test(postgrest): increase code coverage #868

Job	Run time
Examples	12m 39s
xcodebuild (16) (test, IOS, 16.2)	7m 54s
xcodebuild (15) (test, IOS, 15.4)	6m 1s
xcodebuild (16) (test, MACOS, 16.2)	6m 25s
xcodebuild (15) (test, MAC_CATALYST, 15.4)	5m 59s
xcodebuild (16) (IOS, 16.2)	7m 51s
xcodebuild (15) (test, MACOS, 15.4)	4m 48s
xcodebuild (16) (MACOS, 16.2)	9m 11s
xcodebuild (15) (test, TVOS, 15.4)	4m 59s
xcodebuild (15) (test, VISIONOS, 15.4)	6m 13s
xcodebuild (15) (IOS, 15.2)	4m 42s
xcodebuild (15) (IOS, 15.4)	5m 18s
xcodebuild (15) (MAC_CATALYST, 15.4)	4m 19s
xcodebuild (15) (MACOS, 15.2)	8m 9s
xcodebuild (15) (MACOS, 15.4)	4m 43s
xcodebuild (15) (TVOS, 15.4)	4m 56s
xcodebuild (15) (VISIONOS, 15.4)	6m 59s
xcodebuild (15) (WATCHOS, 15.4)	5m 41s
	1h 56m 47s

Provide feedback