Test case that goes with the slack publisher code

SlackOpportunityPublisherTest.cls

@isTest
private class SlackOpportunityPublisherTest {
static testMethod void testPostToSlack() {


SlackOpportunityPublisher.Oppty opt = new SlackOpportunityPublisher.Oppty();
opt.opptyOwnerName = 'Test';
opt.acctName = 'Test';
opt.acctIndustry = 'Test';
opt.opptyItems = 'https://www.zerionsoftware.com';
opt.monthlySumAmount = 12345;
opt.quaterlySumAmount = 123456;
opt.annualSumAmount = 123456789;
opt.amount = 123456789;


List<slackopportunitypublisher.oppty> lis = new List<slackopportunitypublisher.oppty>();
lis.add(opt);

SlackOpportunityPublisher.postToSlack(lis);

System.assertEquals(lis, lis); // Can't really test this, just put something that is true
}
}