fix xpath selector changes when .child .xpath called, #close 942

.github/workflows/main.yml

@@ -1,6 +1,14 @@
 name: Python application
 
-on: [push]
+on:
+  push:
+    branches:
+      - master
+    tags-ignore:
+      - '*'
+  pull_request:
+    branches:
+      - master
 
 jobs:
   build-and-publish:

tests/real_device/test_xpath.py

@@ -3,13 +3,25 @@
 
 import threading
 from functools import partial
-from pprint import pprint
 
 import pytest
-
 import uiautomator2 as u2
 
 
+def test_xpath_selector(sess: u2.Session):
+    sel1 = sess.xpath("/a")
+    print(str(sel1), type(str(sel1)))
+    assert str(sel1).endswith("=/a")
+    assert str(sel1.child("/b")).endswith("=/a/b")
+    assert str(sel1).endswith("=/a") # sel1 should not be changed
+    assert str(sel1.xpath("/b")).endswith("=/a|/b")
+    assert str(sel1.xpath(["/b", "/c"])).endswith("=/a|/b|/c")
+    assert sel1.position(0.1, 0.1) != sel1
+    assert sel1.fallback("click") != sel1
+    with pytest.raises(ValueError):
+        sel1.fallback("invalid-action")
+
+
 def test_get_text(sess: u2.Session):
     assert sess.xpath("App").get_text() == "App"
 
@@ -24,10 +36,11 @@ def test_swipe(sess: u2.Session):
     d = sess
     d.xpath("App").click()
     d.xpath("Alarm").wait()
-    #assert not d.xpath("Voice Recognition").exists
+    # assert not d.xpath("Voice Recognition").exists
     d.xpath("@android:id/list").get().swipe("up", 0.5)
     assert d.xpath("Voice Recognition").wait()
 
+
 def test_xpath_query(sess: u2.Session):
     assert sess.xpath("Accessibility").wait()
     assert sess.xpath("%ccessibility").wait()
@@ -46,40 +59,22 @@ def test_watcher(sess: u2.Session, request):
     sess.xpath.watch_background(interval=1.0)
 
     event = threading.Event()
+
     def _set_event(e):
         e.set()
 
     sess.xpath.when("Action Bar").call(partial(_set_event, event))
     assert event.wait(5.0), "xpath not trigger callback"
 
 
-@pytest.mark.skip("Deprecated")
-def test_watcher_from_yaml(sess: u2.Session, request):
-    yaml_content = """---
-- when: App
-  then: click
-- when: Action Bar
-  then: >
-    def callback(d):
-        print("D:", d)
-        d.xpath("Alarm").click()
-
-    def hello():
-        print("World")
-"""
-    sess.xpath.apply_watch_from_yaml(yaml_content)
-    sess.xpath.watch_background(interval=1.0)
-
-    assert sess.xpath("Alarm Controller").wait(timeout=10)
-
-
 def test_xpath_scroll_to(sess: u2.Session):
     d = sess
     d.xpath("Graphics").click()
     d.xpath("@android:id/list").scroll_to("Pictures")
     assert d.xpath("Pictures").exists
 
+
 def test_xpath_parent(sess: u2.Session):
     d = sess
     info = d.xpath("App").parent("@android:id/list").info
-    assert info['resourceId'] == 'android:id/list'
+    assert info["resourceId"] == "android:id/list"