// This tests sharding an existing collection that both shards are aware of (SERVER-2828)
import {ShardingTest} from "jstests/libs/shardingtest.js";

let st = new ShardingTest({shards: 2, mongos: 2});

assert.commandWorked(st.s0.adminCommand({enablesharding: "test", primaryShard: st.shard1.shardName}));

assert.commandWorked(st.s0.adminCommand({shardcollection: "test.foo", key: {num: 1}}));

assert.commandWorked(st.s0.getDB("test").existing.insert({_id: 1}));
assert.eq(1, st.s0.getDB("test").existing.count({_id: 1}));
assert.eq(1, st.s1.getDB("test").existing.count({_id: 1}));

assert.commandWorked(st.s1.adminCommand({shardcollection: "test.existing", key: {_id: 1}}));
assert.eq(true, st.s1.getDB("test").existing.stats().sharded);

assert.commandWorked(
    st.s1.getDB("admin").runCommand({
        moveChunk: "test.existing",
        find: {_id: 1},
        to: st.getOther(st.getPrimaryShard("test")).name,
    }),
);

assert.eq(1, st.s0.getDB("test").existing.count({_id: 1}));
assert.eq(1, st.s1.getDB("test").existing.count({_id: 1}));

st.stop();