assert.throws( function() {
    t.runCommand('geoNear', {near: [50,50], num: -1})
}, {}, "num: -1" )

ue Jan 29 14:38:07.861 [conn2]  test.geo2 Assertion failure numWanted >= 0 src/mongo/db/geo/2d.cpp 2384
0x106c34a8b 0x106c0e91c 0x106993e3e 0x1069a7b10 0x10678d9a5 0x10678e8e3 0x10678f195 0x106a3160e 0x106a31e11 0x1069dec7f 0x10665cb02 0x106c2a579 0x106c67145 0x7fff92d78742 0x7fff92d65181 
 0   mongod                              0x0000000106c34a8b _ZN5mongo15printStackTraceERSo + 43
 1   mongod                              0x0000000106c0e91c _ZN5mongo12verifyFailedEPKcS1_j + 284
 2   mongod                              0x0000000106993e3e _ZN5mongo12run2DGeoNearERKNS_12IndexDetailsERNS_7BSONObjERSsRNS_14BSONObjBuilderE + 5518
 3   mongod                              0x00000001069a7b10 _ZN5mongo16Geo2dFindNearCmd3runERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderEb + 660
 4   mongod                              0x000000010678d9a5 _ZN5mongo12_execCommandEPNS_7CommandERKSsRNS_7BSONObjEiRSsRNS_14BSONObjBuilderEb + 37
 5   mongod                              0x000000010678e8e3 _ZN5mongo7Command11execCommandEPS0_RNS_6ClientEiPKcRNS_7BSONObjERNS_14BSONObjBuilderEb + 2523
 6   mongod                              0x000000010678f195 _ZN5mongo12_runCommandsEPKcRNS_7BSONObjERNS_11_BufBuilderINS_16TrivialAllocatorEEERNS_14BSONObjBuilderEbi + 1013
 7   mongod                              0x0000000106a3160e _ZN5mongo11runCommandsEPKcRNS_7BSONObjERNS_5CurOpERNS_11_BufBuilderINS_16TrivialAllocatorEEERNS_14BSONObjBuilderEbi + 46
 8   mongod                              0x0000000106a31e11 _ZN5mongo8runQueryERNS_7MessageERNS_12QueryMessageERNS_5CurOpES1_ + 1553
 9   mongod                              0x00000001069dec7f _ZN5mongo16assembleResponseERNS_7MessageERNS_10DbResponseERKNS_11HostAndPortE + 1519
 10  mongod                              0x000000010665cb02 _ZN5mongo16MyMessageHandler7processERNS_7MessageEPNS_21AbstractMessagingPortEPNS_9LastErrorE + 198
 11  mongod                              0x0000000106c2a579 _ZN5mongo17PortMessageServer17handleIncomingMsgEPv + 1657
 12  mongod                              0x0000000106c67145 thread_proxy + 229
 13  libsystem_c.dylib                   0x00007fff92d78742 _pthread_start + 327
 14  libsystem_c.dylib                   0x00007fff92d65181 thread_start + 13

ssert: did not throw exception: num: -1
Error: Printing Stack Trace
    at printStackTrace (src/mongo/shell/utils.js:37:7)
    at doassert (src/mongo/shell/utils.js:58:1)
    at Function.assert.throws (src/mongo/shell/utils.js:204:1)
    at /Users/slee/Source/mongodb-src-r2.3.2/jstests/geo2.js:54:8
Tue Jan 29 14:38:07.868 javascript execution failed src/mongo/shell/utils.js:59 did not throw exception: num: -1
throw msg;