Make overlay tests more robust (#726)

Author: tcbegley

tests/test_popover.py

@@ -27,7 +27,7 @@ def test_dbpo001_popover_click(dash_duo):
     dash_duo.start_server(app)
 
     dash_duo.wait_for_element_by_id("popover-target").click()
-    assert dash_duo.wait_for_element(".popover-body").text == "Test content"
+    dash_duo.wait_for_text_to_equal(".popover-body", "Test content", timeout=4)
 
 
 def test_dbpo002_popover_hover(dash_duo):
@@ -52,4 +52,4 @@ def test_dbpo002_popover_hover(dash_duo):
         dash_duo.wait_for_element_by_id("popover-target")
     )
     hover.perform()
-    assert dash_duo.wait_for_element(".popover-body").text == "Test content"
+    dash_duo.wait_for_text_to_equal(".popover-body", "Test content", timeout=4)

tests/test_tooltip.py

@@ -20,4 +20,6 @@ def test_dbtt001_tooltip_content(dash_duo):
         dash_duo.wait_for_element_by_id("tooltip-target")
     )
     hover.perform()
-    assert dash_duo.wait_for_element(".tooltip-inner").text == "Test content"
+    dash_duo.wait_for_text_to_equal(
+        ".tooltip-inner", "Test content", timeout=4
+    )