Files are generated under the wrong folder if no node_modules folder exists

[tido64]

This looks like a bug in RNTA. node_modules is no longer created under /apps/fluent-tester, so it generates Windows project files under /node_modules instead while app.json assumes /apps/fluent-tester/node_modules. As a workaround, you can do this:

diff --git a/apps/fluent-tester/react-native.config.js b/apps/fluent-tester/react-native.config.js
index 1bae4e2a6..12ee75eea 100644
--- a/apps/fluent-tester/react-native.config.js
+++ b/apps/fluent-tester/react-native.config.js
@@ -1,7 +1,7 @@
 const project = (() => {
   try {
     const { configureProjects } = require('react-native-test-app');
-    return configureProjects({
+    const project = configureProjects({
       android: {
         sourceDir: 'android',
       },
@@ -13,6 +13,11 @@ const project = (() => {
         solutionFile: 'windows/FluentTester.sln',
       },
     });
+    // FIXME: https://github.com/microsoft/react-native-test-app/issues/1529
+    if (project.windows) {
+      project.windows.project.projectFile = '..\\..\\' + project.windows.project.projectFile;
+    }
+    return project;
   } catch (_) {
     return undefined;
   }

Originally posted by @tido64 in microsoft/fluentui-react-native#2980 (comment)