Add test

Following facebook#9230 (comment) except that `foo={true}` renders an empty string. See facebook#9230 (comment) for rationale.
eps1lon · May 11, 2022 · 1a617a4 · 1a617a4
1 parent aed6ac4
commit 1a617a4
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Showing 3 changed files with 41 additions and 7 deletions.
diff --git a/packages/react-dom/src/__tests__/DOMPropertyOperations-test.js b/packages/react-dom/src/__tests__/DOMPropertyOperations-test.js
@@ -10,7 +10,10 @@
 'use strict';
 
 // Set by `yarn test-fire`.
-const {disableInputAttributeSyncing} = require('shared/ReactFeatureFlags');
+const {
+  enableCustomElementPropertySupport,
+  disableInputAttributeSyncing,
+} = require('shared/ReactFeatureFlags');
 
 describe('DOMPropertyOperations', () => {
   let React;
@@ -256,8 +259,12 @@ describe('DOMPropertyOperations', () => {
       expect(customElement.getAttribute('onstring')).toBe('hello');
       expect(customElement.getAttribute('onobj')).toBe('[object Object]');
       expect(customElement.getAttribute('onarray')).toBe('one,two');
-      expect(customElement.getAttribute('ontrue')).toBe('true');
-      expect(customElement.getAttribute('onfalse')).toBe('false');
+      expect(customElement.getAttribute('ontrue')).toBe(
+        enableCustomElementPropertySupport ? '' : 'true',
+      );
+      expect(customElement.getAttribute('onfalse')).toBe(
+        enableCustomElementPropertySupport ? null : 'false',
+      );
 
       // Dispatch the corresponding event names to make sure that nothing crashes.
       customElement.dispatchEvent(new Event('string'));
@@ -959,6 +966,21 @@ describe('DOMPropertyOperations', () => {
       expect(customElement.foo).toBe(null);
     });
 
+    // @gate enableCustomElementPropertySupport
+    it('boolean props should not be stringified in attributes', () => {
+      const container = document.createElement('div');
+      document.body.appendChild(container);
+      ReactDOM.render(<my-custom-element foo={true} />, container);
+      const customElement = container.querySelector('my-custom-element');
+
+      expect(customElement.getAttribute('foo')).toBe('');
+
+      // true => false
+      ReactDOM.render(<my-custom-element foo={false} />, container);
+
+      expect(customElement.getAttribute('foo')).toBe(null);
+    });
+
     // @gate enableCustomElementPropertySupport
     it('custom element custom event handlers assign multiple types', () => {
       const container = document.createElement('div');

diff --git a/packages/react-dom/src/__tests__/ReactDOMComponent-test.js b/packages/react-dom/src/__tests__/ReactDOMComponent-test.js
@@ -2689,9 +2689,13 @@ describe('ReactDOMComponent', () => {
       const container = document.createElement('div');
       ReactDOM.render(<some-custom-element foo={true} />, container);
       const node = container.firstChild;
-      expect(node.getAttribute('foo')).toBe('true');
+      expect(node.getAttribute('foo')).toBe(
+        ReactFeatureFlags.enableCustomElementPropertySupport ? '' : 'true',
+      );
       ReactDOM.render(<some-custom-element foo={false} />, container);
-      expect(node.getAttribute('foo')).toBe('false');
+      expect(node.getAttribute('foo')).toBe(
+        ReactFeatureFlags.enableCustomElementPropertySupport ? null : 'false',
+      );
       ReactDOM.render(<some-custom-element />, container);
       expect(node.hasAttribute('foo')).toBe(false);
       ReactDOM.render(<some-custom-element foo={true} />, container);

diff --git a/packages/react-dom/src/__tests__/ReactDOMServerIntegrationAttributes-test.js b/packages/react-dom/src/__tests__/ReactDOMServerIntegrationAttributes-test.js
@@ -696,12 +696,20 @@ describe('ReactDOMServerIntegration', () => {
 
     itRenders('unknown boolean `true` attributes as strings', async render => {
       const e = await render(<custom-element foo={true} />);
-      expect(e.getAttribute('foo')).toBe('true');
+      if (ReactFeatureFlags.enableCustomElementPropertySupport) {
+        expect(e.getAttribute('foo')).toBe('');
+      } else {
+        expect(e.getAttribute('foo')).toBe('true');
+      }
     });
 
     itRenders('unknown boolean `false` attributes as strings', async render => {
       const e = await render(<custom-element foo={false} />);
-      expect(e.getAttribute('foo')).toBe('false');
+      if (ReactFeatureFlags.enableCustomElementPropertySupport) {
+        expect(e.getAttribute('foo')).toBe(null);
+      } else {
+        expect(e.getAttribute('foo')).toBe('false');
+      }
     });
 
     itRenders(