Beta support for Swift Testing (#25)

* Beta support for Swift Testing.

* wip

* wip

* fix

* wip

* update snaps

* update snapshot testing to 1.17

* wip

* Updates

* wip

---------

Co-authored-by: Stephen Celis <[email protected]>

Author: mbrandonw

.swiftpm/configuration/Package.resolved

@@ -18,7 +18,7 @@ let package = Package(
   ],
   dependencies: [
     .package(url: "https://github.com/apple/swift-syntax", "509.0.0"..<"601.0.0-prerelease"),
-    .package(url: "https://github.com/pointfreeco/swift-snapshot-testing", from: "1.16.0"),
+    .package(url: "https://github.com/pointfreeco/swift-snapshot-testing", from: "1.17.1"),
   ],
   targets: [
     .target(