make it easy to run a specific redis version

Which we also use in Travis.

.gitignore

@@ -0,0 +1 @@
+/integration/redis_src/

.travis.yml

@@ -1,5 +1,8 @@
 language: go
 
+before_script:
+  - (cd ./integration && ./get_redis.sh)
+
 install: go get -t
 
 script: make test testrace int

README.md

@@ -315,7 +315,7 @@ Commands which will probably not be implemented:
 
 ## &c.
 
-Tests are run against Redis 4.0.6 (Debian). The [./integration](./integration/)
+Tests are run against Redis 5.0.3. The [./integration](./integration/)
 subdir compares miniredis against a real redis instance.
 
 

integration/ephemeral.go

@@ -7,12 +7,14 @@ package main
 import (
 	"fmt"
 	"net"
+	"os"
 	"os/exec"
 	"strconv"
 	"time"
 )
 
 const (
+	localSrc   = "./redis_src/"
 	executable = "redis-server"
 )
 
@@ -34,6 +36,9 @@ func RedisAuth(passwd string) (*ephemeral, string) {
 func runRedis(extraConfig string) (*ephemeral, string) {
 	port := arbitraryPort()
 
+	// we prefer the executable from ./redis_src, if any. See ./get_redis.sh
+	os.Setenv("PATH", fmt.Sprintf("%s:PATH", localSrc))
+
 	c := exec.Command(executable, "-")
 	stdin, err := c.StdinPipe()
 	if err != nil {

integration/get_redis.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+set -eu
+
+VERSION=5.0.3
+
+rm -rf ./redis_src/
+mkdir -p ./redis_src/
+cd ./redis_src/
+wget http://download.redis.io/releases/redis-${VERSION}.tar.gz -O ./redis.tar.gz
+tar -xf ./redis.tar.gz
+(cd ./redis-${VERSION}/src/ && make)
+cp ./redis-${VERSION}/src/redis-server .