add a test script for user to take reference from

template/custom-handler-example/script.js

@@ -0,0 +1,98 @@
+import { File } from '@asyncapi/generator-react-sdk';
+
+export default function exampleCustomHandlerRegistrationScript() {
+    return <File name='script.js'>
+    {`
+// output refers to the generated template folder
+// You require the generated server. Running this code starts the server
+// App exposes API to send messages
+const { client } = require("../"); // library is in the current directory
+
+client.init(); // starts the app
+
+// Generated handlers that we use to react on consumer / produced messages are attached to the client
+// through which we can register middleware functions
+
+/**
+ * 
+ * 
+ * Example of how to process a message before it is sent to the broker
+ * 
+ * Modify the following in the function \`testPublish\` according to your usecase
+ * 1. channel / topic name
+ * 2. tool used to publish message according to the procotol used (amqp/mqtt/etc ...)
+ * 3. name of the invocated middleware function (based on operation Id)
+ */
+function testPublish() {
+    // mosquitto_sub -h test.mosquitto.org -p 1883 -t "smartylighting/streetlights/1/0/action/12/turn/on"
+
+    // Registering your custom logic in a channel-specific handler
+    // the passed handler function is called once the app sends a message to the channel
+    // For example \`client.app.send\` sends a message to some channel using and before it is sent, you want to perform some other actions
+    // in such a case, you can register middlewares like below
+    client.registerTurnOnMiddleware((message) => { // \`turnOn\` is the respective operationId
+        console.log("hitting the middleware before publishing the message");
+        console.log(
+            \`sending turn on message to streetlight \${message.params.streetlightId}\`,
+            message.payload
+        );
+    });
+
+    client.app.send(
+        { command: "off" },
+        {},
+        "smartylighting/streetlights/1/0/action/12/turn/on"
+    );
+}
+
+
+/**
+ *
+ * 
+ * Example of how to work with generated code as a consumer
+ * 
+ * Modify the following in the function \`testSubscribe\` according to your usecase
+ * 1. channel / topic name
+ * 2. tool used to publish message according to the procotol used (amqp/mqtt/etc ...)
+ * 3. name of the invocated middleware function (based on operation Id)
+ * 
+*/
+function testSubscribe() {
+    // mosquitto_pub -h test.mosquitto.org -p 1883 -t "smartylighting/streetlights/1/0/event/101/lighting/measured" -m '{"lumens": 10}'
+
+    // Writing your custom logic that should be triggered when your app receives as message from a given channel
+    // Registering your custom logic in a channel-specific handler
+    // the passed handler functions are called once the app gets message sent to the channel
+
+    client.registerReceiveLightMeasurementMiddleware((message) => { // \`recieveLightMeasurement\` is the respective operationId
+        console.log("recieved in middleware 1", message.payload);
+    });
+
+    client.registerReceiveLightMeasurementMiddleware((message) => {
+        console.log("recieved in middleware 2", message.payload);
+    });
+}
+
+testPublish();
+testSubscribe();
+
+/**
+ * 
+ * 
+ * Example of how to produce a message using API of generated app independently from the handlers
+ * Again, will have to modify the below according to your usecase:
+ * 1. payload
+ * 2. channel / topic name
+ * 
+*/
+
+(function myLoop (i) {
+  setTimeout(() => {
+    console.log('producing custom message');
+    client.app.send({percentage: 1}, {}, 'smartylighting/streetlights/1/0/action/1/turn/on');
+    if (--i) myLoop(i);
+  }, 1000);
+}(3));
+    `}
+    </File>;
+}

template/package.json.js

@@ -37,6 +37,9 @@ export default function packageFile({ asyncapi, params }) {
 
   packageJSON = {
     ...packageJSON,
+    scripts: {
+      'test': 'node custom-handler-example/script.js'
+    },
     main: './src/api',
     dependencies,
   };