Added InfoTooltip test

src/utils/InfoTooltip.tsx

@@ -10,16 +10,14 @@ interface InfoTooltipProps {
 }
 
 export const InfoTooltip: FC<InfoTooltipProps> = ({ className = '', placement, children }) => {
-  const ref = useRef<HTMLElement | null>();
+  const ref = useRef<HTMLSpanElement | null>();
+  const refCallback = (el: HTMLSpanElement) => {
+    ref.current = el;
+  };
 
   return (
     <>
-      <span
-        className={className}
-        ref={(el) => {
-          ref.current = el;
-        }}
-      >
+      <span className={className} ref={refCallback}>
         <FontAwesomeIcon icon={infoIcon} />
       </span>
       <UncontrolledTooltip target={(() => ref.current) as any} placement={placement}>{children}</UncontrolledTooltip>

test/utils/InfoTooltip.test.tsx

@@ -0,0 +1,41 @@
+import { shallow } from 'enzyme';
+import { UncontrolledTooltip } from 'reactstrap';
+import { InfoTooltip } from '../../src/utils/InfoTooltip';
+import Popper from 'popper.js';
+
+describe('<InfoTooltip />', () => {
+  it.each([
+    [ undefined ],
+    [ 'foo' ],
+    [ 'bar' ],
+  ])('renders expected className on span', (className) => {
+    const wrapper = shallow(<InfoTooltip placement="right" className={className} />);
+    const span = wrapper.find('span');
+
+    expect(span.prop('className')).toEqual(className ?? '');
+  });
+
+  it.each([
+    [ <span key={1} /> ],
+    [ 'Foo' ],
+    [ 'Hello' ],
+    [[ 'One', 'Two', <span key={3} /> ]],
+  ])('passes children down to the nested tooltip component', (children) => {
+    const wrapper = shallow(<InfoTooltip placement="right">{children}</InfoTooltip>);
+    const tooltip = wrapper.find(UncontrolledTooltip);
+
+    expect(tooltip.prop('children')).toEqual(children);
+  });
+
+  it.each([
+    [ 'right' as Popper.Placement ],
+    [ 'left' as Popper.Placement ],
+    [ 'top' as Popper.Placement ],
+    [ 'bottom' as Popper.Placement ],
+  ])('places tooltip where requested', (placement) => {
+    const wrapper = shallow(<InfoTooltip placement={placement} />);
+    const tooltip = wrapper.find(UncontrolledTooltip);
+
+    expect(tooltip.prop('placement')).toEqual(placement);
+  });
+});