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function assertDocumentIsReadyForSideEffectsTest(doc, description) {
assert_not_equals(doc.childNodes.length, 0, `document should not be empty before side effects test (${description})`);
}
function assertOpenHasNoSideEffects(doc, originalURL, description) {
assert_not_equals(doc.childNodes.length, 0, `document nodes should not be cleared (${description})`);
assert_equals(doc.URL, originalURL, `The original URL should be kept (${description})`);
}