diff --git a/tests/test_html2docx.py b/tests/test_html2docx.py
new file mode 100644
index 0000000..dee721c
--- /dev/null
+++ b/tests/test_html2docx.py
@@ -0,0 +1,46 @@
+import json
+import pathlib
+
+import docx
+import pytest
+
+from html2docx import html2docx
+
+
+def generate_testdata():
+    datadir = pathlib.Path(__file__).parent.joinpath("data")
+    for html_path in datadir.glob("*.html"):
+        spec_path = datadir.joinpath(f"{html_path.stem}.json")
+        yield html_path, spec_path
+
+
+@pytest.mark.parametrize("html_path,spec_path", generate_testdata())
+def test_html2docx(html_path, spec_path):
+    title = html_path.name
+    with html_path.open() as fp:
+        html = fp.read()
+    with spec_path.open() as fp:
+        spec = json.load(fp)
+
+    buf = html2docx(html, title=title)
+    doc = docx.Document(buf)
+
+    assert doc.core_properties.title == title
+    assert len(doc.paragraphs) == len(spec)
+    for p, p_spec in zip(doc.paragraphs, spec):
+        assert p.text == p_spec["text"]
+        assert p.style.name == p_spec.get("style", "Normal")
+
+        runs_spec = p_spec["runs"]
+        assert len(p.runs) == len(runs_spec)
+        for run, run_spec in zip(p.runs, runs_spec):
+            assert run.text == run_spec["text"]
+            assert run.bold is run_spec.get(
+                "bold", False
+            ), f"Wrong bold for text '{run.text}'."
+            assert run.italic is run_spec.get(
+                "italic", False
+            ), f"Wrong italic for text '{run.text}'."
+            assert run.underline is run_spec.get(
+                "underline", False
+            ), f"Wrong underline for text '{run.text}'."
diff --git a/tests/tests.py b/tests/tests.py
deleted file mode 100644
index 69474eb..0000000
--- a/tests/tests.py
+++ /dev/null
@@ -1,48 +0,0 @@
-import json
-import pathlib
-from unittest import TestCase
-
-import docx
-
-from html2docx import html2docx
-
-
-class Html2DocxTest(TestCase):
-    def test_html2docx(self):
-        datadir = pathlib.Path(__file__).parent.joinpath("html2docx")
-        for path in datadir.glob("*.html"):
-            with self.subTest(path.name):
-                with datadir.joinpath(f"{path.stem}.json").open() as fp:
-                    spec = json.load(fp)
-
-                with path.open() as fp:
-                    html = fp.read()
-
-                buf = html2docx(html, title=path.name)
-                doc = docx.Document(buf)
-
-                self.assertEqual(doc.core_properties.title, path.name)
-                self.assertEqual(len(doc.paragraphs), len(spec))
-                for p, p_spec in zip(doc.paragraphs, spec):
-                    self.assertEqual(p.text, p_spec["text"])
-                    self.assertEqual(p.style.name, p_spec.get("style", "Normal"))
-
-                    runs_spec = p_spec["runs"]
-                    self.assertEqual(len(p.runs), len(runs_spec))
-                    for run, run_spec in zip(p.runs, runs_spec):
-                        self.assertEqual(run.text, run_spec["text"])
-                        self.assertEqual(
-                            run.bold,
-                            run_spec.get("bold", False),
-                            f"Wrong bold for text '{run.text}'.",
-                        )
-                        self.assertEqual(
-                            run.italic,
-                            run_spec.get("italic", False),
-                            f"Wrong italic for text '{run.text}'.",
-                        )
-                        self.assertEqual(
-                            run.underline,
-                            run_spec.get("underline", False),
-                            f"Wrong underline for text '{run.text}'.",
-                        )
diff --git a/tox.ini b/tox.ini
index c02012a..ab7026f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,8 @@ envlist =
 minversion = 1.9
 
 [testenv]
-commands = python -m unittest
+commands = pytest {posargs}
+deps = pytest
 
 [testenv:black]
 commands = black --target-version=py36 --check --diff .