t.throws(undefined) passes, and should not

[dmitrizagidulin]

What am I doing wrong here? t.throws() doesn't seem to be working (not failing the test when a function is not throwing any exceptions).

Here's a sample test, that passes successfully (instead of failing as expected):

'use strict'

var test = require('tape')

function emptyFunction () {
  // nothing happens here
}

test('This test should fail', function (t) {
  t.plan(1)
  t.throws(emptyFunction())
})

I'm on Node 5.0, tape version 4.4.0.

[ljharb]

@dmitrizagidulin throws takes a single function - you're passing it undefined (the return value of a function)

[dmitrizagidulin]

Ohh I see. Is there a way to pass parameters to that function? (and why does it count undefined as a successful throws() test?)

[yoshuawuyts]

t.throws(myFunction.bind(null, 'arg1', 'arg2'))

t.throws(function () {
  myFunction('arg1', 'arg2')
})

[ljharb]

@dmitrizagidulin indeed that seems like a bug - assert.throws(undefined) throws with "block must be a function".

[dmitrizagidulin]

Thanks! :) Appreciate the guidance and the fix.

[ljharb]

np - I'll be releasing a patch version for v1, v2, v3, and v4 shortly that will include this fix.