minor code coverage

matrix/txnid.test.js

@@ -0,0 +1,12 @@
+// @ts-check
+
+const {test} = require("supertape")
+const txnid = require("./txnid")
+
+test("txnid: generates different values each run", t => {
+	const one = txnid.makeTxnId()
+	t.ok(one)
+	const two = txnid.makeTxnId()
+	t.ok(two)
+	t.notEqual(two, one)
+})