fix(php): Fix test directory structure (#5988)

* Fix test directory structure

* reseed php-sdk php-model

generators/php/base/src/project/PhpProject.ts

@@ -241,7 +241,7 @@ class PhpProjectFilepaths {
     }
 
     public getCoreTestsDirectory(): RelativeFilePath {
-        return join(this.getTestsDirectory(), this.getProjectDirectory(), RelativeFilePath.of(CORE_DIRECTORY_NAME));
+        return join(this.getTestsDirectory(), RelativeFilePath.of(CORE_DIRECTORY_NAME));
     }
 
     public getUtilsDirectory(): RelativeFilePath {
@@ -292,7 +292,7 @@ class ComposerJson {
             },
             "autoload-dev": {
                 "psr-4": {
-                    [`\\${this.projectName}\\Tests\\`]: `${TESTS_DIRECTORY_NAME}/`
+                    [`${this.projectName}\\Tests\\`]: `${TESTS_DIRECTORY_NAME}/`
                 }
             },
             scripts: {

generators/php/sdk/versions.yml

@@ -1,3 +1,11 @@
+- version: 0.13.4
+  changelogEntry:
+    - type: fix
+      summary: >-
+        Flatten test directory structure from `tests/package-name/**` to `tests/**` so it matches the psr-4 structure defined in composer.json.
+        Without this change, you cannot reference classes within the `tests` directory from your tests, for example, a `Helpers` class for common test utilities.
+  irVersion: 55
+
 - version: 0.13.3
   changelogEntry:
     - type: fix