| 1 | // fixtures/dom-stub.mjs — the smallest DOM the tests need, and only |
| 2 | // the tests: nothing in the bundle imports it (build-bundles.mjs walks |
| 3 | // from editor-entry.js, which does not). |
| 4 | // |
| 5 | // It exists because two of the rules this project cares about are DOM |
| 6 | // rules and neither can be checked without one: that the Blocks list |
| 7 | // keeps the SAME button elements across a fill (so focus survives a |
| 8 | // colleague's keystroke), and that a mount's listeners are actually |
| 9 | // gone after destroy() (so a resync does not leave a second copy of |
| 10 | // every handler on the page's own elements). Both are about node |
| 11 | // identity and listener count, which is exactly what a stub can answer |
| 12 | // and what a headless browser answers slowly. |
| 13 | // |
| 14 | // It is not a DOM. Selectors are matched by attribute presence only — |
| 15 | // `[data-select-block]`, `[slides-blocks-buttons]` — because that is |
| 16 | // all the code under test asks for. |
| 17 | |
| 18 | class StubElement { |
| 19 | constructor (tag = 'div') { |
| 20 | this.tagName = tag.toUpperCase() |
| 21 | this.attrs = new Map() |
| 22 | this.children = [] |
| 23 | this.parentNode = null |
| 24 | this.dataset = {} |
| 25 | this.listeners = [] |
| 26 | this.text = '' |
| 27 | this.hidden = false |
| 28 | this.type = '' |
| 29 | } |
| 30 | |
| 31 | get textContent () { |
| 32 | if (this.children.length) return this.children.map(c => c.textContent).join('') |
| 33 | return this.text |
| 34 | } |
| 35 | |
| 36 | set textContent (v) { |
| 37 | // The real thing replaces every child with one text node — which |
| 38 | // is why the code under test avoids writing it when it need not. |
| 39 | this.children = [] |
| 40 | this.text = String(v) |
| 41 | } |
| 42 | |
| 43 | setAttribute (name, value) { this.attrs.set(name, String(value)) } |
| 44 | getAttribute (name) { return this.attrs.has(name) ? this.attrs.get(name) : null } |
| 45 | hasAttribute (name) { return this.attrs.has(name) } |
| 46 | removeAttribute (name) { this.attrs.delete(name) } |
| 47 | |
| 48 | get firstElementChild () { return this.children[0] || null } |
| 49 | get nextElementSibling () { |
| 50 | if (!this.parentNode) return null |
| 51 | const at = this.parentNode.children.indexOf(this) |
| 52 | return this.parentNode.children[at + 1] || null |
| 53 | } |
| 54 | |
| 55 | append (...nodes) { |
| 56 | for (const n of nodes) { |
| 57 | n.remove() |
| 58 | n.parentNode = this |
| 59 | this.children.push(n) |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | insertBefore (node, ref) { |
| 64 | node.remove() |
| 65 | node.parentNode = this |
| 66 | const at = ref ? this.children.indexOf(ref) : -1 |
| 67 | if (at < 0) this.children.push(node) |
| 68 | else this.children.splice(at, 0, node) |
| 69 | return node |
| 70 | } |
| 71 | |
| 72 | remove () { |
| 73 | if (!this.parentNode) return |
| 74 | // A browser blurs the focused element when it (or an ancestor) |
| 75 | // leaves the tree — which is what moving a node does, and what |
| 76 | // strip.mjs's sync has to put right afterwards. |
| 77 | const doc = globalThis.document |
| 78 | if (doc && doc.activeElement && this.contains(doc.activeElement)) doc.activeElement = null |
| 79 | const at = this.parentNode.children.indexOf(this) |
| 80 | if (at >= 0) this.parentNode.children.splice(at, 1) |
| 81 | this.parentNode = null |
| 82 | } |
| 83 | |
| 84 | focus () { |
| 85 | if (globalThis.document) globalThis.document.activeElement = this |
| 86 | } |
| 87 | |
| 88 | matches (selector) { |
| 89 | const name = selector.replace(/^\[|\]$/g, '') |
| 90 | if (name.startsWith('data-')) { |
| 91 | const key = name.slice(5).replace(/-([a-z])/g, (m, c) => c.toUpperCase()) |
| 92 | return this.dataset[key] !== undefined |
| 93 | } |
| 94 | return this.attrs.has(name) |
| 95 | } |
| 96 | |
| 97 | descendants () { |
| 98 | return this.children.flatMap(c => [c, ...c.descendants()]) |
| 99 | } |
| 100 | |
| 101 | querySelectorAll (selector) { |
| 102 | return this.descendants().filter(el => el.matches(selector)) |
| 103 | } |
| 104 | |
| 105 | querySelector (selector) { |
| 106 | return this.querySelectorAll(selector)[0] || null |
| 107 | } |
| 108 | |
| 109 | contains (el) { |
| 110 | return el === this || this.descendants().includes(el) |
| 111 | } |
| 112 | |
| 113 | closest (selector) { |
| 114 | for (let el = this; el; el = el.parentNode) if (el.matches(selector)) return el |
| 115 | return null |
| 116 | } |
| 117 | |
| 118 | // The whole point of the listener half: {signal} has to work, or a |
| 119 | // destroy() built on AbortController would test as passing while |
| 120 | // leaving every handler in place. |
| 121 | addEventListener (type, fn, opts = {}) { |
| 122 | const entry = { type, fn } |
| 123 | this.listeners.push(entry) |
| 124 | if (opts && opts.signal) { |
| 125 | opts.signal.addEventListener('abort', () => { |
| 126 | const at = this.listeners.indexOf(entry) |
| 127 | if (at >= 0) this.listeners.splice(at, 1) |
| 128 | }) |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | removeEventListener (type, fn) { |
| 133 | const at = this.listeners.findIndex(l => l.type === type && l.fn === fn) |
| 134 | if (at >= 0) this.listeners.splice(at, 1) |
| 135 | } |
| 136 | |
| 137 | countListeners (type) { |
| 138 | return this.listeners.filter(l => l.type === type).length |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | /** A stub element, optionally with attributes and children. */ |
| 143 | export function el (tag = 'div', attrs = {}, children = []) { |
| 144 | const node = new StubElement(tag) |
| 145 | for (const [k, v] of Object.entries(attrs)) { |
| 146 | if (k.startsWith('data-')) node.dataset[k.slice(5).replace(/-([a-z])/g, (m, c) => c.toUpperCase())] = String(v) |
| 147 | node.setAttribute(k, v) |
| 148 | } |
| 149 | node.append(...children) |
| 150 | return node |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * Installs a stub `document` on globalThis for the duration of a test |
| 155 | * and returns it plus the undo. Only what the modules under test reach |
| 156 | * for: createElement, and activeElement (nothing focused). |
| 157 | */ |
| 158 | export function withDocument () { |
| 159 | const before = globalThis.document |
| 160 | const doc = el('html') |
| 161 | doc.createElement = tag => new StubElement(tag) |
| 162 | doc.activeElement = null |
| 163 | globalThis.document = doc |
| 164 | return { document: doc, restore () { globalThis.document = before } } |
| 165 | } |
| 166 | |
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