sinonjs/sinon

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Test spies, stubs and mocks for JavaScript.

Stars: 9.8k
Forks: 808
Open beginner issues: 0
Indexed issues: 43

Dominant language: JavaScript
License: No license data
Last GitHub push: Jul 20, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted hacktoberfest good first issue
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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43 open issues indexed

createStubInstance() doesn't receive per-sandbox callId context, breaking calledAfter/calledBefore vs spy() Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

sinonjs/sinon#2760 · 1 reaction · Opened Aug 9, 2026
Move documentation site to CloudFlare Pages Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

sinonjs/sinon#2742 · 2 reactions · Opened Jul 1, 2026
Add tutorial pages to docs Open

Documentation

Difficulty 4/5 3-5 days Newbie friendliness 55/100

sinonjs/sinon#2739 · Opened Jun 30, 2026
Feature request: Addition of Canary Credentials to detect compromise Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

sinonjs/sinon#2719 · Opened Jun 1, 2026
How to stub ES module imports documentation is incorrect Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

sinonjs/sinon#2714 · 1 comment · 1 reaction · Opened May 15, 2026
Consider Adopting NPM Trusted Publishing Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

sinonjs/sinon#2665 · 4 comments · Opened Oct 21, 2025
callsFake() on mocks only returns a value the first time Open

Bug Unverified

Difficulty 3/5 1-2 days Newbie friendliness 45/100

sinonjs/sinon#2663 · Opened Sep 13, 2025
Support explicit resource management Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

sinonjs/sinon#2662 · 5 comments · 4 reactions · Opened Aug 9, 2025
Replace sinon.assert.pass() with an event listener Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

sinonjs/sinon#2657 · Opened Jun 9, 2025
Improve migration guide re v20 Open

Difficulty 1/5 1-3 hours Newbie friendliness 45/100

sinonjs/sinon#2652 · 5 comments · 4 reactions · Opened Mar 24, 2025
Use knip instead of unimported Open

good first issue Help wanted

sinonjs/sinon#2637 · 2 comments · 1 assignee · Opened Feb 10, 2025
Error when stubbing a property that does not exist Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

sinonjs/sinon#2629 · 2 comments · 1 reaction · Opened Nov 27, 2024
RFC: stubbing fonction expressions in ESM modules Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

sinonjs/sinon#2621 · 4 comments · Opened Oct 8, 2024
Add more specific information in the migration guide to v19 about Fake Timers and toFake Open

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

sinonjs/sinon#2620 · 3 comments · Opened Oct 1, 2024
Remove Browserify in favor of ESBuild (already used in Mochify) Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

sinonjs/sinon#2618 · 1 comment · 1 reaction · Opened Sep 13, 2024
Automate Release Process + Provenance Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

sinonjs/sinon#2606 · 6 comments · 1 reaction · Opened Aug 9, 2024
Feature Request: Add API support to stub a parent class constructor. Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

sinonjs/sinon#2578 · 5 comments · Opened Jan 8, 2024
Elaborate on "For the stubbing to work, the stubbed method cannot be destructured, neither in the module under test nor in the test." Open

Difficulty 1/5 1-3 hours Newbie friendliness 42/100

sinonjs/sinon#2552 · 7 comments · Opened Sep 30, 2023
Throw meaningful error message when trying to return non-objects from stub used as constructor Open

Documentation wontfix

Difficulty 3/5 1-2 days Newbie friendliness 35/100

sinonjs/sinon#2532 · 1 comment · Opened Aug 9, 2023
sinon not throwing the error that been thrown when the error is undefined and also fail to assert Open

Difficulty: Easy Help wanted wontfix

Difficulty 3/5 1-2 days Newbie friendliness 45/100

sinonjs/sinon#2471 · 3 comments · Opened Sep 11, 2022
sandbox.restore() does not work on static members of a function or class Open

Bug Difficulty: Medium Help wanted wontfix

Difficulty 3/5 1-2 days Newbie friendliness 42/100

sinonjs/sinon#2384 · 18 comments · 2 reactions · Opened Jun 16, 2021
Prevent matcher failures from printing large deeply nested objects Open

Help wanted Improvement pinned

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sinonjs/sinon#2306 · 2 comments · 4 reactions · Opened Oct 21, 2020
sinon.assert.calledOnceWithExactly() does not accept a single spy call Open

Bug pinned

Difficulty 3/5 1-2 days Newbie friendliness 48/100

sinonjs/sinon#2277 · 7 comments · 1 reaction · Opened Jul 20, 2020
Add breaking changes to GitHub release notes Open

hacktoberfest Help wanted pinned

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sinonjs/sinon#2268 · 9 comments · Opened Jun 15, 2020
Simplify/make props definition consistent Open

Difficulty: Medium hacktoberfest Help wanted Improvement pinned

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sinonjs/sinon#2238 · 2 comments · Opened Mar 9, 2020
Extract sandbox and fake into separate modules Open

pinned

Difficulty 5/5 Over a week Newbie friendliness 20/100

sinonjs/sinon#2145 · 12 comments · 4 reactions · Opened Oct 18, 2019
Mock throws exception when called twice Open

pinned

Difficulty 3/5 1-2 days Newbie friendliness 48/100

sinonjs/sinon#2046 · 5 comments · 2 reactions · Opened Jun 15, 2019
"API Specification" Style Documentation Open

Documentation hacktoberfest Help wanted Needs investigation pinned

Difficulty 5/5 Over a week Newbie friendliness 25/100

sinonjs/sinon#2003 · 14 comments · 1 reaction · Opened Apr 2, 2019
Document how we can control Promises Open

Documentation good first issue hacktoberfest Help wanted pinned

Difficulty 4/5 3-5 days Newbie friendliness 25/100

sinonjs/sinon#1898 · 8 comments · Opened Sep 9, 2018
returnValue of calls is out of order when spying on recursive functions Open

pinned

Difficulty 3/5 1-2 days Newbie friendliness 35/100

sinonjs/sinon#1849 · 5 comments · Opened Jun 29, 2018
Cannot spy on property getters, and stubbed getters do not record calls Open

hacktoberfest Help wanted pinned Property accessors

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sinonjs/sinon#1741 · 27 comments · Opened Mar 21, 2018
Spy's thisValue not pointing to instance when spying constructor Open

Bug Difficulty: Medium hacktoberfest Help wanted pinned Regression

Difficulty 3/5 1-2 days Newbie friendliness 42/100

sinonjs/sinon#1683 · 11 comments · Opened Feb 9, 2018
How can we override reject creating a new Error Object? Open

Documentation Feature Request pinned

Difficulty 3/5 1-2 days Newbie friendliness 42/100

sinonjs/sinon#1679 · 14 comments · Opened Feb 1, 2018
Should we implement automated releases? Open

pinned Question

Difficulty 5/5 Over a week Newbie friendliness 25/100

sinonjs/sinon#1657 · 2 comments · 2 reactions · Opened Jan 16, 2018
Proposal: publish to npm using scopes Open

pinned Question

Difficulty 5/5 Over a week Newbie friendliness 25/100

sinonjs/sinon#1652 · 7 comments · 2 reactions · Opened Jan 13, 2018
Proposal: documentation overhaul and hostnames Open

pinned Question

Difficulty 5/5 Over a week Newbie friendliness 25/100

sinonjs/sinon#1651 · 17 comments · 1 reaction · Opened Jan 13, 2018
stub.withArgs() with matchers breaks subsequent stubbing Open

Bug pinned

Difficulty 4/5 3-5 days Newbie friendliness 38/100

sinonjs/sinon#1572 · 13 comments · 10 reactions · Opened Sep 26, 2017
Name differences Open

Difficulty: Medium hacktoberfest Help wanted pinned

Difficulty 5/5 Over a week Newbie friendliness 25/100

sinonjs/sinon#1509 · 3 comments · Opened Aug 3, 2017
Document how to stub out the network layer Open

Documentation hacktoberfest Help wanted pinned

sinonjs/sinon#1459 · 4 comments · 2 reactions · 1 assignee · Opened Jun 15, 2017
Document how to do simple dependency injection Open

Documentation good first issue hacktoberfest Help wanted pinned

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

sinonjs/sinon#1458 · 5 comments · 2 reactions · Opened Jun 15, 2017
Behaviour of deep matching inconsistent between arrays and objects. Open

pinned

Difficulty 3/5 1-2 days Newbie friendliness 42/100

sinonjs/sinon#1321 · 5 comments · Opened Mar 8, 2017
Create an article on how ES2015 classes relate to stubbing/spying Open

Documentation ES2015+ hacktoberfest Help wanted pinned

sinonjs/sinon#1121 · 6 comments · 13 reactions · 1 assignee · Opened Aug 8, 2016
stub#returnsArg supercedes stub#returns even if returns is called later Open

pinned

Difficulty 3/5 1-2 days Newbie friendliness 35/100

sinonjs/sinon#440 · 10 comments · 1 reaction · Opened Mar 24, 2014

sinonjs/sinon

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