Function checkNodeContent

src/material/tree/tree.spec.ts:809–817

(node: Element, expectedNode: NodeContent)

function expectNestedTreeToMatch(treeElement: Element, ...expectedTree: TreeContent) {
  const missedExpectations: string[] = [];
  function checkNodeContent(node: Element, expectedNode: NodeContent) {
    const expectedTextContent = expectedNode[expectedNode.length - 1];
    const actualTextContent = node.childNodes.item(0).textContent!.trim();
    if (actualTextContent !== expectedTextContent) {
      missedExpectations.push(
        `Expected node contents to be ${expectedTextContent} but was ${actualTextContent}`,
      );
    }
  }

  function checkNodeDescendants(node: Element, expectedNode: NodeContent, currentIndex: number) {
    let expectedDescendant = 0;