});

If the value of `expectFailure` is a {RegExp|Function|Object|Error}

the tests will pass only if they throw a matching value.

See [`assert.throws`][] for how each value type is handled.

**Default:** `false`.

* `expectFailure` {boolean|string|RegExp|Function|Object|Error} If truthy, the

test is expected to fail. If a non-empty string is provided, that string is displayed

in the test results as the reason why the test is expected to fail. If a {RegExp|Function|Object|Error}

is provided directly (without wrapping in `{ match: … }`), the test passes

only if the thrown error matches, following the behavior of

[`assert.throws`][]. To provide both a reason and validation, pass an object