Add unit & acceptance tests around db selection

acceptance-tests/acceptance.bats

@@ -11,6 +11,11 @@
   [ "$status" -eq 1 ]
 }
 
+@test "Pass when using a non-default db" {
+  run tests/select-db.sh
+  [ "$status" -eq 0 ]
+}
+
 # https://github.com/yannh/redis-dump-go/issues/11
 # https://github.com/yannh/redis-dump-go/issues/18
 @test "Pass when importing a ZSET with 1M entries" {

acceptance-tests/tests/select-db.sh

@@ -0,0 +1,26 @@
+#!/bin/sh -e
+
+export DB=2
+
+echo "-> Filling Redis with Mock Data..."
+redis-cli -h redis -n $DB FLUSHDB
+/generator -output resp -type strings -n 100 | redis-cli -h redis -n $DB --pipe
+DBSIZE=`redis-cli -h redis -n $DB dbsize`
+
+echo "-> Dumping DB..."
+time /redis-dump-go -host redis -n 250 -db $DB -output resp >backup
+
+echo "-> Flushing DB and restoring dump..."
+redis-cli -h redis -n $DB FLUSHDB
+redis-cli -h redis -n $DB --pipe <backup
+NEWDBSIZE=`redis-cli -h redis -n $DB dbsize`
+echo "Redis has $DBSIZE entries"
+
+echo "-> Comparing DB sizes..."
+if [ $DBSIZE -ne $NEWDBSIZE ]; then
+  echo "ERROR - restored DB has $NEWDBSIZE elements, expected $DBSIZE"
+  exit 1
+else
+  echo "OK - $NEWDBSIZE elements"
+  exit 0
+fi

pkg/config/config_test.go

@@ -23,6 +23,19 @@ func TestFromFlags(t *testing.T) {
 				Output:    "resp",
 			},
 		},
+		{
+			[]string{"-db", "2"},
+			Config{
+				Db:        2,
+				Host:      "127.0.0.1",
+				Port:      6379,
+				Filter:    "*",
+				BatchSize: 1000,
+				NWorkers:  10,
+				WithTTL:   true,
+				Output:    "resp",
+			},
+		},
 		{
 			[]string{"-ttl=false"},
 			Config{