data: split node and snapshot code from restic package

internal/data/snapshot_group_test.go

@@ -0,0 +1,50 @@
+package data_test
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/restic/restic/internal/data"
+	"github.com/restic/restic/internal/test"
+)
+
+func TestGroupByOptions(t *testing.T) {
+	for _, exp := range []struct {
+		from       string
+		opts       data.SnapshotGroupByOptions
+		normalized string
+	}{
+		{
+			from:       "",
+			opts:       data.SnapshotGroupByOptions{},
+			normalized: "",
+		},
+		{
+			from:       "host,paths",
+			opts:       data.SnapshotGroupByOptions{Host: true, Path: true},
+			normalized: "host,paths",
+		},
+		{
+			from:       "host,path,tag",
+			opts:       data.SnapshotGroupByOptions{Host: true, Path: true, Tag: true},
+			normalized: "host,paths,tags",
+		},
+		{
+			from:       "hosts,paths,tags",
+			opts:       data.SnapshotGroupByOptions{Host: true, Path: true, Tag: true},
+			normalized: "host,paths,tags",
+		},
+	} {
+		var opts data.SnapshotGroupByOptions
+		test.OK(t, opts.Set(exp.from))
+		if !cmp.Equal(opts, exp.opts) {
+			t.Errorf("unexpected opts %s", cmp.Diff(opts, exp.opts))
+		}
+		test.Equals(t, opts.String(), exp.normalized)
+	}
+
+	var opts data.SnapshotGroupByOptions
+	err := opts.Set("tags,invalid")
+	test.Assert(t, err != nil, "missing error on invalid tags")
+	test.Assert(t, !opts.Host && !opts.Path && !opts.Tag, "unexpected opts %s %s %s", opts.Host, opts.Path, opts.Tag)
+}