test(functions): increase code coverage #852

Job	Run time
Examples	4m 18s
xcodebuild (16) (test, IOS, 16.2)	3m 50s
xcodebuild (15) (test, IOS, 15.4)	6m 2s
xcodebuild (16) (test, MACOS, 16.2)	2m 22s
xcodebuild (15) (test, MAC_CATALYST, 15.4)	4m 18s
xcodebuild (16) (IOS, 16.2)	2m 29s
xcodebuild (15) (test, MACOS, 15.4)	3m 45s
xcodebuild (16) (MACOS, 16.2)	2m 42s
xcodebuild (15) (test, TVOS, 15.4)	4m 2s
xcodebuild (15) (test, VISIONOS, 15.4)	4m 52s
xcodebuild (15) (IOS, 15.2)	4m 22s
xcodebuild (15) (IOS, 15.4)	3m 35s
xcodebuild (15) (MAC_CATALYST, 15.4)	4m 47s
xcodebuild (15) (MACOS, 15.2)	4m 15s
xcodebuild (15) (MACOS, 15.4)	3m 52s
xcodebuild (15) (TVOS, 15.4)	3m 55s
xcodebuild (15) (VISIONOS, 15.4)	4m 2s
xcodebuild (15) (WATCHOS, 15.4)	4m 3s
	1h 11m 31s

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