Three ExoPlayerPluginTest fallback cases failed after commandForSource started rejecting a load with no native player: the test core seamed property writes but not commands, so every fallback loadfile reported OPEN_FAILED. The core now takes an optional command runner beside the property writer; with none, a command without a native player still fails. The tests assert what mpv was handed — the loadfile URI as open ownership and its pause option as playback intent — instead of reflecting private flags, and one sets up its held state through setPauseIntentForLoad. ExoPlayer production behavior is unchanged.
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