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Please describe the minimum necessary steps to reproduce this issue:

const mm = require('micromatch');
const files = ['yoooo.js','foo/baz/something.js', 'bar/baz/something.js', 'anything-else/foo.js', 'anything/__tests__/else.js'];
mm(files, '!(bar/baz|foo|**/__tests_)/**/*.js')

What is happening that shouldn't be?

[ 'foo/baz/something.js',
  'bar/baz/something.js',
  'anything-else/foo.js',
  'anything/__tests__/else.js' ]

all the files match. this is with 4.0.2

What should be happening instead?

[ 'anything-else/foo.js' ]

this worked correctly in 3.x