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fix throws().callsFake() precedence #2497

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merged 1 commit into from
Mar 12, 2023

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@ziluvatar ziluvatar commented Mar 11, 2023

Purpose (TL;DR) - mandatory

Fixes #2496 by cleaning any previous exception* behavior when callsFake is used.

Background (Problem in detail)

Precedence among behaviors is defined by the behavior itself (cleaning other previously set behaviors) and by the order at invocation time.

Since throws behavior (exception and exceptionHandler) is the first one to run at invocation time, other behaviors can only define precedence on its own definition. That's why I modified callsFake behavior to clean throws

Solution

When callsFake is chained on a stub it cleans previous exception and exceptionHandler values which essentially invalidates any previous throws or throwsException behaviours.

Note: I think this fix should not break any current usage, because any attempt to run the stubbed function would have raised an exception already and the developer would have noticed the same I did notice: callsFake was ignored, so that, probably they applied some workaround like restoring + callsFake OR recreating the stub + callsFake.

How to verify - mandatory

Run:

const fn = sinon.stub().throws('not mocked');
fn.callsFake(() => 'mocked behavior')

console.log(fn())

You should see:

mocked behavior

Checklist for author

  • npm run lint passes
  • n/a References to standard library functions are cached.

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codecov bot commented Mar 11, 2023

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (45be60f) 95.95% compared to head (95576e2) 95.95%.

❗ Current head 95576e2 differs from pull request most recent head 4aab223. Consider uploading reports for the commit 4aab223 to get more accurate results

Additional details and impacted files
@@           Coverage Diff           @@
##             main    #2497   +/-   ##
=======================================
  Coverage   95.95%   95.95%           
=======================================
  Files          38       38           
  Lines        1878     1880    +2     
=======================================
+ Hits         1802     1804    +2     
  Misses         76       76           
Flag Coverage Δ
unit 95.95% <100.00%> (+<0.01%) ⬆️

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Impacted Files Coverage Δ
lib/sinon/default-behaviors.js 100.00% <100.00%> (ø)

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@fatso83 fatso83 merged commit 6cbde9b into sinonjs:main Mar 12, 2023
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fatso83 commented Mar 12, 2023

This is great and works just like the rest. Thanks!

fatso83 pushed a commit that referenced this pull request Mar 12, 2023
This makes sure an unconditional `callsFake()` invoked on the same stub that was previously setup to throw will overwrite the previous behavior. This aligns it with the other behaviors.
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fatso83 commented Mar 12, 2023

published as sinon 15.0.2

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throws() keeps raising exception with callsFake()
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