1 files changed, 33 insertions, 0 deletions
diff --git a/src/cmd/go/help_test.go b/src/cmd/go/help_test.go
new file mode 100644
index 0000000..abfc3db
--- /dev/null
+++ b/src/cmd/go/help_test.go
@@ -0,0 +1,33 @@
+// Copyright 2018 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 main_test
+
+import (
+	"bytes"
+	"os"
+	"testing"
+
+	"cmd/go/internal/help"
+	"cmd/go/internal/modload"
+)
+
+func TestDocsUpToDate(t *testing.T) {
+	t.Parallel()
+
+	if !modload.Enabled() {
+		t.Skipf("help.Help in GOPATH mode is configured by main.main")
+	}
+
+	buf := new(bytes.Buffer)
+	// Match the command in mkalldocs.sh that generates alldocs.go.
+	help.Help(buf, []string{"documentation"})
+	data, err := os.ReadFile("alldocs.go")
+	if err != nil {
+		t.Fatalf("error reading alldocs.go: %v", err)
+	}
+	if !bytes.Equal(data, buf.Bytes()) {
+		t.Errorf("alldocs.go is not up to date; run mkalldocs.sh to regenerate it")
+	}
+}