Add an XCTest target
Create first test of default platforms
Tests for default service and discovery provider classes availability
Rename ConnectSDKTests => ConnectSDKDefaultPlatformsTests class
Create SSDPDiscoveryProviderTests with a few simple tests
Test of SSDP M-SEARCH request correctness
Test of SSDP delegate's discoveryProvider:didFindService: method
ServiceDescription: fix cloning (`type` property)
Test of SSDP delegate's discoveryProvider:didLoseService: method
ServiceDescription: implement equality check
Start and stop tests for ZeroConfDiscoveryProvider class
Delegate tests for ZeroConfDiscoveryProvider class
Negative ZeroConfDiscoveryProvider delegate tests
Add tests for ZeroConfDiscoveryProvider class
Add license information to test files
Add comments for test methods
ServiceDescription: rename macro PROP => STRING_PROPERTY
Merge pull request #3 from eunikolsky/xctest

Initial tests for SSDP and Zeroconf discovery providers