diff --git a/benchmark/util/format.js b/benchmark/util/format.js
index 6f171318ee28bf..5f9c4c3b594497 100644
--- a/benchmark/util/format.js
+++ b/benchmark/util/format.js
@@ -21,6 +21,9 @@ const bench = common.createBenchmark(main, {
 });
 
 function main({ n, type }) {
+  // For testing, if supplied with an empty type, default to string.
+  type = type || 'string';
+
   const [first, second] = inputs[type];
 
   bench.start();
diff --git a/benchmark/util/inspect-array.js b/benchmark/util/inspect-array.js
index 751e2c3c2deb8f..74332d18579865 100644
--- a/benchmark/util/inspect-array.js
+++ b/benchmark/util/inspect-array.js
@@ -18,6 +18,9 @@ function main({ n, len, type }) {
   var arr = Array(len);
   var i, opts;
 
+  // For testing, if supplied with an empty type, default to denseArray.
+  type = type || 'denseArray';
+
   switch (type) {
     case 'denseArray_showHidden':
       opts = { showHidden: true };
diff --git a/benchmark/util/type-check.js b/benchmark/util/type-check.js
index c7e3de7de9fa09..b513c35a3caeb2 100644
--- a/benchmark/util/type-check.js
+++ b/benchmark/util/type-check.js
@@ -23,16 +23,19 @@ const bench = common.createBenchmark(main, {
   type: Object.keys(args),
   version: ['native', 'js'],
   argument: ['true', 'false-primitive', 'false-object'],
-  millions: ['5']
+  n: [5e6]
 }, {
   flags: ['--expose-internals']
 });
 
 function main(conf) {
+  // For testing, if supplied with an empty type, default to ArrayBufferView.
+  conf.type = conf.type || 'ArrayBufferView';
+
   const util = process.binding('util');
   const types = require('internal/util/types');
 
-  const n = (+conf.millions * 1e6) | 0;
+  const n = (+conf.n) | 0;
   const func = { native: util, js: types }[conf.version][`is${conf.type}`];
   const arg = args[conf.type][conf.argument];
 
diff --git a/test/parallel/test-benchmark-util.js b/test/parallel/test-benchmark-util.js
new file mode 100644
index 00000000000000..25140f8fe7ebc1
--- /dev/null
+++ b/test/parallel/test-benchmark-util.js
@@ -0,0 +1,14 @@
+'use strict';
+
+require('../common');
+
+const runBenchmark = require('../common/benchmark');
+
+runBenchmark('util',
+             ['argument=false',
+              'input=',
+              'method=Array',
+              'n=1',
+              'option=none',
+              'type=',
+              'version=native']);