testresources
Testresources, a pyunit extension for managing expensive test resources
Decision gist · record as of 2026-08-14
Yes, if your test suite has expensive setup costs (databases, servers, large file systems) that you want to reuse across tests. The low install friction, permissive license, active maintenance, and mature codebase make it a safe choice. Not necessary for simple unit tests with lightweight setup—use it when resource reuse would materially reduce test execution time.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Incompatible with setUpClass and setUpModule—OptimisingTestSuite will flatten test suites using those features.
- Low friction install with no runtime dependencies.
License · maintenance · safety
Apache-2.0 or BSD (permissive) — Dual-licensed under Apache-2.0 or BSD, both permissive licenses. You can use, modify, and distribute this package with minimal restrictions in commercial or open-source projects.
last release 2026-04-21 (115 days) · last repo commit 2026-04-21 · 4 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 473,383 downloads/mo, #6,464 on PyPI
Alternatives
Verify before relying
import unittest
import testresources
class MyResource(testresources.TestResourceManager):
def make(self, dependency_resources):
return "resource_instance"
def clean(self, resource):
pass
class MyTest(unittest.TestCase, testresources.ResourcedTestCase):
resources = [('my_res', MyResource())]
def test_example(self):
assert self.my_res == "resource_instance"
def load_tests(loader, tests, pattern):
return testresources.OptimisingTestSuite(tests)- Whether the package is actively used in production or primarily maintained for legacy compatibility
- Performance impact of resource reuse optimization on typical test suites
What it is and what it does
testresources is a unittest extension that manages the lifecycle of expensive shared test resources—such as temporary databases, working directories, or running servers—across multiple test cases. Instead of creating and destroying these resources for every test, testresources tracks whether a resource is clean (reusable) or dirty (modified), allowing the test suite to reuse clean instances and minimize setup/teardown overhead. You declare resources your test needs via a resources attribute, and testresources automatically allocates them before setUp and disposes or recycles them after tearDown.
The package provides a TestResourceManager base class for defining custom resources, a ResourcedTestCase mixin to inject resources into test cases, and an OptimisingTestSuite that reorders tests to minimize resource churn. It has no runtime dependencies and supports modern Python versions (3.10–3.14) and PyPy. The dual Apache-2.0/BSD license is permissive, and the codebase is mature and actively maintained.
Use it for
- Optimize test suites that need expensive setup like database instances or VCS working trees by reusing clean resources across tests
- Manage temporary directories or file systems for integration tests while tracking whether they've been modified
- Pool shared web servers or network services across multiple test cases to reduce test execution time
- Declare resource dependencies between test fixtures so that dependent resources are allocated in the correct order
- Adapt existing resource-like classes or fixtures.Fixture instances to work with testresources via GenericResource or FixtureResource
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if your test suite has expensive setup costs (databases, servers, large file systems) that you want to reuse across tests.
The low install friction, permissive license, active maintenance, and mature codebase make it a safe choice. Not necessary for simple unit tests with lightweight setup—use it when resource reuse would materially reduce test execution time.
Install
testresources on PyPI
Before you install
Low friction install with no runtime dependencies. Active maintenance as of 2026-04-21 with support for Python 3.10 through 3.14 and PyPy. Mature codebase (Development Status 6) with a long history since 2009.
Requires Python 3.10 or later. Incompatible with setUpClass and setUpModule—OptimisingTestSuite will flatten test suites using those features.
License in practice
Dual-licensed under Apache-2.0 or BSD, both permissive licenses. You can use, modify, and distribute this package with minimal restrictions in commercial or open-source projects.
Quickstart
import unittest
import testresources
class MyResource(testresources.TestResourceManager):
def make(self, dependency_resources):
return "resource_instance"
def clean(self, resource):
pass
class MyTest(unittest.TestCase, testresources.ResourcedTestCase):
resources = [('my_res', MyResource())]
def test_example(self):
assert self.my_res == "resource_instance"
def load_tests(loader, tests, pattern):
return testresources.OptimisingTestSuite(tests)Verify before relying
- Whether the package is actively used in production or primarily maintained for legacy compatibility
- Performance impact of resource reuse optimization on typical test suites
Package facts
| License | Apache-2.0 or BSD permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 115 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 473,383 / month, #6,464 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 6 - MatureIntended Audience :: DevelopersLicense :: OSI Approved :: Apache Software LicenseLicense :: OSI Approved :: BSD LicenseOperating System :: OS IndependentProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: PyPyTopic :: Software Development :: Quality AssuranceTopic :: Software Development :: Testing |
Evidence: testresources-2.1.2-py3-none-any.whl
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