Добавил тестовый скрипт persistent-подключения

tests/persistent.js

@@ -0,0 +1,31 @@
+const limestone = require('../limestone').SphinxClient();
+
+const testString = 'Punk';
+
+// 9312 is standard Sphinx port
+limestone.connect(9312, true, (connErr) => {
+  if (connErr) {
+    console.log(`Connection error: ${connErr.message}`);
+    console.log('Maybe Sphinx is not started or uses port different than 9312');
+    process.exit();
+  }
+
+  const query = (callback) => {
+    limestone.query({
+      query: 'Punk',
+      maxmatches: 1,
+      fieldweights: {
+        name: 80,
+        desc: 30,
+      },
+    }, callback);
+  };
+
+  query((firstErr, firstAnswer) => {
+    console.log(`First search for ${testString} yielded ${firstAnswer.match_count} results.`);
+    query((secondErr, secondAnswer) => {
+      console.log(`Second search for ${testString} yielded ${secondAnswer.match_count} results.`);
+      limestone.disconnect();
+    });
+  });
+});