text: // ***************************************************************
  // rename7.js
  // Test renameCollection functionality across different databases.
  // ***************************************************************
  
  // Set up namespaces a and b.
  admin = db.getMongo().getDB( "admin" );
  db_a = db.getMongo().getDB( "db_a" );
  db_b = db.getMongo().getDB( "db_b" );
  a = db_a.rename7;
  b = db_b.rename7;
  
  a.drop();
  b.drop();
  
  // Put some documents and indexes in a.
  a.save( {a: 1} );
  a.save( {a: 2} );
  a.save( {a: 3} );
  a.ensureIndex( {a: 1} );
  a.ensureIndex( {b: 1} );
  
  assert.commandWorked( admin.runCommand( {renameCollection: "db_a.rename7", to: "db_b.rename7"} ) );
  
  assert.eq( 0, a.find().count() );
  assert( !db_a.system.namespaces.findOne( {name: "db_a.rename7"} ) );
  
  assert.eq( 3, b.find().count() );
  assert( db_b.system.namespaces.findOne( {name: "db_b.rename7"} ) );
  assert( b.find( {a: 1} ).explain().cursor.match( /^BtreeCursor/ ) );
  
  a.drop();
  b.drop();
  
  // Capped collection testing.
  db_a.createCollection( "rename7_capped", {capped:true, size:10000} );
  a = db_a.rename7_capped;
  b = db_b.rename7_capped;
  
  a.save( {a: 1} );
  a.save( {a: 2} );
  a.save( {a: 3} );
  
  assert.commandWorked( admin.runCommand( {renameCollection: "db_a.rename7_capped",
                                           to: "db_b.rename7_capped"} ) );
  
  assert.eq( 0, a.find().count() );
  assert( !db_a.system.namespaces.findOne( {name: "db_a.rename7_capped"} ) );
  
  assert.eq( 3, b.find().count() );
  assert( db_b.system.namespaces.findOne( {name: "db_b.rename7_capped"} ) );
  assert.eq( true, db_b.system.namespaces.findOne( {name:"db_b.rename7_capped"} ).options.capped );
  assert.eq( 12288, b.stats().storageSize );
  
  a.drop();
  b.drop();
  