Function assertRange

examples/acceptance/zoom-state.ts:10–21

(
  label: string,
  actual: { start: number; end: number },
  expectedStart: number,
  expectedEnd: number,
)

};

const assertRange = (
  label: string,
  actual: { start: number; end: number },
  expectedStart: number,
  expectedEnd: number,
): void => {
  if (actual.start !== expectedStart || actual.end !== expectedEnd) {
    throw new Error(
      `${label}: expected { start: ${expectedStart}, end: ${expectedEnd} } but got { start: ${actual.start}, end: ${actual.end} }`,
    );
  }
};

const assertApprox = (label: string, actual: number, expected: number, eps: number): void => {
  if (!Number.isFinite(actual) || Math.abs(actual - expected) > eps) {