Tests: fix composer autoload

1. Make the namespace of the `VariableAnalysisTest` file reflect the path the file.
2. Add an `autoload-dev` section to the `composer.json`
    * The unit tests are not shipped in the distribution package, so they are only available in a `dev` environment, which is exactly what `autoload-dev` is targetting.
    * Setting the `tests` directory as a secondary path for PSR4 autoload should fix compatibility with Composer 2.

Author: jrfnl

composer.circleci.json

@@ -26,6 +26,11 @@
             "VariableAnalysis\\": "VariableAnalysis/"
         }
     },
+    "autoload-dev": {
+        "psr-4": {
+            "VariableAnalysis\\Tests\\": "tests/"
+        }
+    },
     "minimum-stability": "dev",
     "prefer-stable": true,
     "scripts": {

composer.json

@@ -26,6 +26,11 @@
             "VariableAnalysis\\": "VariableAnalysis/"
         }
     },
+    "autoload-dev": {
+        "psr-4": {
+            "VariableAnalysis\\Tests\\": "tests/"
+        }
+    },
     "minimum-stability": "dev",
     "prefer-stable": true,
     "scripts": {

tests/Sniffs/VariableAnalysisTest.php

@@ -1,5 +1,5 @@
 <?php
-namespace VariableAnalysis\Tests\CodeAnalysis;
+namespace VariableAnalysis\Tests\Sniffs;
 
 use VariableAnalysis\Tests\BaseTestCase;