually verified
diff --git a/src/dinglehopper/tests/test_integ_cli_valid_json.py b/src/dinglehopper/tests/test_integ_cli_valid_json.py
index 6cbfa0c..a993ee7 100644
--- a/src/dinglehopper/tests/test_integ_cli_valid_json.py
+++ b/src/dinglehopper/tests/test_integ_cli_valid_json.py
@@ -32,11 +32,11 @@ def test_cli_json_cer_is_infinity(tmp_path):
 
     with working_directory(tmp_path):
         with open("gt.txt", "w") as gtf:
-            gtf.write("")  # Empty to yield CER == inf
+            gtf.write("")
         with open("ocr.txt", "w") as ocrf:
             ocrf.write("Not important")
 
         process("gt.txt", "ocr.txt", "report")
         with open("report.json", "r") as jsonf:
             j = json.load(jsonf)
-            assert j["cer"] == pytest.approx(float("inf"))
+            assert j["cer"] == pytest.approx(1.0)
diff --git a/src/dinglehopper/tests/test_integ_edit_distance_ocr.py b/src/dinglehopper/tests/test_integ_edit_distance_ocr.py
index e01ac76..b032e22 100644
--- a/src/dinglehopper/tests/test_integ_edit_distance_ocr.py
+++ b/src/dinglehopper/tests/test_integ_edit_distance_ocr.py
@@ -17,7 +17,7 @@ def test_distance_between_page_files():
     # → 2 differences
     gt = page_text(ET.parse(os.path.join(data_dir, "test-gt.page2018.xml")))
     ocr = page_text(ET.parse(os.path.join(data_dir, "test-fake-ocr.page2018.xml")))
-    assert distance(gt, ocr) == 2
+    assert distance(gt, ocr) == 2 / 827
 
 
 @pytest.mark.integration
@@ -52,4 +52,4 @@ def test_distance_between_page_alto_2():
         )
     )
 
-    assert distance(gt, ocr) == 8  # Manually verified
+    assert distance(gt, ocr) == 8 / 594  # Manually verified
diff --git a/src/dinglehopper/tests/test_integ_empty_files.py b/src/dinglehopper/tests/test_integ_empty_files.py
index 5c90ed1..2b29513 100644
--- a/src/dinglehopper/tests/test_integ_empty_files.py
+++ b/src/dinglehopper/tests/test_integ_empty_files.py
@@ -12,9 +12,9 @@ from .util import working_directory
 @pytest.mark.parametrize(
     "gt_file_content,ocr_file_content,cer_expected",
     [
-        ("", "Lorem ipsum", math.inf),
+        ("", "Lorem ipsum", 1.0),
         ("Lorem ipsum", "", 1.0),
-        ("\ufeff", "Lorem ipsum", math.inf),
+        ("\ufeff", "Lorem ipsum", 1.0),
         ("Lorem ipsum", "\ufeff", 1.0),
         ("", "", 0.0),
         ("\ufeff", "", 0.0),
diff --git a/src/dinglehopper/tests/test_integ_word_error_rate_ocr.py b/src/dinglehopper/tests/test_integ_word_error_rate_ocr.py
index 8a57ed2..f114685 100644
--- a/src/dinglehopper/tests/test_integ_word_error_rate_ocr.py
+++ b/src/dinglehopper/tests/test_integ_word_error_rate_ocr.py
@@ -64,5 +64,5 @@ def test_word_error_rate_between_page_alto_2():
     )
 
     assert (
-        word_error_rate(gt, ocr) == 7 / gt_word_count
+        word_error_rate(gt, ocr) == 7 / (gt_word_count + 1)
     )  # Manually verified, 6 words are wrong, 1 got split (=2 errors)
diff --git a/src/dinglehopper/tests/test_word_error_rate.py b/src/dinglehopper/tests/test_word_error_rate.py
index 311ffff..245fa74 100644
--- a/src/dinglehopper/tests/test_word_error_rate.py
+++ b/src/dinglehopper/tests/test_word_error_rate.py
@@ -76,7 +76,7 @@ def test_word_error_rate():
     )
 
     assert word_error_rate("Dies ist ein Beispielsatz!", "") == 4 / 4
-    assert math.isinf(word_error_rate("", "Dies ist ein Beispielsatz!"))
+    assert word_error_rate("", "Dies ist ein Beispielsatz!") == 4 / 4
     assert word_error_rate("", "") == 0
 
     assert (