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db.somecollection.drop();
assert.eq(0, db.system.namespaces.find({name: /somecollection/}).length(), "1");
db.somecollection.save({a: 1});
assert.eq(2, db.system.namespaces.find({name: /somecollection/}).length(), "2");
db.somecollection.ensureIndex({a: 1});
var z = db.system.namespaces.find({name: /somecollection/}).length();
assert.gte(z, 1, "3");
if (z == 1)
print("warning: z==1, should only happen with alternate storage engines");
db.somecollection.drop();
assert.eq(0, db.system.namespaces.find({name: /somecollection/}).length(), "4");
db.somecollection.save({a: 1});
assert.eq(2, db.system.namespaces.find({name: /somecollection/}).length(), "5");
db.somecollection.ensureIndex({a: 1});
var x = db.system.namespaces.find({name: /somecollection/}).length();
assert(x == 2 || x == z, "6");
assert(db.somecollection.validate().valid, "7");
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