From d71a7d8afc56fbf29a5bf3d360d510885bc5ea67 Mon Sep 17 00:00:00 2001
From: MattAgn <32499425+MattAgn@users.noreply.github.com>
Date: Wed, 13 Jan 2021 12:28:47 +0100
Subject: [PATCH] chore: restructure ByTestId queries code by predicate type
 (#608)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* refactor: add makeQueries functions

* refactor: use new query builders on byTestId

* rebase and rearrange to a bit

* add fixme

* refactor: make single function makeQueries

* doc: add TODO to do before end of pr

* fix: fix flow issue

* parametrize Queries

* chore: delete duplicated test

Co-authored-by: Michał Pierzchała <thymikee@gmail.com>
---
 src/__tests__/byTestId.test.js  | 173 ++++++++++++++++++++++++++++++++
 src/__tests__/findByApi.test.js |   6 --
 src/__tests__/getByApi.test.js  |  52 ----------
 src/__tests__/render.test.js    |  30 ------
 src/helpers/byTestId.js         |  46 +++++++++
 src/helpers/findByAPI.js        |  23 +----
 src/helpers/getByAPI.js         |  45 +--------
 src/helpers/makeQueries.js      | 114 +++++++++++++++++++++
 src/helpers/queryByAPI.js       |  26 +----
 9 files changed, 336 insertions(+), 179 deletions(-)
 create mode 100644 src/__tests__/byTestId.test.js
 delete mode 100644 src/__tests__/getByApi.test.js
 create mode 100644 src/helpers/byTestId.js
 create mode 100644 src/helpers/makeQueries.js

diff --git a/src/__tests__/byTestId.test.js b/src/__tests__/byTestId.test.js
new file mode 100644
index 00000000..ab195dbf
--- /dev/null
+++ b/src/__tests__/byTestId.test.js
@@ -0,0 +1,173 @@
+// @flow
+import React from 'react';
+import { View, Text, TextInput, TouchableOpacity, Button } from 'react-native';
+import { render } from '..';
+
+const PLACEHOLDER_FRESHNESS = 'Add custom freshness';
+const PLACEHOLDER_CHEF = 'Who inspected freshness?';
+const INPUT_FRESHNESS = 'Custom Freshie';
+const INPUT_CHEF = 'I inspected freshie';
+
+class MyButton extends React.Component<any> {
+  render() {
+    return (
+      <TouchableOpacity onPress={this.props.onPress}>
+        <Text>{this.props.children}</Text>
+      </TouchableOpacity>
+    );
+  }
+}
+
+class Banana extends React.Component<any, any> {
+  state = {
+    fresh: false,
+  };
+
+  componentDidUpdate() {
+    if (this.props.onUpdate) {
+      this.props.onUpdate();
+    }
+  }
+
+  componentWillUnmount() {
+    if (this.props.onUnmount) {
+      this.props.onUnmount();
+    }
+  }
+
+  changeFresh = () => {
+    this.setState((state) => ({
+      fresh: !state.fresh,
+    }));
+  };
+
+  render() {
+    const test = 0;
+    return (
+      <View>
+        <Text>Is the banana fresh?</Text>
+        <Text testID="bananaFresh">
+          {this.state.fresh ? 'fresh' : 'not fresh'}
+        </Text>
+        <TextInput
+          testID="bananaCustomFreshness"
+          placeholder={PLACEHOLDER_FRESHNESS}
+          value={INPUT_FRESHNESS}
+        />
+        <TextInput
+          testID="bananaChef"
+          placeholder={PLACEHOLDER_CHEF}
+          value={INPUT_CHEF}
+        />
+        <MyButton onPress={this.changeFresh} type="primary">
+          Change freshness!
+        </MyButton>
+        <Text testID="duplicateText">First Text</Text>
+        <Text testID="duplicateText">Second Text</Text>
+        <Text>{test}</Text>
+      </View>
+    );
+  }
+}
+
+const MyComponent = () => {
+  return <Text>My Component</Text>;
+};
+
+test('getByTestId returns only native elements', () => {
+  const { getByTestId, getAllByTestId } = render(
+    <View>
+      <Text testID="text">Text</Text>
+      <TextInput testID="textInput" />
+      <View testID="view" />
+      <Button testID="button" title="Button" onPress={jest.fn()} />
+      <MyComponent testID="myComponent" />
+    </View>
+  );
+
+  expect(getByTestId('text')).toBeTruthy();
+  expect(getByTestId('textInput')).toBeTruthy();
+  expect(getByTestId('view')).toBeTruthy();
+  expect(getByTestId('button')).toBeTruthy();
+
+  expect(getAllByTestId('text')).toHaveLength(1);
+  expect(getAllByTestId('textInput')).toHaveLength(1);
+  expect(getAllByTestId('view')).toHaveLength(1);
+  expect(getAllByTestId('button')).toHaveLength(1);
+
+  expect(() => getByTestId('myComponent')).toThrowError(
+    'Unable to find an element with testID: myComponent'
+  );
+  expect(() => getAllByTestId('myComponent')).toThrowError(
+    'Unable to find an element with testID: myComponent'
+  );
+});
+
+test('supports a regex matcher', () => {
+  const { getByTestId, getAllByTestId } = render(
+    <View>
+      <Text testID="text">Text</Text>
+      <TextInput testID="textInput" />
+      <View testID="view" />
+      <Button testID="button" title="Button" onPress={jest.fn()} />
+      <MyComponent testID="myComponent" />
+    </View>
+  );
+
+  expect(getByTestId(/view/)).toBeTruthy();
+  expect(getAllByTestId(/text/)).toHaveLength(2);
+});
+
+test('getByTestId, queryByTestId', () => {
+  const { getByTestId, queryByTestId } = render(<Banana />);
+  const component = getByTestId('bananaFresh');
+
+  expect(component.props.children).toBe('not fresh');
+  expect(() => getByTestId('InExistent')).toThrow(
+    'Unable to find an element with testID: InExistent'
+  );
+
+  expect(getByTestId('bananaFresh')).toBe(component);
+  expect(queryByTestId('InExistent')).toBeNull();
+});
+
+test('getAllByTestId, queryAllByTestId', () => {
+  const { getAllByTestId, queryAllByTestId } = render(<Banana />);
+  const textElements = getAllByTestId('duplicateText');
+
+  expect(textElements.length).toBe(2);
+  expect(textElements[0].props.children).toBe('First Text');
+  expect(textElements[1].props.children).toBe('Second Text');
+  expect(() => getAllByTestId('nonExistentTestId')).toThrow(
+    'Unable to find an element with testID: nonExistentTestId'
+  );
+
+  const queriedTextElements = queryAllByTestId('duplicateText');
+
+  expect(queriedTextElements.length).toBe(2);
+  expect(queriedTextElements[0]).toBe(textElements[0]);
+  expect(queriedTextElements[1]).toBe(textElements[1]);
+  expect(queryAllByTestId('nonExistentTestId')).toHaveLength(0);
+});
+
+test('findByTestId and findAllByTestId work asynchronously', async () => {
+  const options = { timeout: 10 }; // Short timeout so that this test runs quickly
+  const { rerender, findByTestId, findAllByTestId } = render(<View />);
+  await expect(findByTestId('aTestId', options)).rejects.toBeTruthy();
+  await expect(findAllByTestId('aTestId', options)).rejects.toBeTruthy();
+
+  setTimeout(
+    () =>
+      rerender(
+        <View testID="aTestId">
+          <Text>Some Text</Text>
+          <TextInput placeholder="Placeholder Text" />
+          <TextInput value="Display Value" />
+        </View>
+      ),
+    20
+  );
+
+  await expect(findByTestId('aTestId')).resolves.toBeTruthy();
+  await expect(findAllByTestId('aTestId')).resolves.toHaveLength(1);
+}, 20000);
diff --git a/src/__tests__/findByApi.test.js b/src/__tests__/findByApi.test.js
index 25cdffed..e0020f9e 100644
--- a/src/__tests__/findByApi.test.js
+++ b/src/__tests__/findByApi.test.js
@@ -7,8 +7,6 @@ test('findBy queries work asynchronously', async () => {
   const options = { timeout: 10 }; // Short timeout so that this test runs quickly
   const {
     rerender,
-    findByTestId,
-    findAllByTestId,
     findByText,
     findAllByText,
     findByPlaceholderText,
@@ -16,8 +14,6 @@ test('findBy queries work asynchronously', async () => {
     findByDisplayValue,
     findAllByDisplayValue,
   } = render(<View />);
-  await expect(findByTestId('aTestId', options)).rejects.toBeTruthy();
-  await expect(findAllByTestId('aTestId', options)).rejects.toBeTruthy();
   await expect(findByText('Some Text', options)).rejects.toBeTruthy();
   await expect(findAllByText('Some Text', options)).rejects.toBeTruthy();
   await expect(
@@ -45,8 +41,6 @@ test('findBy queries work asynchronously', async () => {
     20
   );
 
-  await expect(findByTestId('aTestId')).resolves.toBeTruthy();
-  await expect(findAllByTestId('aTestId')).resolves.toHaveLength(1);
   await expect(findByText('Some Text')).resolves.toBeTruthy();
   await expect(findAllByText('Some Text')).resolves.toHaveLength(1);
   await expect(findByPlaceholderText('Placeholder Text')).resolves.toBeTruthy();
diff --git a/src/__tests__/getByApi.test.js b/src/__tests__/getByApi.test.js
deleted file mode 100644
index 177af8b0..00000000
--- a/src/__tests__/getByApi.test.js
+++ /dev/null
@@ -1,52 +0,0 @@
-// @flow
-import * as React from 'react';
-import { View, Text, TextInput, Button } from 'react-native';
-import { render } from '..';
-
-const MyComponent = () => {
-  return <Text>My Component</Text>;
-};
-
-test('getByTestId returns only native elements', () => {
-  const { getByTestId, getAllByTestId } = render(
-    <View>
-      <Text testID="text">Text</Text>
-      <TextInput testID="textInput" />
-      <View testID="view" />
-      <Button testID="button" title="Button" onPress={jest.fn()} />
-      <MyComponent testID="myComponent" />
-    </View>
-  );
-
-  expect(getByTestId('text')).toBeTruthy();
-  expect(getByTestId('textInput')).toBeTruthy();
-  expect(getByTestId('view')).toBeTruthy();
-  expect(getByTestId('button')).toBeTruthy();
-
-  expect(getAllByTestId('text')).toHaveLength(1);
-  expect(getAllByTestId('textInput')).toHaveLength(1);
-  expect(getAllByTestId('view')).toHaveLength(1);
-  expect(getAllByTestId('button')).toHaveLength(1);
-
-  expect(() => getByTestId('myComponent')).toThrowError(
-    'No instances found with testID: myComponent'
-  );
-  expect(() => getAllByTestId('myComponent')).toThrowError(
-    'No instances found with testID: myComponent'
-  );
-});
-
-test('supports a regex matcher', () => {
-  const { getByTestId, getAllByTestId } = render(
-    <View>
-      <Text testID="text">Text</Text>
-      <TextInput testID="textInput" />
-      <View testID="view" />
-      <Button testID="button" title="Button" onPress={jest.fn()} />
-      <MyComponent testID="myComponent" />
-    </View>
-  );
-
-  expect(getByTestId(/view/)).toBeTruthy();
-  expect(getAllByTestId(/text/)).toHaveLength(2);
-});
diff --git a/src/__tests__/render.test.js b/src/__tests__/render.test.js
index 760eac5e..f2f46ade 100644
--- a/src/__tests__/render.test.js
+++ b/src/__tests__/render.test.js
@@ -79,36 +79,6 @@ class Banana extends React.Component<any, any> {
   }
 }
 
-test('getByTestId, queryByTestId', () => {
-  const { getByTestId, queryByTestId } = render(<Banana />);
-  const component = getByTestId('bananaFresh');
-
-  expect(component.props.children).toBe('not fresh');
-  expect(() => getByTestId('InExistent')).toThrow('No instances found');
-
-  expect(getByTestId('bananaFresh')).toBe(component);
-  expect(queryByTestId('InExistent')).toBeNull();
-});
-
-test('getAllByTestId, queryAllByTestId', () => {
-  const { getAllByTestId, queryAllByTestId } = render(<Banana />);
-  const textElements = getAllByTestId('duplicateText');
-
-  expect(textElements.length).toBe(2);
-  expect(textElements[0].props.children).toBe('First Text');
-  expect(textElements[1].props.children).toBe('Second Text');
-  expect(() => getAllByTestId('nonExistentTestId')).toThrow(
-    'No instances found'
-  );
-
-  const queriedTextElements = queryAllByTestId('duplicateText');
-
-  expect(queriedTextElements.length).toBe(2);
-  expect(queriedTextElements[0]).toBe(textElements[0]);
-  expect(queriedTextElements[1]).toBe(textElements[1]);
-  expect(queryAllByTestId('nonExistentTestId')).toHaveLength(0);
-});
-
 test('UNSAFE_getAllByType, UNSAFE_queryAllByType', () => {
   const { UNSAFE_getAllByType, UNSAFE_queryAllByType } = render(<Banana />);
   const [text, status, button] = UNSAFE_getAllByType(Text);
diff --git a/src/helpers/byTestId.js b/src/helpers/byTestId.js
new file mode 100644
index 00000000..5c8efd63
--- /dev/null
+++ b/src/helpers/byTestId.js
@@ -0,0 +1,46 @@
+// @flow
+import { makeQueries } from './makeQueries';
+import type { Queries } from './makeQueries';
+
+const getNodeByTestId = (node, testID) => {
+  return typeof testID === 'string'
+    ? testID === node.props.testID
+    : testID.test(node.props.testID);
+};
+
+const queryAllByTestId = (
+  instance: ReactTestInstance
+): ((testId: string | RegExp) => Array<ReactTestInstance>) =>
+  function getAllByTestIdFn(testId) {
+    const results = instance
+      .findAll((node) => getNodeByTestId(node, testId))
+      .filter((element) => typeof element.type === 'string');
+
+    return results;
+  };
+
+const getMultipleError = (testId) =>
+  `Found multiple elements with testID: ${String(testId)}`;
+const getMissingError = (testId) =>
+  `Unable to find an element with testID: ${String(testId)}`;
+
+const {
+  getBy: getByTestId,
+  getAllBy: getAllByTestId,
+  queryBy: queryByTestId,
+  findBy: findByTestId,
+  findAllBy: findAllByTestId,
+}: Queries<string | RegExp> = makeQueries(
+  queryAllByTestId,
+  getMissingError,
+  getMultipleError
+);
+
+export {
+  getByTestId,
+  getAllByTestId,
+  queryByTestId,
+  findByTestId,
+  findAllByTestId,
+  queryAllByTestId,
+};
diff --git a/src/helpers/findByAPI.js b/src/helpers/findByAPI.js
index ea1e879d..c5f4a13e 100644
--- a/src/helpers/findByAPI.js
+++ b/src/helpers/findByAPI.js
@@ -2,8 +2,6 @@
 import waitFor from '../waitFor';
 import type { WaitForOptions } from '../waitFor';
 import {
-  getByTestId,
-  getAllByTestId,
   getByText,
   getAllByText,
   getByPlaceholderText,
@@ -11,6 +9,7 @@ import {
   getByDisplayValue,
   getAllByDisplayValue,
 } from './getByAPI';
+import { findAllByTestId, findByTestId } from './byTestId';
 import { throwRenamedFunctionError } from './errors';
 
 export type FindByAPI = {|
@@ -57,26 +56,6 @@ const makeFindQuery = <Text, Result>(
   waitForOptions: WaitForOptions
 ): Promise<Result> => waitFor(() => getQuery(instance)(text), waitForOptions);
 
-export const findByTestId = (
-  instance: ReactTestInstance
-): ((
-  testId: string | RegExp,
-  waitForOptions?: WaitForOptions
-) => Promise<ReactTestInstance>) => (
-  testId: string | RegExp,
-  waitForOptions: WaitForOptions = {}
-) => makeFindQuery(instance, getByTestId, testId, waitForOptions);
-
-export const findAllByTestId = (
-  instance: ReactTestInstance
-): ((
-  testId: string | RegExp,
-  waitForOptions?: WaitForOptions
-) => Promise<Array<ReactTestInstance>>) => (
-  testId: string | RegExp,
-  waitForOptions: WaitForOptions = {}
-) => makeFindQuery(instance, getAllByTestId, testId, waitForOptions);
-
 export const findByText = (
   instance: ReactTestInstance
 ): ((
diff --git a/src/helpers/getByAPI.js b/src/helpers/getByAPI.js
index d0774557..9f6a0d5c 100644
--- a/src/helpers/getByAPI.js
+++ b/src/helpers/getByAPI.js
@@ -8,6 +8,7 @@ import {
   throwRemovedFunctionError,
   throwRenamedFunctionError,
 } from './errors';
+import { getAllByTestId, getByTestId } from './byTestId';
 
 export type GetByAPI = {|
   getByText: (text: string | RegExp) => ReactTestInstance,
@@ -117,12 +118,6 @@ const getTextInputNodeByDisplayValue = (node, value) => {
   }
 };
 
-const getNodeByTestId = (node, testID) => {
-  return typeof testID === 'string'
-    ? testID === node.props.testID
-    : testID.test(node.props.testID);
-};
-
 export const getByText = (
   instance: ReactTestInstance
 ): ((text: string | RegExp) => ReactTestInstance) =>
@@ -169,27 +164,6 @@ export const getByDisplayValue = (
     }
   };
 
-export const getByTestId = (
-  instance: ReactTestInstance
-): ((testID: string | RegExp) => ReactTestInstance) =>
-  function getByTestIdFn(testID: string | RegExp) {
-    try {
-      const results = getAllByTestId(instance)(testID);
-      if (results.length === 1) {
-        return results[0];
-      } else {
-        throw new ErrorWithStack(
-          ` Expected 1 but found ${
-            results.length
-          } instances with testID: ${String(testID)}`,
-          getByTestIdFn
-        );
-      }
-    } catch (error) {
-      throw new ErrorWithStack(prepareErrorMessage(error), getByTestIdFn);
-    }
-  };
-
 export const getAllByText = (
   instance: ReactTestInstance
 ): ((text: string | RegExp) => Array<ReactTestInstance>) =>
@@ -236,23 +210,6 @@ export const getAllByDisplayValue = (
     return results;
   };
 
-export const getAllByTestId = (
-  instance: ReactTestInstance
-): ((testID: string | RegExp) => Array<ReactTestInstance>) =>
-  function getAllByTestIdFn(testID: string | RegExp): ReactTestInstance[] {
-    const results = instance
-      .findAll((node) => getNodeByTestId(node, testID))
-      .filter((element) => typeof element.type === 'string');
-
-    if (results.length === 0) {
-      throw new ErrorWithStack(
-        `No instances found with testID: ${String(testID)}`,
-        getAllByTestIdFn
-      );
-    }
-    return results;
-  };
-
 export const UNSAFE_getByType = (
   instance: ReactTestInstance
 ): ((type: React.ComponentType<any>) => ReactTestInstance) =>
diff --git a/src/helpers/makeQueries.js b/src/helpers/makeQueries.js
new file mode 100644
index 00000000..35aa7d4b
--- /dev/null
+++ b/src/helpers/makeQueries.js
@@ -0,0 +1,114 @@
+// @flow
+import waitFor from '../waitFor';
+import type { WaitForOptions } from '../waitFor';
+import { ErrorWithStack } from './errors';
+
+type QueryFunction<ArgType, ReturnType> = (
+  instance: ReactTestInstance
+) => (args: ArgType) => ReturnType;
+
+type FindQueryFunction<ArgType, ReturnType> = (
+  instance: ReactTestInstance
+) => (args: ArgType, waitForOptions?: WaitForOptions) => Promise<ReturnType>;
+
+type QueryAllByQuery<QueryArg> = QueryFunction<
+  QueryArg,
+  Array<ReactTestInstance>
+>;
+type QueryByQuery<QueryArg> = QueryFunction<QueryArg, null | ReactTestInstance>;
+
+type GetAllByQuery<QueryArg> = QueryFunction<
+  QueryArg,
+  Array<ReactTestInstance>
+>;
+type GetByQuery<QueryArg> = QueryFunction<QueryArg, ReactTestInstance>;
+
+type FindAllByQuery<QueryArg> = FindQueryFunction<
+  QueryArg,
+  Array<ReactTestInstance>
+>;
+type FindByQuery<QueryArg> = FindQueryFunction<QueryArg, ReactTestInstance>;
+
+export type Queries<QueryArg> = {
+  getBy: GetByQuery<QueryArg>,
+  getAllBy: GetAllByQuery<QueryArg>,
+  queryBy: QueryByQuery<QueryArg>,
+  findBy: FindByQuery<QueryArg>,
+  findAllBy: FindAllByQuery<QueryArg>,
+};
+
+export function makeQueries<QueryArg>(
+  queryAllByQuery: QueryAllByQuery<QueryArg>,
+  getMissingError: (args: QueryArg) => string,
+  getMultipleError: (args: QueryArg) => string
+): Queries<QueryArg> {
+  function getAllByQuery(instance: ReactTestInstance) {
+    return function getAllFn(args: QueryArg) {
+      const results = queryAllByQuery(instance)(args);
+
+      if (results.length === 0) {
+        throw new ErrorWithStack(getMissingError(args), getAllFn);
+      }
+
+      return results;
+    };
+  }
+
+  function queryByQuery(instance: ReactTestInstance) {
+    return function singleQueryFn(args: QueryArg) {
+      const results = queryAllByQuery(instance)(args);
+
+      if (results.length > 1) {
+        throw new ErrorWithStack(getMultipleError(args), singleQueryFn);
+      }
+
+      if (results.length === 0) {
+        return null;
+      }
+
+      return results[0];
+    };
+  }
+
+  function getByQuery(instance: ReactTestInstance) {
+    return function getFn(args: QueryArg) {
+      const results = queryAllByQuery(instance)(args);
+
+      if (results.length > 1) {
+        throw new ErrorWithStack(getMultipleError(args), getFn);
+      }
+
+      if (results.length === 0) {
+        throw new ErrorWithStack(getMissingError(args), getFn);
+      }
+
+      return results[0];
+    };
+  }
+
+  function findAllByQuery(instance: ReactTestInstance) {
+    return function findAllFn(
+      args: QueryArg,
+      waitForOptions?: WaitForOptions = {}
+    ) {
+      return waitFor(() => getAllByQuery(instance)(args), waitForOptions);
+    };
+  }
+
+  function findByQuery(instance: ReactTestInstance) {
+    return function findFn(
+      args: QueryArg,
+      waitForOptions?: WaitForOptions = {}
+    ) {
+      return waitFor(() => getByQuery(instance)(args), waitForOptions);
+    };
+  }
+
+  return {
+    getBy: getByQuery,
+    getAllBy: getAllByQuery,
+    queryBy: queryByQuery,
+    findBy: findByQuery,
+    findAllBy: findAllByQuery,
+  };
+}
diff --git a/src/helpers/queryByAPI.js b/src/helpers/queryByAPI.js
index 0e7f4fc0..a17c646c 100644
--- a/src/helpers/queryByAPI.js
+++ b/src/helpers/queryByAPI.js
@@ -1,11 +1,9 @@
 // @flow
 import * as React from 'react';
 import {
-  getByTestId,
   getByText,
   getByPlaceholderText,
   getByDisplayValue,
-  getAllByTestId,
   getAllByText,
   getAllByPlaceholderText,
   getAllByDisplayValue,
@@ -14,6 +12,7 @@ import {
   UNSAFE_getAllByType,
   UNSAFE_getAllByProps,
 } from './getByAPI';
+import { queryByTestId, queryAllByTestId } from './byTestId';
 import {
   createQueryByError,
   throwRemovedFunctionError,
@@ -89,17 +88,6 @@ export const queryByDisplayValue = (
     }
   };
 
-export const queryByTestId = (
-  instance: ReactTestInstance
-): ((testID: string | RegExp) => ReactTestInstance | null) =>
-  function queryByTestIdFn(testID: string | RegExp) {
-    try {
-      return getByTestId(instance)(testID);
-    } catch (error) {
-      return createQueryByError(error, queryByTestIdFn);
-    }
-  };
-
 export const queryAllByText = (
   instance: ReactTestInstance
 ): ((text: string | RegExp) => Array<ReactTestInstance>) => (
@@ -136,18 +124,6 @@ export const queryAllByDisplayValue = (
   }
 };
 
-export const queryAllByTestId = (
-  instance: ReactTestInstance
-): ((testID: string | RegExp) => Array<ReactTestInstance>) => (
-  testID: string | RegExp
-) => {
-  try {
-    return getAllByTestId(instance)(testID);
-  } catch (error) {
-    return [];
-  }
-};
-
 export const UNSAFE_queryByType = (
   instance: ReactTestInstance
 ): ((type: React.ComponentType<any>) => ReactTestInstance | null) =>