start_server {tags {"dump"}} {
    test {DUMP / RESTORE are able to serialize / unserialize a simple key} {
        r set foo bar
        set encoded [r dump foo]
        r del foo
        list [r exists foo] [r restore foo 0 $encoded] [r ttl foo] [r get foo]
    } {0 OK -1 bar}

    test {RESTORE can set an arbitrary expire to the materialized key} {
        r set foo bar
        set encoded [r dump foo]
        r del foo
        r restore foo 5000 $encoded
        set ttl [r pttl foo]
        assert {$ttl >= 3000 && $ttl <= 5000}
        r get foo
    } {bar}

    test {RESTORE can set an expire that overflows a 32 bit integer} {
        r set foo bar
        set encoded [r dump foo]
        r del foo
        r restore foo 2569591501 $encoded
        set ttl [r pttl foo]
        assert {$ttl >= (2569591501-3000) && $ttl <= 2569591501}
        r get foo
    } {bar}

    test {RESTORE returns an error of the key already exists} {
        r set foo bar
        set e {}
        catch {r restore foo 0 "..."} e
        set e
    } {*BUSYKEY*}

    test {RESTORE can overwrite an existing key with REPLACE} {
        r set foo bar1
        set encoded1 [r dump foo]
        r set foo bar2
        set encoded2 [r dump foo]
        r del foo
        r restore foo 0 $encoded1
        r restore foo 0 $encoded2 replace
        r get foo
    } {bar2}

    test {RESTORE can detect a syntax error for unrecongized options} {
        catch {r restore foo 0 "..." invalid-option} e
        set e
    } {*syntax*}

    test {DUMP of non existing key returns nil} {
        r dump nonexisting_key
    } {}

    test {MIGRATE is caching connections} {
        # Note, we run this as first test so that the connection cache
        # is empty.
        set first [srv 0 client]
        r set key "Some Value"
        start_server {tags {"repl"}} {
            set second [srv 0 client]
            set second_host [srv 0 host]
            set second_port [srv 0 port]

            assert_match {*migrate_cached_sockets:0*} [r -1 info]
            r -1 migrate $second_host $second_port key 9 1000
            assert_match {*migrate_cached_sockets:1*} [r -1 info]
        }
    }

    test {MIGRATE cached connections are released after some time} {
        after 15000
        assert_match {*migrate_cached_sockets:0*} [r info]
    }

    test {MIGRATE is able to migrate a key between two instances} {
        set first [srv 0 client]
        r set key "Some Value"
        start_server {tags {"repl"}} {
            set second [srv 0 client]
            set second_host [srv 0 host]
            set second_port [srv 0 port]

            assert {[$first exists key] == 1}
            assert {[$second exists key] == 0}
            set ret [r -1 migrate $second_host $second_port key 9 5000]
            assert {$ret eq {OK}}
            assert {[$first exists key] == 0}
            assert {[$second exists key] == 1}
            assert {[$second get key] eq {Some Value}}
            assert {[$second ttl key] == -1}
        }
    }

    test {MIGRATE is able to copy a key between two instances} {
        set first [srv 0 client]
        r del list
        r lpush list a b c d
        start_server {tags {"repl"}} {
            set second [srv 0 client]
            set second_host [srv 0 host]
            set second_port [srv 0 port]

            assert {[$first exists list] == 1}
            assert {[$second exists list] == 0}
            set ret [r -1 migrate $second_host $second_port list 9 5000 copy]
            assert {$ret eq {OK}}
            assert {[$first exists list] == 1}
            assert {[$second exists list] == 1}
            assert {[$first lrange list 0 -1] eq [$second lrange list 0 -1]}
        }
    }

    test {MIGRATE will not overwrite existing keys, unless REPLACE is used} {
        set first [srv 0 client]
        r del list
        r lpush list a b c d
        start_server {tags {"repl"}} {
            set second [srv 0 client]
            set second_host [srv 0 host]
            set second_port [srv 0 port]

            assert {[$first exists list] == 1}
            assert {[$second exists list] == 0}
            $second set list somevalue
            catch {r -1 migrate $second_host $second_port list 9 5000 copy} e
            assert_match {ERR*} $e
            set res [r -1 migrate $second_host $second_port list 9 5000 copy replace]
            assert {$ret eq {OK}}
            assert {[$first exists list] == 1}
            assert {[$second exists list] == 1}
            assert {[$first lrange list 0 -1] eq [$second lrange list 0 -1]}
        }
    }

    test {MIGRATE propagates TTL correctly} {
        set first [srv 0 client]
        r set key "Some Value"
        start_server {tags {"repl"}} {
            set second [srv 0 client]
            set second_host [srv 0 host]
            set second_port [srv 0 port]

            assert {[$first exists key] == 1}
            assert {[$second exists key] == 0}
            $first expire key 10
            set ret [r -1 migrate $second_host $second_port key 9 5000]
            assert {$ret eq {OK}}
            assert {[$first exists key] == 0}
            assert {[$second exists key] == 1}
            assert {[$second get key] eq {Some Value}}
            assert {[$second ttl key] >= 7 && [$second ttl key] <= 10}
        }
    }

    test {MIGRATE can correctly transfer large values} {
        set first [srv 0 client]
        r del key
        for {set j 0} {$j < 40000} {incr j} {
            r rpush key 1 2 3 4 5 6 7 8 9 10
            r rpush key "item 1" "item 2" "item 3" "item 4" "item 5" \
                        "item 6" "item 7" "item 8" "item 9" "item 10"
        }
        assert {[string length [r dump key]] > (1024*64)}
        start_server {tags {"repl"}} {
            set second [srv 0 client]
            set second_host [srv 0 host]
            set second_port [srv 0 port]

            assert {[$first exists key] == 1}
            assert {[$second exists key] == 0}
            set ret [r -1 migrate $second_host $second_port key 9 10000]
            assert {$ret eq {OK}}
            assert {[$first exists key] == 0}
            assert {[$second exists key] == 1}
            assert {[$second ttl key] == -1}
            assert {[$second llen key] == 40000*20}
        }
    }

    test {MIGRATE can correctly transfer hashes} {
        set first [srv 0 client]
        r del key
        r hmset key field1 "item 1" field2 "item 2" field3 "item 3" \
                    field4 "item 4" field5 "item 5" field6 "item 6"
        start_server {tags {"repl"}} {
            set second [srv 0 client]
            set second_host [srv 0 host]
            set second_port [srv 0 port]

            assert {[$first exists key] == 1}
            assert {[$second exists key] == 0}
            set ret [r -1 migrate $second_host $second_port key 9 10000]
            assert {$ret eq {OK}}
            assert {[$first exists key] == 0}
            assert {[$second exists key] == 1}
            assert {[$second ttl key] == -1}
        }
    }

    test {MIGRATE timeout actually works} {
        set first [srv 0 client]
        r set key "Some Value"
        start_server {tags {"repl"}} {
            set second [srv 0 client]
            set second_host [srv 0 host]
            set second_port [srv 0 port]

            assert {[$first exists key] == 1}
            assert {[$second exists key] == 0}

            set rd [redis_deferring_client]
            $rd debug sleep 1.0 ; # Make second server unable to reply.
            set e {}
            catch {r -1 migrate $second_host $second_port key 9 500} e
            assert_match {IOERR*} $e
        }
    }

    test {MIGRATE can migrate multiple keys at once} {
        set first [srv 0 client]
        r set key1 "v1"
        r set key2 "v2"
        r set key3 "v3"
        start_server {tags {"repl"}} {
            set second [srv 0 client]
            set second_host [srv 0 host]
            set second_port [srv 0 port]

            assert {[$first exists key1] == 1}
            assert {[$second exists key1] == 0}
            set ret [r -1 migrate $second_host $second_port "" 9 5000 keys key1 key2 key3]
            assert {$ret eq {OK}}
            assert {[$first exists key1] == 0}
            assert {[$first exists key2] == 0}
            assert {[$first exists key3] == 0}
            assert {[$second get key1] eq {v1}}
            assert {[$second get key2] eq {v2}}
            assert {[$second get key3] eq {v3}}
        }
    }

    test {MIGRATE with multiple keys must have empty key arg} {
        catch {r MIGRATE 127.0.0.1 6379 NotEmpty 9 5000 keys a b c} e
        set e
    } {*empty string*}

    test {MIGRATE with mutliple keys migrate just existing ones} {
        set first [srv 0 client]
        r set key1 "v1"
        r set key2 "v2"
        r set key3 "v3"
        start_server {tags {"repl"}} {
            set second [srv 0 client]
            set second_host [srv 0 host]
            set second_port [srv 0 port]

            set ret [r -1 migrate $second_host $second_port "" 9 5000 keys nokey-1 nokey-2 nokey-2]
            assert {$ret eq {NOKEY}}

            assert {[$first exists key1] == 1}
            assert {[$second exists key1] == 0}
            set ret [r -1 migrate $second_host $second_port "" 9 5000 keys nokey-1 key1 nokey-2 key2 nokey-3 key3]
            assert {$ret eq {OK}}
            assert {[$first exists key1] == 0}
            assert {[$first exists key2] == 0}
            assert {[$first exists key3] == 0}
            assert {[$second get key1] eq {v1}}
            assert {[$second get key2] eq {v2}}
            assert {[$second get key3] eq {v3}}
        }
    }
}
