From f8d5060500fe46b323e49de9351097b331d45943 Mon Sep 17 00:00:00 2001
From: Adam Spiers <adam.spiers@blocko.io>
Date: Sun, 2 Feb 2020 17:19:20 +0000
Subject: [PATCH] add system.print()

This ensures that contracts using system.print won't break,
and that there is some mechanism for outputting to the logs
and STDOUT.  Test suites which wish to avoid this can stub
system.print, e.g.

    system.print = function(msg)
    end

or

    function stubPrint()
      system.origPrint = system.print
      system.print = function(msg)
        printOutput[#printOutput + 1] = msg
        -- We don't have the table library
        -- table.insert(printOutput, msg)
      end
    end

    function showPrintOutput()
      system.origPrint("captured:")
      for i, line in pairs(printOutput) do
        system.origPrint(line)
      end
      system.origPrint("--------")
    end

    function assertOutputContains(pattern)
      for i, line in pairs(printOutput) do
        if string.match(line, pattern) then
          return true
        end
      end
      error("Output did not contain '" .. pattern .. "'")
    end

    function resetOutputCapture()
      printOutput = {}
    end
---
 core/src/main/java/ship/test/AergoMock.java | 9 +++++++++
 core/src/main/java/ship/test/Athena.java    | 3 ++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/core/src/main/java/ship/test/AergoMock.java b/core/src/main/java/ship/test/AergoMock.java
index 9be5ebd..722138d 100644
--- a/core/src/main/java/ship/test/AergoMock.java
+++ b/core/src/main/java/ship/test/AergoMock.java
@@ -40,4 +40,13 @@ public LuaValue call(LuaValue name, LuaValue value) {
     }
   };
 
+  public OneArgFunction print = new OneArgFunction() {
+    @Override
+    public LuaValue call(LuaValue msg) {
+      System.out.println(msg.tojstring());
+      logger.info(msg.tojstring());
+      return NIL;
+    }
+  };
+
 }
diff --git a/core/src/main/java/ship/test/Athena.java b/core/src/main/java/ship/test/Athena.java
index 0e1bcf5..d97bf90 100644
--- a/core/src/main/java/ship/test/Athena.java
+++ b/core/src/main/java/ship/test/Athena.java
@@ -31,8 +31,9 @@ public LuaValue call(final LuaValue modname, final LuaValue env) {
     final LuaValue system = tableOf();
     system.set("getItem", aergoMock.getItem);
     system.set("setItem", aergoMock.setItem);
-
+    system.set("print", aergoMock.print);
     env.set("system", system);
+
     return library;
   }
 }