db.jstests_error1.drop();

// test 1
db.runCommand({reseterror: 1});
assert(db.runCommand({getlasterror: 1}).err == null, "A");
assert(db.runCommand({getpreverror: 1}).err == null, "B");

db.resetError();
assert(db.getLastError() == null, "C");
assert(db.getPrevError().err == null, "preverror 1");

// test 2

db.runCommand({forceerror: 1});
assert(db.runCommand({getlasterror: 1}).err != null, "D");
assert(db.runCommand({getpreverror: 1}).err != null, "E");

assert(db.getLastError() != null, "F");
assert(db.getPrevError().err != null, "preverror 2");
assert(db.getPrevError().nPrev == 1, "G");

db.jstests_error1.findOne();
assert(db.runCommand({getlasterror: 1}).err == null, "H");
assert(db.runCommand({getpreverror: 1}).err != null, "I");
assert(db.runCommand({getpreverror: 1}).nPrev == 2, "J");

db.jstests_error1.findOne();
assert(db.runCommand({getlasterror: 1}).err == null, "K");
assert(db.runCommand({getpreverror: 1}).err != null, "L");
assert(db.runCommand({getpreverror: 1}).nPrev == 3, "M");

db.resetError();
db.forceError();
db.jstests_error1.findOne();
assert(db.getLastError() == null, "getLastError 5");
assert(db.getPrevError().err != null, "preverror 3");

// test 3
db.runCommand({reseterror: 1});
assert(db.runCommand({getpreverror: 1}).err == null, "N");