test: cover the global storage.randomAccessFields path in OpenDBIObject

The directive-based tests stamp randomAccessStructure in databases.ts before
the store opens, bypassing the OpenDBIObject constructor's global-config
branch. Add a focused test that opens a primary/non-primary DBI without a
directive and asserts the constructor reads storage.randomAccessFields
correctly (true -> on, false -> off, non-primary -> off).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: kriszyp

unitTests/utility/lmdb/OpenDBIObject.test.js

@@ -0,0 +1,37 @@
+require('../../testUtils');
+const assert = require('assert');
+const { OpenDBIObject } = require('#src/utility/lmdb/OpenDBIObject');
+const envMngr = require('#src/utility/environment/environmentManager');
+const { CONFIG_PARAMS } = require('#src/utility/hdbTerms');
+
+// Covers the global storage.randomAccessFields path in the OpenDBIObject constructor. The directive
+// tests (databases.test.js / randomAccessFieldsDirective.test.js) stamp dbiInit.randomAccessStructure
+// in databases.ts before the store opens, bypassing this constructor branch — so a wrong config key,
+// a non-boolean value, or a hdbTerms/YAML name mismatch would go uncaught. These open a DBI WITHOUT a
+// directive and assert the constructor reads the global config correctly.
+describe('OpenDBIObject storage.randomAccessFields global config', () => {
+	let previous;
+	beforeEach(() => {
+		previous = envMngr.get(CONFIG_PARAMS.STORAGE_RANDOMACCESSFIELDS);
+	});
+	afterEach(() => {
+		envMngr.setProperty(CONFIG_PARAMS.STORAGE_RANDOMACCESSFIELDS, previous);
+	});
+
+	it('enables randomAccessStructure on a primary DBI when the global config is true', () => {
+		envMngr.setProperty(CONFIG_PARAMS.STORAGE_RANDOMACCESSFIELDS, true);
+		assert.strictEqual(new OpenDBIObject(false, true).randomAccessStructure, true);
+	});
+
+	it('leaves randomAccessStructure off on a primary DBI when the global config is false (default)', () => {
+		envMngr.setProperty(CONFIG_PARAMS.STORAGE_RANDOMACCESSFIELDS, false);
+		assert.strictEqual(new OpenDBIObject(false, true).randomAccessStructure, false);
+	});
+
+	it('keeps randomAccessStructure off on non-primary DBIs even when the global config is true', () => {
+		// Non-primary stores (e.g. the __dbis__ metadata DBI) must stay in records mode for v4-downgrade
+		// decodability, regardless of the global setting.
+		envMngr.setProperty(CONFIG_PARAMS.STORAGE_RANDOMACCESSFIELDS, true);
+		assert.strictEqual(new OpenDBIObject(false, false).randomAccessStructure, false);
+	});
+});