Resolve the true entry point during tests (#21505)

* Resolve the entry point for tests the same way builds do

This way the source tests, test the same entry point configuration.

* Gate test selectors on www

These are currently only exposed in www builds

* Gate createEventHandle / useFocus on www

These are enabled in both www variants but not OSS experimental.

* Temporarily disable www-modern entry point

Use the main one that has all the exports until we fix more tests.

* Remove enableCache override that's no longer correct

* Open gates for www

These used to not be covered because they used Cache which wasn't exposed.

packages/react-dom/src/__tests__/ReactDOMFiberAsync-test.js

@@ -286,7 +286,7 @@ describe('ReactDOMFiberAsync', () => {
       expect(ops).toEqual(['BC', 'ABCD']);
     });
 
-    // @gate experimental
+    // @gate experimental || www
     it('flushControlled flushes updates before yielding to browser', () => {
       let inst;
       class Counter extends React.Component {
@@ -326,7 +326,7 @@ describe('ReactDOMFiberAsync', () => {
       ]);
     });
 
-    // @gate experimental
+    // @gate experimental || www
     it('flushControlled does not flush until end of outermost batchedUpdates', () => {
       let inst;
       class Counter extends React.Component {
@@ -357,7 +357,7 @@ describe('ReactDOMFiberAsync', () => {
       ]);
     });
 
-    // @gate experimental
+    // @gate experimental || www
     it('flushControlled returns nothing', () => {
       // In the future, we may want to return a thenable "work" object.
       let inst;

packages/react-dom/src/__tests__/ReactDOMServerPartialHydration-test.internal.js

@@ -571,7 +571,7 @@ describe('ReactDOMServerPartialHydration', () => {
     expect(span.className).toBe('hi');
   });
 
-  // @gate experimental
+  // @gate experimental || www
   it('blocks updates to hydrate the content first if props changed at idle priority', async () => {
     let suspend = false;
     let resolve;
@@ -1498,7 +1498,7 @@ describe('ReactDOMServerPartialHydration', () => {
     expect(container.textContent).toBe('ALoading B');
   });
 
-  // @gate experimental
+  // @gate experimental || www
   it('clears server boundaries when SuspenseList runs out of time hydrating', async () => {
     let suspend = false;
     let resolve;
@@ -1912,7 +1912,7 @@ describe('ReactDOMServerPartialHydration', () => {
     document.body.removeChild(container);
   });
 
-  // @gate experimental
+  // @gate www
   it('does not invoke an event on a hydrated event handle until it commits', async () => {
     const setClick = ReactDOM.unstable_createEventHandle('click');
     let suspend = false;
@@ -2077,7 +2077,7 @@ describe('ReactDOMServerPartialHydration', () => {
     document.body.removeChild(container);
   });
 
-  // @gate experimental
+  // @gate www
   it('invokes discrete events on nested suspense boundaries in a root (createEventHandle)', async () => {
     let suspend = false;
     let isServerRendering = true;
@@ -2617,7 +2617,7 @@ describe('ReactDOMServerPartialHydration', () => {
     expect(span.innerHTML).toBe('Hidden child');
   });
 
-  // @gate experimental
+  // @gate experimental || www
   it('renders a hidden LegacyHidden component inside a Suspense boundary', async () => {
     const ref = React.createRef();
 
@@ -2646,7 +2646,7 @@ describe('ReactDOMServerPartialHydration', () => {
     expect(span.innerHTML).toBe('Hidden child');
   });
 
-  // @gate experimental
+  // @gate experimental || www
   it('renders a visible LegacyHidden component', async () => {
     const ref = React.createRef();
 

packages/react-dom/src/__tests__/ReactDOMServerSelectiveHydration-test.internal.js

@@ -369,7 +369,7 @@ describe('ReactDOMServerSelectiveHydration', () => {
     document.body.removeChild(container);
   });
 
-  // @gate experimental
+  // @gate www
   it('hydrates the target boundary synchronously during a click (createEventHandle)', async () => {
     const setClick = ReactDOM.unstable_createEventHandle('click');
     let isServerRendering = true;
@@ -438,7 +438,7 @@ describe('ReactDOMServerSelectiveHydration', () => {
     document.body.removeChild(container);
   });
 
-  // @gate experimental
+  // @gate www
   it('hydrates at higher pri if sync did not work first time (createEventHandle)', async () => {
     let suspend = false;
     let isServerRendering = true;
@@ -526,7 +526,7 @@ describe('ReactDOMServerSelectiveHydration', () => {
     document.body.removeChild(container);
   });
 
-  // @gate experimental
+  // @gate www
   it('hydrates at higher pri for secondary discrete events (createEventHandle)', async () => {
     const setClick = ReactDOM.unstable_createEventHandle('click');
     let suspend = false;
@@ -812,7 +812,7 @@ describe('ReactDOMServerSelectiveHydration', () => {
     document.body.removeChild(container);
   });
 
-  // @gate experimental
+  // @gate experimental || www
   it('hydrates the last explicitly hydrated target at higher priority', async () => {
     function Child({text}) {
       Scheduler.unstable_yieldValue(text);
@@ -861,7 +861,7 @@ describe('ReactDOMServerSelectiveHydration', () => {
     expect(Scheduler).toFlushAndYield(['App', 'C', 'B', 'A']);
   });
 
-  // @gate experimental
+  // @gate experimental || www
   it('hydrates before an update even if hydration moves away from it', async () => {
     function Child({text}) {
       Scheduler.unstable_yieldValue(text);