deno/cli/tests/unit/version_test.ts

import { assert, unitTest } from "./test_util.ts";

unitTest(function version(): void {
  const pattern = /^\d+\.\d+\.\d+/;
  assert(pattern.test(Deno.version.deno));
  assert(pattern.test(Deno.version.v8));
  // Unreleased version of TypeScript now set the version to 0-dev
  assert(
    pattern.test(Deno.version.typescript) ||
      Deno.version.typescript === "0-dev",
  );
});