fix contract validation

fix tx_to_json, now encodes content as expected

lib/archethic/contracts.ex

@@ -75,8 +75,11 @@ defmodule Archethic.Contracts do
       when code != "" do
     # only contract without triggers (with only conditions) are allowed to NOT have a Contract.Context
     case from_transaction(prev_tx) do
-      {:ok, %Contract{triggers: %{}}} -> true
-      _ -> false
+      {:ok, %Contract{triggers: triggers}} when map_size(triggers) == 0 ->
+        true
+
+      _ ->
+        false
     end
   end
 

lib/archethic/utils/regression/playbook.ex

@@ -376,7 +376,7 @@ defmodule Archethic.Utils.Regression.Playbook do
           }
         },
         "code" => code,
-        "content" => content,
+        "content" => Base.encode16(content),
         "recipients" => Enum.map(recipients, &Base.encode16(&1)),
         "ownerships" =>
           Enum.map(ownerships, fn %Ownership{

test/archethic/contracts_test.exs

@@ -219,7 +219,7 @@ defmodule Archethic.ContractsTest do
       """
 
       prev_tx = %Transaction{
-        address: ArchethicCase.random_address(),
+        address: random_address(),
         type: :contract,
         data: %TransactionData{
           code: code
@@ -235,7 +235,7 @@ defmodule Archethic.ContractsTest do
         }
       }
 
-      assert Contracts.valid_execution?(prev_tx, next_tx, nil)
+      refute Contracts.valid_execution?(prev_tx, next_tx, nil)
     end
 
     test "should return true if there is no context and there is no trigger" do
@@ -245,7 +245,7 @@ defmodule Archethic.ContractsTest do
       """
 
       prev_tx = %Transaction{
-        address: ArchethicCase.random_address(),
+        address: random_address(),
         type: :oracle,
         data: %TransactionData{
           code: code
@@ -275,7 +275,7 @@ defmodule Archethic.ContractsTest do
       """
 
       prev_tx = %Transaction{
-        address: ArchethicCase.random_address(),
+        address: random_address(),
         type: :contract,
         data: %TransactionData{
           code: code