Fix potential infinite loop if incomplete lists returned (#920)

Fixes the test framework to handle fixtures with incomplete lists better by checking for completeness and overriding the sum. Also adds a pytest-timeout dev dependency with timeout set to 10 seconds. Finally fixes smartprotocol to prevent an infinite loop if incomplete lists ever happens in the real world.

Co-authored-by: Teemu R. <tpr@iki.fi>

pyproject.toml

@@ -57,6 +57,7 @@ pytest-mock = "*"
 codecov = "*"
 xdoctest = "*"
 coverage = {version = "*", extras = ["toml"]}
+pytest-timeout = "^2"
 
 [tool.poetry.extras]
 docs = ["sphinx", "sphinx_rtd_theme", "sphinxcontrib-programoutput", "myst-parser", "docutils"]
@@ -89,6 +90,7 @@ markers = [
     "requires_dummy: test requires dummy data to pass, skipped on real devices",
 ]
 asyncio_mode = "auto"
+timeout = 10
 
 [tool.doc8]
 paths = ["docs"]