Fix Ajv validation warning (#576)

* Fix Ajv validation warning

* Add test

ext/data/schemas/dictionary-term-bank-v3-schema.json

@@ -539,6 +539,8 @@
                         {
                             "type": "array",
                             "description": "Deinflection of the term to an uninflected term.",
+                            "minItems": 2,
+                            "maxItems": 2,
                             "items": [
                                 {
                                     "type": "string",

test/ajv-schemas.test.js

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2024  Yomitan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import Ajv from 'ajv';
+import standaloneCode from 'ajv/dist/standalone/index.js';
+import {readFileSync, readdirSync} from 'fs';
+import {dirname, join} from 'path';
+import {fileURLToPath} from 'url';
+import {describe, test} from 'vitest';
+import {parseJson} from '../dev/json.js';
+
+/**
+ * @param {string} path
+ * @returns {import('ajv').AnySchema}
+ */
+function loadSchema(path) {
+    return parseJson(readFileSync(path, {encoding: 'utf8'}));
+}
+
+const extDir = join(dirname(fileURLToPath(import.meta.url)), '..', 'ext');
+
+describe('Ajv schema compilation', () => {
+    const schemaDir = join(extDir, 'data/schemas/');
+    const schemaFileNames = readdirSync(schemaDir);
+    /** @type {{name: string, schema: import('ajv').AnySchema}[]} */
+    const schemaTestCases = [];
+    for (const schemaFileName of schemaFileNames) {
+        schemaTestCases.push({name: schemaFileName, schema: loadSchema(join(schemaDir, schemaFileName))});
+    }
+
+    describe.each(schemaTestCases)('Validating $name', ({schema}) => {
+        test('Compiles without warnings', ({expect}) => {
+            /** @type {string[]} */
+            const messages = [];
+            /**
+             * @param {...unknown} args
+             */
+            const log = (...args) => {
+                messages.push(args.join(' '));
+            };
+            const ajv = new Ajv({
+                schemas: [schema],
+                code: {source: true, esm: true},
+                allowUnionTypes: true,
+                logger: {
+                    log,
+                    warn: log,
+                    error: log
+                }
+            });
+            standaloneCode(ajv);
+            if (messages.length > 0) {
+                expect.fail(messages.join('\n'));
+            }
+        });
+    });
+});