Add integration test for power_state_change module (#717)

Also introduce the `unstable` mark, to allow us to land tests which
run inconsistently (such as this one).

1 files changed, 13 insertions, 0 deletions

diff --git a/tests/integration_tests/log_utils.py b/tests/integration_tests/log_utils.py
new file mode 100644
index 00000000..fa807389
--- /dev/null
+++ b/tests/integration_tests/log_utils.py
@@ -0,0 +1,13 @@
+def ordered_items_in_text(to_verify: list, text: str) -> bool:
+    """Return if all items in list appear in order in text.
+
+    Examples:
+      ordered_items_in_text(['a', '1'], 'ab1')  # Returns True
+      ordered_items_in_text(['1', 'a'], 'ab1')  # Returns False
+    """
+    index = 0
+    for item in to_verify:
+        index = text[index:].find(item)
+        if index < 0:
+            return False
+    return True