--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/planemo/lib/python3.7/site-packages/galaxy/tool_util/verify/wait.py	Fri Jul 31 00:32:28 2020 -0400
@@ -0,0 +1,28 @@
+"""Abstraction for waiting on API conditions to become true."""
+
+import time
+
+
+def wait_on(function, desc, timeout):
+    """Wait for function to return non-None value."""
+    delta = .25
+    iteration = 0
+    while True:
+        total_wait = delta * iteration
+        if total_wait > timeout:
+            timeout_message = "Timed out after %s seconds waiting on %s." % (
+                total_wait, desc
+            )
+            raise TimeoutAssertionError(timeout_message)
+        iteration += 1
+        value = function()
+        if value is not None:
+            return value
+        time.sleep(delta)
+
+
+class TimeoutAssertionError(AssertionError):
+    """Derivative of AssertionError indicating wait_on exceeded max time."""
+
+    def __init__(self, message):
+        super(TimeoutAssertionError, self).__init__(message)