Unable to get waitForXHR to work with a trigger

[kretschmannj]

I have successful examples of 'listenXHR', 'getXHR', waitForFirstXHR, waitForFirstXHR with a trigger and waitForXHR with no trigger. However, I'm unable to get waitForXHR to work with a trigger. Here's my code:

		// example of waitForXHR with a trigger - doesn't work - 0 results found
		browser.url("https://magellanrx.com/member/")
		browser.waitForXHR('', 5000, trigger => {
			browser.click('xpath', "//a[@class='btn-registration default-custom-button link-button']")
		}, xhrs => { // get all the XHRs
			console.log("\n** " + xhrs.length + " requests found **\n")
			// console.log('URL: ' + xhrs[0].url + '\n')
		})

Does anyone have a working example of waitForXHR with a trigger?