# Miniredis

Pure Go Redis test server, used in Go unittests.


##

Sometimes you want to test code which uses Redis, without making it a full-blown
integration test.
Miniredis implements (parts of) the Redis server, to be used in unittests. It
enables a simple, cheap, in-memory, Redis replacement, with a real TCP interface. Think of it as the Redis version of `net/http/httptest`.

It saves you from using mock code, and since the redis server lives in the
test process you can query for values directly, without going through the server
stack.

There are no dependencies on external binaries, so you can easily integrate it in automated build processes.

## 1.0.0 incompatiliby notice

2.0.0 improves TTLs to be `time.Duration` values. `.Expire()` is removed and
replaced by `.TTL()`, which returns the TTL as a `time.Duration`.
This should be the change needed to upgrade:

1.0.0:

    m.Expire() == 4
   
2.0.0:

    m.TTL() == 4 * time.Second

Furthermore, `.SetTime()` is added to help with `EXPIREAT` commands, and `.FastForward()` is introduced to test keys expiration.


## Commands

Implemented commands:

 - Connection (complete)
   - AUTH -- see RequireAuth()
   - ECHO
   - PING
   - SELECT
   - QUIT
 - Key 
   - DEL
   - EXISTS
   - EXPIRE
   - EXPIREAT
   - KEYS
   - MOVE
   - PERSIST
   - PEXPIRE
   - PEXPIREAT
   - PTTL
   - RENAME
   - RENAMENX
   - RANDOMKEY -- call math.rand.Seed(...) once before using.
   - TTL
   - TYPE
   - SCAN
 - Transactions (complete)
   - DISCARD
   - EXEC
   - MULTI
   - UNWATCH
   - WATCH
 - Server
   - DBSIZE
   - FLUSHALL
   - FLUSHDB
 - String keys (complete)
   - APPEND
   - BITCOUNT
   - BITOP
   - BITPOS
   - DECR
   - DECRBY
   - GET
   - GETBIT
   - GETRANGE
   - GETSET
   - INCR
   - INCRBY
   - INCRBYFLOAT
   - MGET
   - MSET
   - MSETNX
   - PSETEX
   - SET
   - SETBIT
   - SETEX
   - SETNX
   - SETRANGE
   - STRLEN
 - Hash keys (complete)
   - HDEL
   - HEXISTS
   - HGET
   - HGETALL
   - HINCRBY
   - HINCRBYFLOAT
   - HKEYS
   - HLEN
   - HMGET
   - HMSET
   - HSET
   - HSETNX
   - HVALS
   - HSCAN
 - List keys (complete)
   - BLPOP
   - BRPOP
   - BRPOPLPUSH
   - LINDEX
   - LINSERT
   - LLEN
   - LPOP
   - LPUSH
   - LPUSHX
   - LRANGE
   - LREM
   - LSET
   - LTRIM
   - RPOP
   - RPOPLPUSH
   - RPUSH
   - RPUSHX
 - Set keys (complete)
   - SADD
   - SCARD
   - SDIFF
   - SDIFFSTORE
   - SINTER
   - SINTERSTORE
   - SISMEMBER
   - SMEMBERS
   - SMOVE
   - SPOP -- call math.rand.Seed(...) once before using.
   - SRANDMEMBER -- call math.rand.Seed(...) once before using.
   - SREM
   - SUNION
   - SUNIONSTORE
   - SSCAN
 - Sorted Set keys (complete)
   - ZADD
   - ZCARD
   - ZCOUNT
   - ZINCRBY
   - ZINTERSTORE
   - ZLEXCOUNT
   - ZRANGE
   - ZRANGEBYLEX
   - ZRANGEBYSCORE
   - ZRANK
   - ZREM
   - ZREMRANGEBYLEX
   - ZREMRANGEBYRANK
   - ZREMRANGEBYSCORE
   - ZREVRANGE
   - ZREVRANGEBYSCORE
   - ZREVRANK
   - ZSCORE
   - ZUNIONSTORE
   - ZSCAN


Since miniredis is intended to be used in unittests TTLs don't decrease
automatically. You can use `TTL()` to get the TTL (as a time.Duration) of a
key. It will return 0 when no TTL is set. EXPIREAT and PEXPIREAT values will be
converted to a duration. For that you can either set m.SetTime(t) to use that
time as the base for the (P)EXPIREAT conversion, or don't call SetTime(), in
which case time.Now() will be used.
`m.FastForward(d)` can be used to decrement all TTLs. All TTLs which become <=
0 will be removed.

## Example

``` Go
func TestSomething(t *testing.T) {
	s, err := miniredis.Run()
	if err != nil {
		panic(err)
	}
	defer s.Close()

	// Optionally set some keys your code expects:
	s.Set("foo", "bar")
	s.HSet("some", "other", "key")

	// Run your code and see if it behaves.
	// An example using the redigo library from "github.com/garyburd/redigo/redis":
	c, err := redis.Dial("tcp", s.Addr())
	_, err = c.Do("SET", "foo", "bar")

	// Optionally check values in redis...
	if got, err := s.Get("foo"); err != nil || got != "bar" {
        t.Error("'foo' has the wrong value")
    }
    // ... or use a helper for that:
    s.CheckGet(t, "foo", "bar")

    // TTL and expiration:
    s.Set("foo", "bar")
    s.SetTTL("foo", 10 * time.Second)
    s.FastForward(11 * time.Second)
    if s.Exists("foo") {
        t.Fatal("'foo' should not have existed anymore")
    }
}
```

## Not supported

Commands which will probably not be implemented:

 - CLUSTER (all)
    - ~~CLUSTER *~~
    - ~~READONLY~~
    - ~~READWRITE~~
 - GEO (all) -- unless someone needs these
    - ~~GEOADD~~
    - ~~GEODIST~~
    - ~~GEOHASH~~
    - ~~GEOPOS~~
    - ~~GEORADIUS~~
    - ~~GEORADIUSBYMEMBER~~
 - HyperLogLog (all) -- unless someone needs these
    - ~~PFADD~~
    - ~~PFCOUNT~~
    - ~~PFMERGE~~
 - Key
    - ~~DUMP~~
    - ~~MIGRATE~~
    - ~~OBJECT~~
    - ~~RESTORE~~
    - ~~WAIT~~
 - Pub/Sub (all)
    - ~~PSUBSCRIBE~~
    - ~~PUBLISH~~
    - ~~PUBSUB~~
    - ~~PUNSUBSCRIBE~~
    - ~~SUBSCRIBE~~
    - ~~UNSUBSCRIBE~~
 - Scripting (all)
    - ~~EVAL~~
    - ~~EVALSHA~~
    - ~~SCRIPT *~~
 - Server
    - ~~BGSAVE~~
    - ~~BGWRITEAOF~~
    - ~~CLIENT *~~
    - ~~COMMAND *~~
    - ~~CONFIG *~~
    - ~~DEBUG *~~
    - ~~INFO~~
    - ~~LASTSAVE~~
    - ~~MONITOR~~
    - ~~ROLE~~
    - ~~SAVE~~
    - ~~SHUTDOWN~~
    - ~~SLAVEOF~~
    - ~~SLOWLOG~~
    - ~~SYNC~~
    - ~~TIME~~
    

## &c.

See https://github.com/alicebob/miniredis_vs_redis for tests comparing
miniredis against the real thing. Tests are run against Redis 3.2.5 (Debian).


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