More tests on dates with fractional seconds (#106)

Based on the discussion here
swiftlang/swift-foundation#1561 (comment)
, I added a few more tests around dates with fractional seconds

Author: sebsto

Tests/AWSLambdaEventsTests/S3Tests.swift

@@ -112,6 +112,8 @@ struct S3Tests {
         #expect(record.awsRegion == .eu_central_1)
         #expect(record.eventName == "ObjectCreated:Put")
         #expect(record.eventTime.ISO8601Format() == Date(timeIntervalSince1970: 1_578_907_540.621).ISO8601Format())
+        // see https://github.com/swiftlang/swift-foundation/issues/1561#issuecomment-3448853449
+        #expect(abs(record.eventTime.timeIntervalSince1970 - 1_578_907_540.621) < 0.0005)
         #expect(record.userIdentity == S3Event.UserIdentity(principalId: "AWS:AAAAAAAJ2MQ4YFQZ7AULJ"))
         #expect(record.requestParameters == S3Event.RequestParameters(sourceIPAddress: "123.123.123.123"))
         #expect(record.responseElements.count == 2)
@@ -136,6 +138,8 @@ struct S3Tests {
         #expect(record.awsRegion == .eu_central_1)
         #expect(record.eventName == "ObjectRemoved:DeleteMarkerCreated")
         #expect(record.eventTime.ISO8601Format() == Date(timeIntervalSince1970: 1_578_907_540.621).ISO8601Format())
+        // see https://github.com/swiftlang/swift-foundation/issues/1561#issuecomment-3448853449
+        #expect(abs(record.eventTime.timeIntervalSince1970 - 1_578_907_540.621) < 0.0005)
         #expect(record.userIdentity == S3Event.UserIdentity(principalId: "AWS:AAAAAAAJ2MQ4YFQZ7AULJ"))
         #expect(record.requestParameters == S3Event.RequestParameters(sourceIPAddress: "123.123.123.123"))
         #expect(record.responseElements.count == 2)

Tests/AWSLambdaEventsTests/Utils/DateWrapperTests.swift

@@ -68,7 +68,11 @@ struct DateWrapperTests {
         #if swift(<6.2)
         let error = (any Error).self
         #else
+        #if canImport(FoundationEssentials)
         let error = Never.self
+        #else
+        let error = (any Error).self
+        #endif
         #endif
         #expect(throws: error) {
             try JSONDecoder().decode(TestEvent.self, from: json.data(using: .utf8)!)