This release is a pre-release and may not be stable for production use.
The Python test runner built for precision.
▸ Zero plugins. Full arsenal.
Test Junkie 
Test Junkie is a Python test runner and test framework with built-in parallel test execution, exception-aware
retries, multi-layer parametrization, event listeners and HTML/XML reports — everything in one package, no plugins.
Use it from Python with Runner or from the terminal with the tj command.
Key Features
Not a wrapper around
unittest. Every capability below ships with the library — no plugins to install, no config files to write, no external orchestrators.
- Decorator-based:
@Suiteand@teston plain Python classes — no base class to extend, no config file to maintain - Lifecycle hooks:
@beforeClass,@afterClass,@beforeTest,@afterTeston the class, plus@beforeGroup/@afterGroup(via@GroupRules) that run once around a named set of suites - Built-in parallel execution: separate thread limits for suites (
-S/suite_multithreading_limit) and tests (-T/test_multithreading_limit);parallelized=Falsekeeps a suite or test out of the parallel pool, andpr=[...]stops specific suites or tests from ever overlapping - Retries:
retry=Non a suite or a test — only the failing parameter variants re-run;retry_on=[ConnectionError]retries just infrastructure noise,no_retry_on=[AssertionError]makes real bugs surface immediately - Multi-layer parametrization:
@Suite(parameters=[...])×@test(parameters=[...])= every combination, each variant tracked and retried on its own; parameters can be a function that builds the list at run time Rulesfor shared setup/teardown — definebefore_class/before_test/ … once, attach with@Suite(rules=...)to as many suites as you like- First-class
owner,feature,component,tagsandpriority— filter withtj run --owners,--features,--components,--run_on_match_any/--run_on_match_all(tags), orowners=/features=/components=/tag_config=inRunner.run() - Execution order per suite:
@Suite(order=TestOrder.RANDOM)(orALPHABETICAL,PRIORITY_ASC,PRIORITY_DESC) — e.g. shuffle one suite to surface order dependencies - Skipping:
skip=Trueor a function deciding at run time on any suite or test, andshortcuts.skip("reason")from inside a running test - Live event listeners: subclass
Listener, override any of its 21 events (on_failure,on_success,on_class_skip, …) and attach it with@Suite(listener=...) - Results as objects:
runner.get_executed_suites()returns typed suite/test objects with status, timing, retries, exceptions and metadata;Meta.update(...)adds to a test's metadata while it runs - Reports: HTML (with CPU and memory graphs when
monitor_resources=True) and XML, written to the paths you pass ashtml_report=/xml_report=; the JSON-ready report data is also returned byrunner.run() - CLI:
tj run,tj audit,tj config— run and inspect suites without writing a runner script;tj runexits non-zero on failures, errors or when nothing ran, ready for CI
And more →
Installation
pip install test-junkie
Quick example
from test_junkie.decorators import Suite, test, beforeClass
from test_junkie.runner import Runner
@Suite(feature="Login", owner="qa-team")
class LoginSuite:
@beforeClass()
def open_session(self):
self.session = {"user": "demo"}
@test(component="auth", tags=["smoke"], retry=2)
def valid_login(self):
assert self.session["user"] == "demo"
@test(component="auth", parameters=["", "wrong-password"])
def invalid_login(self, parameter):
assert parameter != "correct-password"
if __name__ == "__main__":
Runner([LoginSuite], html_report="report.html").run(test_multithreading_limit=4)
Or from the terminal: tj run -s path/to/tests -T 4 --html_report report.html
Python 2.7: the last release with Python 2.7 support is
0.8a.8. All versions from0.9a0onwards require Python 3.
Performance
Everything above ships in one package — no plugins to add for parallel runs or parametrization.
Package footprint — installed size, including the plugins each framework needs to match those features:
| Framework | Core (KB) | Parallel | Parametrization | Total (KB) |
|---|---|---|---|---|
| test_junkie | 621 | built-in | built-in | 621 |
| unittest | 528 | built-in (ThreadPoolExecutor) |
+139 (parameterized) |
667 |
| pytest | 2,932 | +532 (pytest-xdist) |
built-in | 3,464 |
| Robot Framework | 5,980 | +539 (robotframework-pabot) |
built-in | 6,519 |
Wall clock — N tests that each sleep 1 ms, process start to exit (median of 30 runs; every run verified to have passed all N tests):
| Framework | N = 1 | N = 100 | N = 1,000 | N = 1,000 · 10 workers |
|---|---|---|---|---|
| test_junkie | 95 ms | 296 ms | 1,972 ms | 308 ms |
| unittest | 92 ms | 289 ms | 2,028 ms | 268 ms ¹ |
| pytest | 296 ms | 573 ms | 2,741 ms | 2,064 ms (pytest-xdist) |
| Robot Framework | 308 ms | 581 ms | 3,395 ms | 85.3 s (pabot) ² |
¹ a bare ThreadPoolExecutor with no test runner. ² median of 3 runs; pabot starts a process per test.
Measured with test_junkie 0.9a5, pytest 9.1.1, Robot Framework 7.5 on Python 3.12.5 (Windows 11, Intel Core i9-10980HK). Parametrized and parallel results, per-phase timings and the exact commands are in the full benchmark →
Getting Started
1 maintainer
Metadata
1 maintainer
Release files for test-junkie 0.9a5
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