Disclosure, Skeleton, and ErrorMessage test additions

[mynamesleon]

No description provided.

[github-actions]

Package	Line Rate	Branch Rate	Health
src	100%	100%	✔
src.components.AsHtml	100%	100%	✔
src.components.Checkbox	100%	100%	✔
src.components.CheckboxList	100%	100%	✔
src.components.ColorInput	100%	92%	✔
src.components.Disclosure	100%	100%	✔
src.components.EasyField	26%	0%	❌
src.components.EasyField.EasyFieldField	100%	86%	✔
src.components.EasyField.EasyFieldGroup	100%	89%	✔
src.components.EasyForm	33%	3%	❌
src.components.ErrorMessage	100%	100%	✔
src.components.Fieldset	100%	100%	✔
src.components.Input	100%	100%	✔
src.components.Label	100%	100%	✔
src.components.Notice	100%	100%	✔
src.components.Radio	100%	100%	✔
src.components.RadioList	100%	100%	✔
src.components.Select	100%	90%	✔
src.components.Skeleton	100%	100%	✔
src.components.Switch	100%	86%	✔
src.components.SwitchList	38%	7%	❌
src.components.Textarea	100%	100%	✔
src.components.ValidationSummary	100%	93%	✔
src.components.VisuallyHidden	100%	100%	✔
src.icons	100%	100%	✔
src.utils	100%	100%	✔
src.utils.capitaliseFirstLetter	100%	100%	✔
src.utils.extractKeysForSubscription	100%	100%	✔
src.utils.fieldClassName	100%	100%	✔
src.utils.flattenObject	95%	73%	✔
src.utils.focusAndSmoothlyScrollIntoView	80%	42%	✔
src.utils.focusElement	100%	94%	✔
src.utils.isElementInViewport	78%	0%	✔
src.utils.isNullOrUndefined	100%	100%	✔
src.utils.mergeRefs	100%	100%	✔
src.utils.reactKeyFrom	100%	100%	✔
src.utils.renderComponent	100%	100%	✔
src.utils.smoothlyScrollIntoView	83%	64%	✔
src.utils.useAnnounce	100%	100%	✔
src.utils.useAutoId	100%	100%	✔
src.utils.useFieldClassName	100%	100%	✔
src.utils.useFieldValue	100%	94%	✔
src.utils.useMutatedField	21%	0%	❌
src.utils.validation	100%	100%	✔
src.utils.validation.isAlpha	100%	100%	✔
src.utils.validation.isAlphaNumeric	100%	100%	✔
src.utils.validation.isDate	100%	100%	✔
src.utils.validation.isEmail	100%	100%	✔
src.utils.validation.isEmpty	100%	100%	✔
src.utils.validation.isHexColor	100%	100%	✔
src.utils.validation.isInteger	100%	100%	✔
src.utils.validation.isLowerCase	100%	100%	✔
src.utils.validation.isNumber	100%	100%	✔
src.utils.validation.isUpperCase	100%	100%	✔
src.utils.validation.isUrl	100%	100%	✔
Summary	76% (1076 / 1422)	57% (417 / 729)	✔