diff --git a/expats/feature/text_basics.py b/expats/feature/text_basics.py
index 5f82a31..f6967c9 100644
--- a/expats/feature/text_basics.py
+++ b/expats/feature/text_basics.py
@@ -14,6 +14,12 @@ def extract(self, _input):
         return np.array([len(_input)])
 
 
+@Feature.register
+class NumberOfTokenPerSentFeature(Feature[spacy.tokens.doc.Doc]):
+    def extract(self, _input):
+        return np.array([len(_input) / len(list(_input.sents))])
+
+
 @Feature.register
 class AverageTokenLengthFeature(Feature[spacy.tokens.doc.Doc]):
     def extract(self, _input):
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..c60680b
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,8 @@
+
+import spacy
+import pytest
+
+
+@pytest.fixture(scope="session")
+def spacy_en():
+    yield spacy.load("en_core_web_sm")
diff --git a/tests/feature/test_text_basics.py b/tests/feature/test_text_basics.py
index 4d7d9da..0ed6c1c 100644
--- a/tests/feature/test_text_basics.py
+++ b/tests/feature/test_text_basics.py
@@ -1,53 +1,60 @@
-from typing import List
 
 import numpy as np
-import spacy
 import pytest
 
 from expats.feature.text_basics import (
     NumberOfTokenFeature,
+    NumberOfTokenPerSentFeature,
     AverageTokenLengthFeature,
     UnigramLikelihoodFeature,
 )
 
 
-def _create_spacy_doc(words: List[str]) -> spacy.tokens.doc.Doc:
-    return spacy.tokens.doc.Doc(spacy.vocab.Vocab(), words=words)
+@pytest.mark.parametrize(
+    "text, expected_value",
+    [
+        ("i am here", 3),
+    ]
+)
+def test_number_of_token_feature(spacy_en, text, expected_value):
+    doc = spacy_en(text)
+    feature = NumberOfTokenFeature()
+    np.testing.assert_array_equal(feature.extract(doc), np.array([expected_value]))
 
 
 @pytest.mark.parametrize(
-    "words, expected_value",
+    "text, expected_value",
     [
-        (["i", "am", "here"], 3),
+        ("This is foo. That is foo bar.", (9 / 2)),
     ]
 )
-def test_number_of_token_feature(words, expected_value):
-    doc = _create_spacy_doc(words)
-    feature = NumberOfTokenFeature()
+def test_number_of_token_per_sent_feature(spacy_en, text, expected_value):
+    doc = spacy_en(text)
+    feature = NumberOfTokenPerSentFeature()
     np.testing.assert_array_equal(feature.extract(doc), np.array([expected_value]))
 
 
 @pytest.mark.parametrize(
-    "words, expected_value",
+    "text, expected_value",
     [
-        (["i", "am", "here"], 7 / 3),
-        (["a", "ab", "b"], 4 / 3)
+        ("i am here", 7 / 3),
+        ("a ab b", 4 / 3)
     ]
 )
-def test_average_token_length_feature(words, expected_value):
-    doc = _create_spacy_doc(words)
+def test_average_token_length_feature(spacy_en, text, expected_value):
+    doc = spacy_en(text)
     feature = AverageTokenLengthFeature()
     np.testing.assert_array_equal(feature.extract(doc), np.array([expected_value]))
 
 
 @pytest.mark.parametrize(
-    "words, word2freq, expected_value",
+    "text, word2freq, expected_value",
     [
-        (["i", "am"], {"i": 4, "am": 3, "is": 2}, (np.log(4 / 9) + np.log(3 / 9)) / 2),
-        (["i", "are"], {"i": 4, "am": 3, "is": 2}, (np.log(4 / 9) + np.log(1 / 9)) / 2),  # NOTE: OOV case
+        ("i am", {"i": 4, "am": 3, "is": 2}, (np.log(4 / 9) + np.log(3 / 9)) / 2),
+        ("i are", {"i": 4, "am": 3, "is": 2}, (np.log(4 / 9) + np.log(1 / 9)) / 2),  # NOTE: OOV case
     ]
 )
-def test_unigram_likelihood_feature(words, word2freq, expected_value):
-    doc = _create_spacy_doc(words)
+def test_unigram_likelihood_feature(spacy_en, text, word2freq, expected_value):
+    doc = spacy_en(text)
     feature = UnigramLikelihoodFeature(word2freq)
     np.testing.assert_array_equal(feature.extract(doc), np.array([expected_value]))