Pin verbatim export of snippet and Blueprint source

tests/phpunit/tests/export/snippet-verbatim.inc

@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * File summary.
+ *
+ * ```setup-blueprint global-setup
+ * {
+ *   "steps": [
+ *     {
+ *       "step": "writeFile",
+ *       "path": "/wordpress/wp-content/mu-plugins/global-setup.php",
+ *       "data": "<?php\n\\Docs_Global_Registry::register( '\\Docs_Global' );\n"
+ *     }
+ *   ]
+ * }
+ * ```
+ *
+ * @since 1.0.0
+ */
+
+/**
+ * This is a function docblock.
+ *
+ * ```php interactive setup-blueprint=global-setup
+ * <?php
+ * require '/wordpress/wp-load.php';
+ * echo \Docs_Global::greet();
+ * ```
+ *
+ * ```expected-output
+ * Hello from \Docs_Global
+ * ```
+ *
+ * @since 1.0.0
+ */
+function snippet_verbatim_func() {}

tests/phpunit/tests/export/snippet-verbatim.php

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+<?php
+
+/**
+ * A test case for exporting snippet source verbatim.
+ */
+
+namespace WP_Parser\Tests;
+
+/**
+ * Test that snippet and Blueprint source is exported exactly as authored.
+ *
+ * Global-name prefix stripping applies to documentation prose and metadata,
+ * never to executable snippet source or Blueprint definitions.
+ */
+class Export_Snippet_Verbatim extends Export_UnitTestCase {
+
+	/**
+	 * Test that snippet code keeps fully qualified global names.
+	 */
+	public function test_snippet_code_is_verbatim() {
+
+		$this->assertEquals(
+			array(
+				array(
+					'type' => 'php-code-snippet',
+					'code' => "<?php\nrequire '/wordpress/wp-load.php';\necho \\Docs_Global::greet();",
+					'expected_output' => 'Hello from \\Docs_Global',
+					'blueprint' => 'global-setup',
+				),
+			),
+			$this->export_data['functions'][0]['doc']['code_snippets']
+		);
+	}
+
+	/**
+	 * Test that Blueprint definitions keep fully qualified global names.
+	 */
+	public function test_setup_blueprint_is_verbatim() {
+
+		$this->assertEquals(
+			array(
+				'global-setup' => array(
+					'steps' => array(
+						array(
+							'step' => 'writeFile',
+							'path' => '/wordpress/wp-content/mu-plugins/global-setup.php',
+							'data' => "<?php\n\\Docs_Global_Registry::register( '\\Docs_Global' );\n",
+						),
+					),
+				),
+			),
+			$this->export_data['functions'][0]['doc']['setup_blueprints']
+		);
+	}
+}