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eoghanmurrayeoghanmurray
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Reliably generate mutations while the snapshot is iterating in order to test rare occurrences. Have added what I believe should be the correct parsing
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‎src/snapshot.ts‎

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@@ -724,6 +724,13 @@ export function serializeNodeWithId(
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serializedNode.type === NodeType.Element) &&
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recordChild
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) {
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// MUTATION TEST
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if ((n as HTMLElement).dataset &&
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(n as HTMLElement).dataset.mutatefn &&
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typeof (n as HTMLElement).dataset.mutatefn === 'string') {
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eval((n as HTMLElement).dataset.mutatefn || '');
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}
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// END MUTATION TEST (this block should be removed by compiler!)
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if (
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slimDOMOptions.headWhitespace &&
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_serializedNode.type === NodeType.Element &&

‎test/__snapshots__/integration.ts.snap‎

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@@ -130,7 +130,7 @@ exports[`[html file]: form-fields.html 1`] = `
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<input name=\\"tagName\\" />
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</label>
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</form>
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<noscript>SCRIPT_PLACEHOLDER</noscript></body></html>"
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`;
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@@ -217,6 +217,52 @@ exports[`[html file]: mask-text.html 1`] = `
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</body></html>"
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`;
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exports[`[html file]: mutating.html 1`] = `
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"<!DOCTYPE html><html xmlns=\\"http://www.w3.org/1999/xhtml\\" lang=\\"en\\"><head>
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<meta charset=\\"UTF-8\\" />
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<meta name=\\"viewport\\" content=\\"width=device-width, initial-scale=1.0\\" />
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<meta http-equiv=\\"X-UA-Compatible\\" content=\\"ie=edge\\" />
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<title>Document</title> <noscript>SCRIPT_PLACEHOLDER</noscript></head><body>
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<div data-mutatefn=\\"swapChildren()\\">
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<!-- does see in sequence; 1, then 2 -->
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<b id=\\"a1\\"></b><b id=\\"a2\\"></b>
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</div>
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<div>
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<!-- should see in sequence but doesn't -->
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<b data-mutatefn=\\"swapForwardSiblings()\\"></b>
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<b id=\\"b1\\"></b><b id=\\"b2\\"></b>
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</div>
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<div>
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<b id=\\"d1\\"></b>
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<b data-mutatefn=\\"moveForwardSiblingBehind()\\" id=\\"d2\\"></b>
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<!-- d3 shouldn't be visible -->
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</div>
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<div data-mutatefn=\\"swapInLongDistance()\\">
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<!-- a1 shouldn't be here as it's already in tree -->
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<b id=\\"e2\\"></b>
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</div></body></html>"
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`;
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exports[`[html file]: mutating.html~ 1`] = `
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"<!DOCTYPE html><html xmlns=\\"http://www.w3.org/1999/xhtml\\" lang=\\"en\\"><head>
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<meta charset=\\"UTF-8\\" />
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<meta name=\\"viewport\\" content=\\"width=device-width, initial-scale=1.0\\" />
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<meta http-equiv=\\"X-UA-Compatible\\" content=\\"ie=edge\\" />
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<title>Document</title> <noscript>SCRIPT_PLACEHOLDER</noscript></head><body>
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<div>
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<b data-mutate=\\"swap1\\" id=\\"a1\\"></b>
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<b id=\\"a2\\"></b>
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<b id=\\"a3\\"></b>
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</div>
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<div>
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<b id=\\"b1\\"></b>
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<b data-mutate=\\"swap2\\" id=\\"b2\\"></b>
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<b id=\\"b3\\"></b>
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</div></body></html>"
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`;
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exports[`[html file]: picture.html 1`] = `
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"<html xmlns=\\"http://www.w3.org/1999/xhtml\\"><head></head><body>
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<picture>

‎test/html/mutating.html‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,59 @@
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="X-UA-Compatible" content="ie=edge">
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<title>Document</title>
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<script>
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function swapChildren() {
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var a1 = document.getElementById('a1');
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var a2 = document.getElementById('a2');
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a1.parentNode.insertBefore(a1, a2);
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}
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function swapForwardSiblings() {
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var b2 = document.getElementById('b2');
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var b1 = document.getElementById('b1');
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b2.parentNode.insertBefore(b1, b2);
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}
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function moveForwardSiblingBehind() {
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var d1 = document.getElementById('d1');
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var d3 = document.getElementById('d3');
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d1.parentNode.insertBefore(d3, d1);
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}
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function swapInLongDistance() {
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var a1 = document.getElementById('a1');
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var e2 = document.getElementById('e2');
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e2.parentNode.insertBefore(a1, e2);
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}
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</script>
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</head>
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<body>
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<div data-mutatefn="swapChildren()">
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<!-- does see in sequence; 1, then 2 -->
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<b id="a2"></b>
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<b id="a1"></b>
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</div>
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<div>
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<!-- should see in sequence but doesn't -->
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<b data-mutatefn="swapForwardSiblings()"></b>
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<b id="b2"></b>
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<b id="b1"></b>
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</div>
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<div>
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<b id="d1"></b>
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<b data-mutatefn="moveForwardSiblingBehind()" id="d2"></b>
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<!-- d3 shouldn't be visible -->
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<b id="d3"></b>
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</div>
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<div data-mutatefn="swapInLongDistance()">
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<!-- a1 shouldn't be here as it's already in tree -->
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<b id="e2"></b>
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</div>
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</body>
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</html>

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