An example of how to make an out of tree backend for rclone

backend/ram/ram_internal_test.go

@@ -0,0 +1,40 @@
+package ram
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	_ "github.com/rclone/rclone/backend/local"
+	"github.com/rclone/rclone/fs/operations"
+	"github.com/rclone/rclone/fstest"
+	"github.com/rclone/rclone/fstest/fstests"
+	"github.com/stretchr/testify/require"
+)
+
+var t1 = fstest.Time("2001-02-03T04:05:06.499999999Z")
+
+// InternalTest dispatches all internal tests
+func (f *Fs) InternalTest(t *testing.T) {
+	t.Run("PurgeListDeadlock", func(t *testing.T) {
+		testPurgeListDeadlock(t)
+	})
+}
+
+// test that Purge fallback does not result in deadlock from concurrently listing and removing
+func testPurgeListDeadlock(t *testing.T) {
+	ctx := context.Background()
+	r := fstest.NewRunIndividual(t)
+	r.Mkdir(ctx, r.Fremote)
+	r.Fremote.Features().Disable("Purge") // force fallback-purge
+
+	// make a lot of files to prevent it from finishing too quickly
+	for i := range 100 {
+		dst := "file" + fmt.Sprint(i) + ".txt"
+		r.WriteObject(ctx, dst, "hello", t1)
+	}
+
+	require.NoError(t, operations.Purge(ctx, r.Fremote, ""))
+}
+
+var _ fstests.InternalTester = (*Fs)(nil)