Add demo for graph-watcher IPLD statediff and checkpointing

packages/graph-node/test/tasks/example-test.ts

@@ -0,0 +1,31 @@
+//
+// Copyright 2022 Vulcanize, Inc.
+//
+
+import { task, types } from 'hardhat/config';
+import '@nomiclabs/hardhat-ethers';
+import { ContractTransaction } from 'ethers';
+
+task('example-test', 'Trigger Test event')
+  .addParam('address', 'Contract address', undefined, types.string)
+  .setAction(async (args, hre) => {
+    const { address } = args;
+    await hre.run('compile');
+    const Example = await hre.ethers.getContractFactory('Example');
+    const example = Example.attach(address);
+
+    const transaction: ContractTransaction = await example.emitEvent();
+
+    const receipt = await transaction.wait();
+
+    if (receipt.events) {
+      const TestEvent = receipt.events.find(el => el.event === 'Test');
+
+      if (TestEvent && TestEvent.args) {
+        console.log('Test Event');
+        console.log('param1:', TestEvent.args.param1.toString());
+        console.log('param2:', TestEvent.args.param2.toString());
+        console.log('param3:', TestEvent.args.param3.toString());
+      }
+    }
+  });