Function checkNode

src/material/tree/tree.spec.ts:766–774

(node: Element, expectedNode: NodeContent)

  const missedExpectations: string[] = [];

  function checkNode(node: Element, expectedNode: NodeContent) {
    const actualTextContent = node.textContent!.trim();
    const expectedTextContent = expectedNode[expectedNode.length - 1];
    if (actualTextContent !== expectedTextContent) {
      missedExpectations.push(
        `Expected node contents to be ${expectedTextContent} but was ${actualTextContent}`,
      );
    }
  }

  function checkLevel(node: Element, expectedNode: NodeContent) {
    const rawLevel = (node as HTMLElement).style.paddingLeft;