diff --git a/internal/export/unicode/unicode_test.go b/internal/export/unicode/unicode_test.go
new file mode 100644
index 0000000..ce7ae2e
--- /dev/null
+++ b/internal/export/unicode/unicode_test.go
@@ -0,0 +1,28 @@
+// Copyright 2019 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 unicode
+
+import (
+	"testing"
+	"unicode"
+
+	"golang.org/x/text/internal/gen"
+	"golang.org/x/text/internal/testtext"
+	"golang.org/x/text/internal/ucd"
+)
+
+// TestScripts tests for all runes whether they are included in the correct
+// script and, indirectly, whether each script exists.
+func TestScripts(t *testing.T) {
+	testtext.SkipIfNotLong(t)
+
+	ucd.Parse(gen.OpenUCDFile("Scripts.txt"), func(p *ucd.Parser) {
+		r := p.Rune(0)
+		script := p.String(1)
+		if !unicode.Is(unicode.Scripts[script], r) {
+			t.Errorf("%U: not in script %q", r, script)
+		}
+	})
+}