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Move tests to test.js 
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‎package.json

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},
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"scripts": {
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"format": "prettier --write \"**/*.js\" && xo --fix",
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"test": "tape test/*.js"
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"test": "node test"
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},
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"prettier": {
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"tabWidth": 2,

‎test.js

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'use strict'
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var test = require('tape')
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var u = require('unist-builder')
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var select = require('unist-util-select')
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var Index = require('.')
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test('index.add', function(t) {
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var ast = u('root', [u('node', {word: 'foo'}), u('node', {word: 'bar'})])
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var extraNode = u('node', {word: 'foo'})
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var $ = select.one(ast)
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var index = new Index(ast, 'word')
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t.deepEqual(index.get('foo'), [$('[word=foo]')])
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var result = index.add(extraNode)
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t.deepEqual(index.get('foo'), [$('[word=foo]'), extraNode])
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t.equal(result, index, 'returns this')
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index.add($('[word=foo]'))
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t.deepEqual(index.get('foo'), [$('[word=foo]'), extraNode])
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index.add(extraNode)
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t.deepEqual(index.get('foo'), [$('[word=foo]'), extraNode])
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t.end()
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})
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test('index.get', function(t) {
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t.test('get', function(st) {
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var ast = u('node', {color: 'black', id: 0}, [
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u('node', {color: 'black', id: 1}, [
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u('node', {color: 'red', id: 2}, [
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u('node', {color: 'black', id: 3}),
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u('node', {color: 'black', id: 4})
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]),
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u('node', {color: 'black', id: 5})
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]),
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u('node', {color: 'red', id: 6}, [
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u('node', {color: 'black', id: 7}, [
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u('node', {color: 'black', id: 8}),
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u('node', {color: 'black', id: 9})
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]),
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u('node', {color: 'black', id: 10}, [
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u('node', {color: 'red', id: 11}, [
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u('node', {color: 'black', id: 12}),
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u('node', {color: 'black', id: 13})
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]),
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u('node', {color: 'black', id: 14})
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])
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])
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])
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var $ = select.one(ast)
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var index = new Index(ast, 'color')
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st.deepEqual(index.get('black'), [
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$('[id=0]'),
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$('[id=1]'),
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$('[id=3]'),
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$('[id=4]'),
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$('[id=5]'),
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$('[id=7]'),
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$('[id=8]'),
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$('[id=9]'),
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$('[id=10]'),
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$('[id=12]'),
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$('[id=13]'),
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$('[id=14]')
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])
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st.deepEqual(index.get('red'), [$('[id=2]'), $('[id=6]'), $('[id=11]')])
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st.deepEqual(index.get('yellow'), [])
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st.end()
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})
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t.test('degenerate keys', function(st) {
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st.test('Object.prototype keys', function(sst) {
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var ast = u('node', {word: '__proto__', id: 0}, [
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u('node', {word: 'constructor', id: 1}),
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u('node', {word: 'toString', id: 2})
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])
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var $$ = select(ast)
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var index = new Index(ast, 'word')
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sst.deepEqual(index.get('__proto__'), $$('[id=0]'))
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sst.deepEqual(index.get('constructor'), $$('[id=1]'))
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sst.deepEqual(index.get('toString'), $$('[id=2]'))
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sst.end()
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})
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st.test('identity keys', function(sst) {
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var id1 = {foo: 'bar'}
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var id2 = {foo: 'bar'}
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var ast = u('root', [
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u('node', {word: false, id: 0}),
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u('node', {word: 'false', id: 1}),
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u('node', {word: 1, id: 2}),
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u('node', {word: '1', id: 3}),
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u('node', {word: id1, id: 4}),
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u('node', {word: id2, id: 5})
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])
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var $$ = select(ast)
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var index = new Index(ast, 'word')
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sst.deepEqual(index.get(false), $$('[id=0]'))
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sst.deepEqual(index.get('false'), $$('[id=1]'))
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sst.deepEqual(index.get(1), $$('[id=2]'))
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sst.deepEqual(index.get('1'), $$('[id=3]'))
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sst.deepEqual(index.get(id1), $$('[id=4]'))
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sst.deepEqual(index.get(id2), $$('[id=5]'))
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sst.deepEqual(index.get({foo: 'bar'}), [])
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sst.end()
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})
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st.end()
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})
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t.test('empty index', function(st) {
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st.deepEqual(new Index(null, 'foo').get('bar'), [])
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st.deepEqual(new Index('foo').get('bar'), [])
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st.end()
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})
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t.test('Index filter', function(st) {
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var ast = u('root', [
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u('node', {word: 'foo'}),
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u('node', {word: 'bar'}),
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u('skip', {word: 'foo'}),
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u('skip', {word: 'bar'})
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])
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var $$ = select(ast)
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st.test('type test', function(sst) {
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var index = new Index(ast, 'node', 'word')
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sst.deepEqual(index.get('foo'), $$('node[word="foo"]'))
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sst.deepEqual(index.get('bar'), $$('node[word="bar"]'))
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sst.end()
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})
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st.test('function test', function(sst) {
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var index = new Index(ast, filter, 'word')
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sst.deepEqual(index.get('foo'), $$('node[word="foo"]'))
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sst.deepEqual(index.get('bar'), $$('node[word="bar"]'))
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sst.end()
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function filter(node, index, parent) {
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return 'word' in node && index < 2 && parent.type === 'root'
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}
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})
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st.end()
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})
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t.test('computed keys', function(st) {
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var ast = u('root', {x: 0, y: 4, id: 0}, [
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u('node', {x: 3, y: 2, id: 1}),
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u('node', {x: 2, y: 2, id: 2}),
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u('node', {x: 3, y: 1, id: 3}),
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u('node', {x: 4, y: 1, id: 4})
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])
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var $ = select.one(ast)
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var index
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index = new Index(ast, xPlusY)
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st.deepEqual(index.get(4), [$('[id=0]'), $('[id=2]'), $('[id=3]')])
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st.deepEqual(index.get(0), [])
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st.deepEqual(index.get(5), [$('[id=1]'), $('[id=4]')])
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st.deepEqual(new Index(ast, 'node', xPlusY).get(4), [
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$('[id=2]'),
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$('[id=3]')
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])
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st.end()
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function xPlusY(node) {
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return node.x + node.y
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}
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})
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t.end()
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})
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test('index.remove', function(t) {
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var ast = u('root', [
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u('bad', {word: 'foo'}),
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u('node', {word: 'foo'}),
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u('node', {word: 'bar'})
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])
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var $ = select.one(ast)
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var index = new Index(ast, 'word')
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t.deepEqual(index.get('foo'), [$('bad[word=foo]'), $('node[word=foo]')])
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var result = index.remove($('bad'))
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t.deepEqual(index.get('foo'), [$('node[word=foo]')])
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t.equal(result, index, 'returns this')
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index.remove($('bad'))
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t.deepEqual(index.get('foo'), [$('node[word=foo]')])
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index.remove(u('terrible', {word: 'baz'}))
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t.deepEqual(index.get('foo'), [$('node[word=foo]')])
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index.remove($('node[word=foo]'))
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t.deepEqual(index.get('foo'), [])
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t.end()
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})

‎test/add.js

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