无法在Lambda表达式内触发异常

我是Java 8的新手，并尝试在lambda表达式中引发异常，如下所示：如果subQty小于min或大于max，在这种情况下，我的单元测试将min / max计算为182和255，并且我提交的subQty为10，因此它应该引发异常并且未通过此单元测试。但是，我一直在开绿灯，为什么呢？

public void verifyingIndividualSubmissionValueLimits(String alias, double min, double max)
    // ... some code here ...

    // Get local stock price
    CompletableFuture<Double> localPriceFuture = instrumentRequester.getMidPrice(instId);

    // Calculate the min and max quantity
    localPriceFuture.thenAcceptBoth(dollarFxRateFuture,
            (localPrice, fxRate) -> {
                double minLocalValue = min * fxRate;
                double maxLocalValue = max * fxRate;
                long minQuantity = Math.round(minLocalValue / localPrice);
                long maxQuantity = Math.round(maxLocalValue / localPrice);
                if (subQty < minQuantity || subQty > maxQuantity) {
                    log.debug("We should throw an exception because subQty is {}", subQty);
                    throw new SubmissionValidationException(String.format("Quantity: %s, is not within %s and %s", subQty, minQuantity, maxQuantity));
                }
            }
    );
}