Function checkLevel

src/cdk/tree/tree.spec.ts:1657–1666

(node: Element, expectedNode: any[])

  }

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

    // Some browsers return 0, while others return 0px.
    const actualLevel = rawLevel === '0' ? '0px' : rawLevel;
    const expectedLevel = `${expectedNode.length * expectedPaddingIndent}${expectedPaddingUnits}`;
    if (actualLevel != expectedLevel) {
      missedExpectations.push(`Expected node level to be ${expectedLevel} but was ${actualLevel}`);
    }
  }

  getNodes(treeElement).forEach((node, index) => {
    const expected = expectedTree ? expectedTree[index] : null;