added stuff

pytestdemo/demo.py

@@ -0,0 +1,22 @@
+from pathlib import Path
+
+
+def count_number_of_line(filename: str) -> int:
+    with open(filename, "rt") as file_:
+        return file_.read().count("\n")
+
+
+def test_naive() -> None:
+    # setup
+    temp_file = Path("/tmp/test_toto")
+    temp_file.write_text("allo\nmon\ncoco\n")
+    assert count_number_of_line(temp_file) == 3
+    temp_file.unlink()
+
+
+def test_with_basic_fixture(tmp_path: Path) -> None:
+    temp_file = tmp_path / "test_file"
+    temp_file.write_text("allo\nmon\ncoco\n")
+    assert count_number_of_line(temp_file) == 3
+
+