Function checkLevel

src/material/tree/tree.spec.ts:776–793

(node: Element, expectedNode: NodeContent)

  }

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

    // Some browsers return 0, while others return 0px.
    const actualLevel = rawLevel === '0' ? '0px' : rawLevel;
    if (expectedNode.length === 1) {
      if (actualLevel !== `` && actualLevel !== '0px') {
        missedExpectations.push(`Expected node level to be 0px but was ${actualLevel}`);
      }
    } else {
      const expectedLevel = `${(expectedNode.length - 1) * expectedPaddingIndent}px`;
      if (actualLevel != expectedLevel) {
        missedExpectations.push(
          `Expected node level to be ${expectedLevel} but was ${actualLevel}`,
        );
      }
    }
  }

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