Fixes AIO Callback testing with Dash-Duo #2062
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This PR fixes #1933. The AIO components are unable to be tested using Pytest and the Dash-Duo object. The callbacks set via
dash.callback
(rather thanapp.callback
) are added to a global map that is cleared after the first instance ofdash.Dash._setup_server
.To get around this, I'm currently exploring whether it is possible to leave the
GLOBAL_CALLBACK_MAP
andGLOBAL_CALLBACK_LIST
populated rather than clearing them on setup.Contributor Checklist
If not, explore whether we can have another MAP as suggested by @T4rk1n in [BUG] dash_duo does not work with All-in-One components #1933CHANGELOG.md