1 files changed, 18 insertions, 0 deletions
diff --git a/src/cmd/internal/sys/supported_test.go b/src/cmd/internal/sys/supported_test.go
new file mode 100644
index 0000000000..1217814af5
--- /dev/null
+++ b/src/cmd/internal/sys/supported_test.go
@@ -0,0 +1,18 @@
+// 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 sys
+
+import (
+	"internal/testenv"
+	"runtime"
+	"testing"
+)
+
+func TestMustLinkExternalMatchesTestenv(t *testing.T) {
+	// MustLinkExternal and testenv.CanInternalLink are the exact opposite.
+	if b := MustLinkExternal(runtime.GOOS, runtime.GOARCH); b != !testenv.CanInternalLink() {
+		t.Fatalf("MustLinkExternal() == %v, testenv.CanInternalLink() == %v, don't match", b, testenv.CanInternalLink())
+	}
+}