effect-tea-persistent
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    rehearse: typeof rehearseOne & { together: typeof together } = ...

    Runs a scenario of one entity of program, created from start.flags at start.at, without a database or a clock. A program whose flags are null may leave start.flags out (decision 0245). The scenario is given a Rehearsal, and the test answers the entity's operations, fires its timers and restarts the process. rehearse.together(at, scenario) runs several entities in one world instead, where a runner's requests reach the other entities.