tests: add detour code test

Author: gynt

tests/test-detour-code.lua

@@ -0,0 +1,24 @@
+local lunatest = require("tests.lunatest.lunatest")
+local rps = require("RPS")
+
+local test_detour_code = {}
+
+function test_detour_code.test_detourCode()
+  local func1_code = { 0xB8, 0x02, 0x00, 0x00, 0x00, 0xBA, 0x03, 0x00, 0x00, 0x00, 0x0F, 0xAF, 0xC2, 0xC3 }
+  local func1_address = rps.allocateCode(#func1_code)
+  rps.writeCode(func1_address, func1_code)
+
+  local func1 = rps.exposeCode(func1_address, 0, 0) -- this call with 3 arguments
+
+  lunatest.assert_equal(6, func1())
+
+  rps.detourCode(function(registers)
+    registers.EAX = 100
+    return registers
+  end, func1_address + 5, 5)
+
+  lunatest.assert_equal(300, func1())
+
+end
+
+return test_detour_code