dangling (invalid) eslint warnings

packages/app-testing/src/CallSelect.js

@@ -14,6 +14,7 @@ import extrinsics from './extrinsics';
 
 type Props = BaseProps & {};
 
+// eslint-disable-next-line no-unused-vars
 const onChange = (event: SyntheticEvent<*>, { value }): void => {
   extrinsicName.next(value);
 };

packages/app-testing/src/InputAddress/index.js

@@ -32,6 +32,7 @@ const testOptions = keyring.getPairs().map((pair) => {
 });
 
 export default function InputAddress (props: Props): React$Node {
+  // eslint-disable-next-line no-unused-vars
   const onChange = (event: SyntheticEvent<*>, { value }): void => {
     if (props.subject) {
       props.subject.next(value);

packages/app-testing/src/Staking/Transfer/Amount.js

@@ -14,6 +14,7 @@ import { amount } from './subjects';
 
 type Props = BaseProps & {};
 
+// eslint-disable-next-line no-unused-vars
 const onChange = (event: SyntheticEvent<*>, { value }): void => {
   amount.next(
     new BN(value || 0)