jstests/core/query/basic8.js


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// @tags: [requires_fastcount]

let t = db.basic8;
t.drop();

t.save({a: 1});
let o = t.findOne();
o.b = 2;
t.save(o);

assert.eq(1, t.find().count(), "A");
assert.eq(2, t.findOne().b, "B");