1 files changed, 52 insertions, 0 deletions
diff --git a/gopls/internal/vulncheck/vulntest/report_test.go b/gopls/internal/vulncheck/vulntest/report_test.go
new file mode 100644
index 000000000..c42dae805
--- /dev/null
+++ b/gopls/internal/vulncheck/vulntest/report_test.go
@@ -0,0 +1,52 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build go1.18
+// +build go1.18
+
+package vulntest
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func readAll(t *testing.T, filename string) io.Reader {
+	d, err := ioutil.ReadFile(filename)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return bytes.NewReader(d)
+}
+
+func TestRoundTrip(t *testing.T) {
+	// A report shouldn't change after being read and then written.
+	in := filepath.Join("testdata", "report.yaml")
+	r, err := readReport(readAll(t, in))
+	if err != nil {
+		t.Fatal(err)
+	}
+	out := filepath.Join(t.TempDir(), "report.yaml")
+	if err := r.Write(out); err != nil {
+		t.Fatal(err)
+	}
+
+	want, err := os.ReadFile(in)
+	if err != nil {
+		t.Fatal(err)
+	}
+	got, err := os.ReadFile(out)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if diff := cmp.Diff(want, got); diff != "" {
+		t.Errorf("mismatch (-want, +got):\n%s", diff)
+	}
+}