Add test for correct listen behavior.

tests/listen.chk

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+
+Welcome to Adventure!!  Would you like instructions?
+
+> no
+
+You are standing at the end of a road before a small brick building.
+Around you is a forest.  A small stream flows out of the building and
+down a gully.
+
+> seed 1181530211
+
+Seed set to 1181530211
+
+You're in front of building.
+
+> e
+
+You are inside a building, a well house for a large spring.
+
+There are some keys on the ground here.
+
+There is a shiny brass lamp nearby.
+
+There is food here.
+
+There is a bottle of water here.
+
+> get lamp
+
+OK
+
+> xyzzy
+
+>>Foof!<<
+
+It is now pitch dark.  If you proceed you will likely fall into a pit.
+
+> on
+
+Your lamp is now on.
+
+You are in a debris room filled with stuff washed in from the surface.
+A low wide passage with cobbles becomes plugged with mud and debris
+here, but an awkward canyon leads upward and west.  In the mud someone
+has scrawled, "MAGIC WORD XYZZY".
+
+A three foot black rod with a rusty star on an end lies nearby.
+
+> e
+
+You are crawling over cobbles in a low passage.  There is a dim light
+at the east end of the passage.
+
+There is a small wicker cage discarded nearby.
+
+> get cage
+
+OK
+
+> pit
+
+At your feet is a small pit breathing traces of white mist.  An east
+passage ends here except for a small crack leading on.
+
+Rough stone steps lead down the pit.
+
+> e
+
+You are in a splendid chamber thirty feet high.  The walls are frozen
+rivers of orange stone.  An awkward canyon and a good passage exit
+from east and west sides of the chamber.
+
+A cheerful little bird is sitting here singing.
+
+> get bird
+
+OK
+
+> debri
+
+You're in debris room.
+
+A three foot black rod with a rusty star on an end lies nearby.
+
+> xyzzy
+
+>>Foof!<<
+
+You're inside building.
+
+There are some keys on the ground here.
+
+There is food here.
+
+There is a bottle of water here.
+
+> listen
+
+The stream is gurgling placidly.
+
+The bird does not seem inclined to sing while in the cage.
+
+> xyzzy
+
+>>Foof!<<
+
+You're in debris room.
+
+A three foot black rod with a rusty star on an end lies nearby.
+
+> pit
+
+You're at top of small pit.
+
+Rough stone steps lead down the pit.
+
+> d
+
+You are at one end of a vast hall stretching forward out of sight to
+the west.  There are openings to either side.  Nearby, a wide stone
+staircase leads downward.  The hall is filled with wisps of white mist
+swaying to and fro almost as if alive.  A cold wind blows up the
+staircase.  There is a passage at the top of a dome behind you.
+
+Rough stone steps lead up the dome.
+
+> d
+
+You are in the Hall of the Mountain King, with passages off in all
+directions.
+
+A huge green fierce snake bars the way!
+
+> listen
+
+The bird does not seem inclined to sing while in the cage.
+
+The snake is hissing venomously.
+
+> secret
+
+You are in a secret canyon which here runs e/w.  It crosses over a
+very tight canyon 15 feet below.  If you go down you may not be able
+to get back up.
+
+> w
+
+You are in a secret canyon which exits to the north and east.
+
+A huge green fierce dragon bars the way!
+
+The dragon is sprawled out on a Persian rug!!
+
+> listen
+
+The bird does not seem inclined to sing while in the cage.
+
+The dragon's ominous hissing does not bode well for you.
+
+> quit
+
+Do you really want to quit now?
+
+> yes
+
+OK
+
+You scored 59 out of a possible 430, using 21 turns.
+
+Your score qualifies you as a novice class adventurer.
+
+To achieve the next higher rating, you need 62 more points.

tests/listen.log

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+## Check that listen command hears all objects as well as location sound
+no
+seed 1181530211
+e
+get lamp
+xyzzy
+on
+e
+get cage
+pit
+e
+get bird
+debri
+xyzzy
+listen
+xyzzy
+pit
+d
+d
+listen
+secret
+w
+listen
+quit
+yes