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a = db.rename3a;
b = db.rename3b;
a.drop();
b.drop();
a.save({x: 1});
b.save({x: 2});
assert.eq(1, a.findOne().x, "before 1a");
assert.eq(2, b.findOne().x, "before 2a");
res = b.renameCollection(a._shortName);
assert.eq(0, res.ok, "should fail: " + tojson(res));
assert.eq(1, a.findOne().x, "before 1b");
assert.eq(2, b.findOne().x, "before 2b");
res = b.renameCollection(a._shortName, true);
assert.eq(1, res.ok, "should succeed:" + tojson(res));
assert.eq(2, a.findOne().x, "after 1");
assert.isnull(b.findOne(), "after 2");
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