1 files changed, 28 insertions, 0 deletions
diff --git a/gopls/internal/lsp/source/completion/util_test.go b/gopls/internal/lsp/source/completion/util_test.go
new file mode 100644
index 000000000..c94d279fb
--- /dev/null
+++ b/gopls/internal/lsp/source/completion/util_test.go
@@ -0,0 +1,28 @@
+// Copyright 2020 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.
+
+package completion
+
+import (
+	"go/types"
+	"testing"
+)
+
+func TestFormatZeroValue(t *testing.T) {
+	tests := []struct {
+		typ  types.Type
+		want string
+	}{
+		{types.Typ[types.String], `""`},
+		{types.Typ[types.Byte], "0"},
+		{types.Typ[types.Invalid], ""},
+		{types.Universe.Lookup("error").Type(), "nil"},
+	}
+
+	for _, test := range tests {
+		if got := formatZeroValue(test.typ, nil); got != test.want {
+			t.Errorf("formatZeroValue(%v) = %q, want %q", test.typ, got, test.want)
+		}
+	}
+}