https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/help-with-writing-unit-tests-asmutable-is-not-a/m-p/1332963#M82335 <P>Hi</P><P>Im trying to get my head around writing unit tests for me Experience Builder widgets using Jest.</P><P>Im finding the Ersi docs/example quite limited, there are only 2 widgets in the samples folder with tests!</P><P>Anyway, My first hickup is, in my widget code, the config is an immutable object, and it gets copied using config.asMutable() ... jest complains that asMutable() is not a function.&nbsp; How should I work around this?</P><P>I have other cases such as using the SessionManager, do I need to mock these?</P><P>Thanks for any tips</P><P>Adam</P> Wed, 27 Sep 2023 15:30:54 GMT AdamPigg 2023-09-27T15:30:54Z https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/help-with-writing-unit-tests-asmutable-is-not-a/m-p/1332963#M82335 <P>Hi</P><P>Im trying to get my head around writing unit tests for me Experience Builder widgets using Jest.</P><P>Im finding the Ersi docs/example quite limited, there are only 2 widgets in the samples folder with tests!</P><P>Anyway, My first hickup is, in my widget code, the config is an immutable object, and it gets copied using config.asMutable() ... jest complains that asMutable() is not a function.&nbsp; How should I work around this?</P><P>I have other cases such as using the SessionManager, do I need to mock these?</P><P>Thanks for any tips</P><P>Adam</P> Wed, 27 Sep 2023 15:30:54 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/help-with-writing-unit-tests-asmutable-is-not-a/m-p/1332963#M82335 AdamPigg 2023-09-27T15:30:54Z