diff --git a/.gitignore b/.gitignore
index eb5f3ce..97d153d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 *.DS_Store
 /env
 build
-dist
\ No newline at end of file
+dist
+tests/__pycache__/test_class_demo.cpython-311-pytest-7.4.4.pyc
diff --git a/tests/test_class_demo.py b/tests/test_class_demo.py
new file mode 100644
index 0000000..07a1696
--- /dev/null
+++ b/tests/test_class_demo.py
@@ -0,0 +1,9 @@
+class TestClassDemoInstance:
+    value = 0
+
+    def test_one(self):
+        self.value = 1
+        assert self.value == 1
+
+    def test_two(self):
+        assert self.value != 1
\ No newline at end of file