test: add e2e for debug_traceBlockByNumber

e2e-tests/test/debug-apis.test.ts

@@ -134,4 +134,28 @@ describe("debug namespace", function () {
     const trace = traces[0].result;
     expect(trace.input).to.equal(txReceipt.data);
   });
+
+  it("debug_traceBlockByNumber should trace prior blocks", async function () {
+    const wallet = new Wallet(RichAccounts[0].PrivateKey);
+    const deployer = new Deployer(hre, wallet);
+
+    const greeter = await deployContract(deployer, "Greeter", ["Hi"]);
+
+    const txReceipt = await greeter.setGreeting("Luke Skywalker");
+
+    // latest block will be empty, check we get no traces for it
+    const empty_traces = await provider.send("debug_traceBlockByNumber", ["latest"]);
+    expect(empty_traces.length).to.equal(0);
+
+    // latest - 1 should contain our traces
+    const latestBlock = await provider.getBlock("latest");
+    const traces = await provider.send("debug_traceBlockByNumber", [(latestBlock.number - 1).toString(16)]);
+
+    // block should have 1 traces
+    expect(traces.length).to.equal(1);
+
+    // should contain trace for our tx
+    const trace = traces[0].result;
+    expect(trace.input).to.equal(txReceipt.data);
+  });
 });