Add Queue option to allow user to specify queue from client

Added base.QueueKey method to get redis key for given queue name.
Changed asynqtest.GetEnqueuedMessages to optionally take queue name.

internal/base/base.go

@@ -11,18 +11,26 @@ import (
 	"github.com/rs/xid"
 )
 
+// DefaultQueueName is the queue name used if none are specified by user.
+const DefaultQueueName = "default"
+
 // Redis keys
 const (
-	processedPrefix = "asynq:processed:"      // STRING - asynq:processed:<yyyy-mm-dd>
-	failurePrefix   = "asynq:failure:"        // STRING - asynq:failure:<yyyy-mm-dd>
-	QueuePrefix     = "asynq:queues:"         // LIST   - asynq:queues:<qname>
-	DefaultQueue    = QueuePrefix + "default" // LIST
-	ScheduledQueue  = "asynq:scheduled"       // ZSET
-	RetryQueue      = "asynq:retry"           // ZSET
-	DeadQueue       = "asynq:dead"            // ZSET
-	InProgressQueue = "asynq:in_progress"     // LIST
+	processedPrefix = "asynq:processed:"             // STRING - asynq:processed:<yyyy-mm-dd>
+	failurePrefix   = "asynq:failure:"               // STRING - asynq:failure:<yyyy-mm-dd>
+	queuePrefix     = "asynq:queues:"                // LIST   - asynq:queues:<qname>
+	DefaultQueue    = queuePrefix + DefaultQueueName // LIST
+	ScheduledQueue  = "asynq:scheduled"              // ZSET
+	RetryQueue      = "asynq:retry"                  // ZSET
+	DeadQueue       = "asynq:dead"                   // ZSET
+	InProgressQueue = "asynq:in_progress"            // LIST
 )
 
+// QueueKey returns a redis key string for the given queue name.
+func QueueKey(qname string) string {
+	return queuePrefix + qname
+}
+
 // ProcessedKey returns a redis key string for procesed count
 // for the given day.
 func ProcessedKey(t time.Time) string {

internal/base/base_test.go

@@ -9,6 +9,22 @@ import (
 	"time"
 )
 
+func TestQueueKey(t *testing.T) {
+	tests := []struct {
+		qname string
+		want  string
+	}{
+		{"custom", "asynq:queues:custom"},
+	}
+
+	for _, tc := range tests {
+		got := QueueKey(tc.qname)
+		if got != tc.want {
+			t.Errorf("QueueKey(%q) = %q, want %q", tc.qname, got, tc.want)
+		}
+	}
+}
+
 func TestProcessedKey(t *testing.T) {
 	tests := []struct {
 		input time.Time