Add test case for FileScanner adding class reference for configured global

tests/Internal/Scanner/FileScannerTest.php

@@ -0,0 +1,90 @@
+<?php
+
+namespace Psalm\Tests\Internal\Scanner;
+
+use Psalm\Aliases;
+use Psalm\Codebase;
+use Psalm\Config;
+use Psalm\Internal\Provider\FakeFileProvider;
+use Psalm\Internal\Provider\Providers;
+use Psalm\Internal\Scanner\FileScanner;
+use Psalm\Storage\FileStorage;
+use Psalm\Storage\FunctionStorage;
+use Psalm\Tests\TestCase;
+use Psalm\Tests\TestConfig;
+
+class FileScannerTest extends TestCase
+{
+    /**
+     * @dataProvider providerScan
+     */
+    public function testScan(
+        Config $config,
+        string $file_contents,
+        FileStorage $expected_file_storage
+    ): void {
+        $file_provider = new FakeFileProvider();
+        $codebase = new Codebase(
+            $config,
+            new Providers($file_provider),
+        );
+
+        $file_provider->registerFile('/dir/file.php', $file_contents);
+
+        $file_scanner = new FileScanner('/dir/file.php', 'file.php', true);
+        $file_storage = new FileStorage('/dir/file.php');
+        $file_scanner->scan(
+            $codebase,
+            $file_storage,
+        );
+
+        // Reset properties that are difficult to mock
+        foreach ($file_storage->functions as $function_storage) {
+            $function_storage->location = null;
+            $function_storage->stmt_location = null;
+        }
+
+        self::assertEquals($expected_file_storage, $file_storage);
+    }
+
+    /**
+     * @return iterable<string, list{Config, string, FileStorage}>
+     */
+    public static function providerScan(): iterable
+    {
+        $config = new TestConfig();
+        $config->globals['$global'] = 'GlobalClass';
+
+        $function_storage_some_function = new FunctionStorage();
+        $function_storage_some_function->cased_name = 'some_function';
+        $function_storage_some_function->required_param_count = 0;
+        $function_storage_some_function->global_variables = [
+            '$global' => true,
+        ];
+
+        $file_storage = new FileStorage('/dir/file.php');
+        $file_storage->deep_scan = true;
+        $file_storage->aliases = new Aliases();
+        $file_storage->functions = [
+            'some_function' => $function_storage_some_function,
+        ];
+        $file_storage->declaring_function_ids = [
+            'some_function' => '/dir/file.php',
+        ];
+        $file_storage->referenced_classlikes = [
+            'globalclass' => 'GlobalClass',
+        ];
+        yield 'referenceConfiguredGlobalClass' => [
+            $config,
+            <<<'PHP'
+            <?php
+
+            function some_function()
+            {
+                global $global;
+            }
+            PHP,
+            $file_storage,
+        ];
+    }
+}