Add an IIFE test

This is not a case that is important for Fast Refresh, but we shouldn't change the code semantics. This case shows the transform isn't quite correct. It's wrapping the call at the wrong place.

packages/react-refresh/src/__tests__/ReactFreshBabelPlugin-test.js

@@ -524,4 +524,16 @@ describe('ReactFreshBabelPlugin', () => {
         '". If you want to override this check, pass {skipEnvCheck: true} as plugin options.',
     );
   });
+
+  it('does not get tripped by IIFEs', () => {
+    expect(
+      transform(`
+        while (item) {
+          (item => {
+            useFoo();
+          })(item);
+        }
+      `),
+    ).toMatchSnapshot();
+  });
 });

packages/react-refresh/src/__tests__/__snapshots__/ReactFreshBabelPlugin-test.js.snap

@@ -86,6 +86,18 @@ var _c;
 $RefreshReg$(_c, "App");
 `;
 
+exports[`ReactFreshBabelPlugin does not get tripped by IIFEs 1`] = `
+while (item) {
+  var _s = $RefreshSig$();
+
+  _s(_s(item => {
+    _s();
+
+    useFoo();
+  }, "useFoo{}", true)(item), "useFoo{}", true);
+}
+`;
+
 exports[`ReactFreshBabelPlugin generates signatures for function declarations calling hooks 1`] = `
 var _s = $RefreshSig$();