feat: query nested text nodes (#293)

* feat: query nested text nodes

* test on nested text nodes

* test on custom component, refactor

* remove comments

* move textContent out of module scope, fixup children check

Co-authored-by: Mariia Marchenkova <marchewka@Mariias-MacBook-Pro.local>
Co-authored-by: Michał Pierzchała <thymikee@gmail.com>

src/__tests__/queryByApi.test.js

@@ -47,3 +47,31 @@ test('queryByText not found', () => {
     ).queryByText('SomethingElse')
   ).toBeFalsy();
 });
+
+test('queryByText nested multiple <Text> in <Text>', () => {
+  expect(
+    render(
+      <Text>
+        Hello{' '}
+        <Text>
+          World
+          <Text>!{true}</Text>
+        </Text>
+      </Text>
+    ).queryByText('Hello World!')
+  ).toBeTruthy();
+});
+
+test('queryByText nested <CustomText> in <Text>', () => {
+  const CustomText = ({ children }) => {
+    return <Text>{children}</Text>;
+  };
+
+  expect(
+    render(
+      <Text>
+        Hello <CustomText>World!</CustomText>
+      </Text>
+    ).queryByText('Hello World!')
+  ).toBeTruthy();
+});

src/helpers/getByAPI.js

@@ -21,7 +21,7 @@ const getNodeByText = (node, text) => {
     const { Text } = require('react-native');
     const isTextComponent = filterNodeByType(node, Text);
     if (isTextComponent) {
-      const textChildren = getChildrenAsText(node.props.children);
+      const textChildren = getChildrenAsText(node.props.children, Text);
       if (textChildren) {
         const textToTest = textChildren.join('');
         return typeof text === 'string'
@@ -35,18 +35,24 @@ const getNodeByText = (node, text) => {
   }
 };
 
-const getChildrenAsText = children => {
-  return React.Children.map(children, child => {
+const getChildrenAsText = (children, TextComponent, textContent = []) => {
+  React.Children.forEach(children, child => {
     if (typeof child === 'string') {
-      return child;
+      textContent.push(child);
+      return;
     }
 
     if (typeof child === 'number') {
-      return child.toString();
+      textContent.push(child.toString());
+      return;
     }
 
-    return '';
+    if (child?.props?.children) {
+      getChildrenAsText(child.props.children, TextComponent, textContent);
+    }
   });
+
+  return textContent;
 };
 
 const getTextInputNodeByPlaceholder = (node, placeholder) => {