#199 Improves ethers.js test with more logging and better assertions.

truffle/test/07_ethers.js

@@ -5,21 +5,22 @@ const HelloBlockchainWorld = artifacts.require("HelloBlockchainWorld");
 describe('Ethers', () => {
   let ROOT_ACCOUNT = extractEnvAccountAndPwd(process.env.NETWORK).from;
   let helloWorldInstance;
+  let incrementHelloCountTx;
 
   it("should emit an event in a SC", async () => {
     helloWorldInstance = await HelloBlockchainWorld.deployed();
 
     const estimatedGas = await helloWorldInstance.incrementHelloCount.estimateGas();
-    const tx = await helloWorldInstance.incrementHelloCount({
+    incrementHelloCountTx = await helloWorldInstance.incrementHelloCount({
       from: ROOT_ACCOUNT,
       gasLimit: estimatedGas,
     });
 
-    const emitedEvent = tx.receipt.logs[0];
+    const emitedEvent = incrementHelloCountTx.receipt.logs[0];
 
-    assert.equal(tx.receipt.status, "0x1", "successful TX status expected");
+    assert.equal(incrementHelloCountTx.receipt.status, "0x1", "successful TX status expected");
     assert.equal(emitedEvent.event, "HelloCountIncremented");
-    assert.equal(emitedEvent.blockHash, tx.receipt.blockHash);
+    assert.equal(emitedEvent.blockHash, incrementHelloCountTx.receipt.blockHash);
   });
 
   it("should be able to query emitted event logs", async () => {
@@ -29,12 +30,19 @@ describe('Ethers', () => {
 
     const jsonRpcProvider = new providers.JsonRpcProvider(host);
 
+    const latestBlock = await jsonRpcProvider.getBlockNumber();
+
     const events = await jsonRpcProvider.getLogs({
-      fromBlock: 0,
-      address: helloWorldInstance.address
+      fromBlock: latestBlock - 100,
+      address: helloWorldInstance.address,
+      topics: [incrementHelloCountTx.receipt.rawLogs[0].topics[0]],
     });
 
+    console.log(events);
+
+    assert.equal(events[0].blockNumber, incrementHelloCountTx.receipt.blockNumber);
     assert.equal(events[0].address, helloWorldInstance.address);
     assert.equal(events[0].topics.length, 1);
+    assert.equal(events[0].topics[0], incrementHelloCountTx.receipt.rawLogs[0].topics[0]);
   });
 });