t = new ToolTest( "jsonparser" );

c = t.startDB("testcollection");

data = 'data/jsonparser';

key = "bindata";
key_value = BinData(5, "nhB9nTcrtoJr2B01QqQZ1g==");
c=t.db.getCollection("testcollection");
// true is to enable field names to start with $
// e.g. $undefined
c.insert({key: key_value}, true);
t.runTool( "export" , "--version");
t.runTool( "export" , "--out" , data , "-d" , t.baseName, "-c" , "testcollection");
c.drop();
assert.eq( 0 , c.count() , "after drop" );
t.runTool( "import" , "--version");
t.runTool( "import" , "--file" , data , "-d" , t.baseName, "-c" , "testcollection2");
c2=t.db.getCollection("testcollection2");
assert.soon( "c2.findOne()" , "read imported document" );
assert.eq( 1 , c2.count() , "1 doc after import" );

var doc = c2.findOne();
assert.eq( key_value , doc.key , "assert data type" );

c2.drop();
assert.eq( 0 , c2.count() , "after drop" );

assert: [BinData(5,"nhB9nTcrtoJr2B01QqQZ1g==")] != [BinData(5,"77+9EH3vv703K++/ve+/vQ==")] are not equal : assert data type
Error: Printing Stack Trace
    at printStackTrace (src/mongo/shell/utils.js:37:7)
    at doassert (src/mongo/shell/assert.js:6:1)
    at Function.assert.eq (src/mongo/shell/assert.js:32:1)
    at test_round_trip (jsonparser-undefined.js:22:16)
    at jsonparser-undefined.js:31:1
Wed Feb 20 16:38:16.332 [BinData(5,"nhB9nTcrtoJr2B01QqQZ1g==")] != [BinData(5,"77+9EH3vv703K++/ve+/vQ==")] are not equal : assert data type src/mongo/shell/assert.js:7
failed to load: jsonparser-undefined.js

{ "_id" : { "$oid" : "5124fd42876fdb24f52e5722" }, "bindata" : { "$binary" : "nhB9nTcrtoJr2B01QqQZ1g==", "$type" : "05" } }

{
  "_id": ObjectId("512503b4c35f6f6101d2b9c6"),
  "key": BinData(5, "77+9EH3vv703K++/ve+/vQ==")
}