add pytest

tests/test_page_title.py

@@ -0,0 +1,21 @@
+from nicegui import ui
+
+from .screen import Screen
+
+
+def test_page_title(screen: Screen):
+    ui.page_title('Initial title')
+    ui.button('Change title', on_click=lambda: ui.page_title('"New title"'))
+
+    @ui.page('/{title}')
+    def page(title: str):
+        ui.page_title(f'Title: {title}')
+
+    screen.open('/')
+    screen.should_contain('Initial title')
+
+    screen.click('Change title')
+    screen.should_contain('"New title"')
+
+    screen.open('/test')
+    screen.should_contain('Title: test')