Backend: Rename PrismWorker to MetaWorker

Signed-off-by: Michael Mayer <michael@liquidbytes.net>

internal/workers/meta_test.go

@@ -0,0 +1,37 @@
+package workers
+
+import (
+	"testing"
+
+	"github.com/photoprism/photoprism/internal/config"
+	"github.com/photoprism/photoprism/internal/mutex"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPrism_Start(t *testing.T) {
+	conf := config.TestConfig()
+
+	t.Logf("database-dsn: %s", conf.DatabaseDsn())
+
+	worker := NewMeta(conf)
+
+	assert.IsType(t, &Meta{}, worker)
+
+	if err := mutex.MetaWorker.Start(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := worker.Start(); err == nil {
+		t.Fatal("error expected")
+	}
+
+	mutex.MetaWorker.Stop()
+
+	if err := worker.Start(); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := worker.Start(); err != nil {
+		t.Fatal(err)
+	}
+}