Fix Exporting an egg in yaml format (#2172)

app/Services/Eggs/Sharing/EggExporterService.php

@@ -92,7 +92,7 @@ class EggExporterService
                 return $this->yamlExport($decoded);
             }
 
-            return str_replace(["\r\n", '\\r\\n', '\\n'], "\n", $data);
+            return str_replace("\r\n", "\n", $data);
         }
 
         if (is_array($data)) {

tests/Unit/Services/Eggs/EggExporterServiceTest.php

@@ -0,0 +1,66 @@
+<?php
+
+namespace App\Tests\Unit\Services\Eggs;
+
+use App\Services\Eggs\Sharing\EggExporterService;
+use PHPUnit\Framework\TestCase;
+
+class EggExporterServiceTest extends TestCase
+{
+    private EggExporterService $service;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->service = new EggExporterService();
+    }
+
+    public function test_yaml_export_preserves_literal_backslash_n_in_scripts(): void
+    {
+        $script = <<<'BASH'
+if [[ "${STEAM_USER}" == "" ]] || [[ "${STEAM_PASS}" == "" ]]; then
+    echo -e "steam user is not set.\n"
+    echo -e "Using anonymous user.\n"
+    STEAM_USER=anonymous
+    STEAM_PASS=""
+    STEAM_AUTH=""
+else
+    echo -e "user set to ${STEAM_USER}"
+fi
+BASH;
+
+        $result = $this->callYamlExport($script);
+
+        $this->assertStringContainsString('echo -e "steam user is not set.\n"', $result);
+        $this->assertStringContainsString('echo -e "Using anonymous user.\n"', $result);
+    }
+
+    public function test_yaml_export_preserves_literal_backslash_r_backslash_n(): void
+    {
+        $script = 'echo -e "line ending\\r\\n"';
+
+        $result = $this->callYamlExport($script);
+
+        $this->assertSame($script, $result);
+    }
+
+    public function test_yaml_export_normalizes_real_crlf_to_lf(): void
+    {
+        $script = "line one\r\nline two\r\nline three";
+
+        $result = $this->callYamlExport($script);
+
+        $this->assertSame("line one\nline two\nline three", $result);
+    }
+
+    /**
+     * Call the protected yamlExport method via reflection.
+     */
+    private function callYamlExport(mixed $data): mixed
+    {
+        $reflection = new \ReflectionMethod($this->service, 'yamlExport');
+
+        return $reflection->invoke($this->service, $data);
+    }
+}