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mongo/jstests/core/capped_empty.js

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t = db.capped_empty;
t.drop();
db.createCollection(t.getName(), {capped: true, size: 100});
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t.insert({x: 1});
t.insert({x: 2});
t.insert({x: 3});
t.ensureIndex({x: 1});
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assert.eq(3, t.count());
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t.runCommand("emptycapped");
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assert.eq(0, t.count());
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t.insert({x: 1});
t.insert({x: 2});
t.insert({x: 3});
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assert.eq(3, t.count());