add pagination test

apps/explorer/test/explorer/etherscan/logs_test.exs

@@ -158,6 +158,46 @@ defmodule Explorer.Etherscan.LogsTest do
       assert found_log.transaction_hash == transaction_block1.hash
     end
 
+    test "paginates logs" do
+      contract_address = insert(:contract_address)
+
+      transaction =
+        %Transaction{block: block} =
+        :transaction
+        |> insert(to_address: contract_address)
+        |> with_block()
+
+      inserted_records = insert_list(2000, :log, address: contract_address, transaction: transaction)
+
+      filter = %{
+        from_block: block.number,
+        to_block: block.number,
+        address_hash: contract_address.hash
+      }
+
+      first_found_logs = Logs.list_logs(filter)
+
+      assert Enum.count(first_found_logs) == 1_000
+
+      last_record = List.last(first_found_logs)
+
+      next_page_params = %{
+        log_index: last_record.index,
+        transaction_index: last_record.transaction_index,
+        block_number: transaction.block_number
+      }
+
+      second_found_logs = Logs.list_logs(filter, next_page_params)
+
+      assert Enum.count(second_found_logs) == 1_000
+
+      all_found_logs = first_found_logs ++ second_found_logs
+
+      Enum.all?(inserted_records, fn record ->
+        Enum.any?(all_found_logs, fn found_log -> found_log.index == record.index end)
+      end)
+    end
+
     test "with a valid topic{x}" do
       contract_address = insert(:contract_address)