test: add UNION ALL conversion test

Author: 爪子

tests/union.test.js

@@ -0,0 +1,13 @@
+const wasm = require('../node_modules/sqlparser-rs-wasm');
+const Converter = require('../src/converter');
+
+test('union all for users where null', () => {
+  const sql = "(select * from `users` where `last_name` is null) union all (select * from `users` where `first_name` is null) order by id";
+  const ast = wasm.parse_sql('--mysql', sql);
+  const conv = new Converter(ast, null);
+  const out = conv.run(true);
+
+  const expected = `DB::table('users')\n->whereNull('last_name')\n->unionAll(\n DB::table('users')\n ->whereNull('first_name')\n)\n->orderBy('id')\n->get();`;
+
+  expect(out.replace(/\s+$/g, '')).toBe(expected);
+});