Add test to verify pending block extraction

utils/e2e-tests/ts/tests/rpc/eth.ts

@@ -77,4 +77,39 @@ describe("eth rpc", () => {
       });
     });
   });
+
+  describe("pending block", () => {
+    it("should return pending block", async function () {
+      const [alice, bob] = devSigners;
+
+      var nonce = 0;
+      // Prepare and send transaction from alice increasing nonce value.
+      let sendTransaction = async () => {
+        const tx =
+        {
+          from: alice,
+          to: bob,
+          value: ethers.parseEther("1"),
+          nonce: nonce,
+        };
+        nonce = nonce + 1;
+        return (await alice.sendTransaction(tx));
+      };
+
+      // Send enough transactions number to have some pending.
+      const expectedXtsNumber = 10;
+      for (var _ of Array(expectedXtsNumber)) {
+        await sendTransaction();
+      }
+
+      // Get pending block.
+      const pending = await provider.send("eth_getBlockByNumber", ["pending", false]);
+      expect(pending.hash).to.be.null;
+      expect(pending.miner).to.be.null;
+      expect(pending.nonce).to.be.null;
+      expect(pending.totalDifficulty).to.be.null;
+      // Check that there are some pending transactions.
+      expect(pending.transactions.length).toBeGreaterThan(0);
+    });
+  });
 });