Fancied up unexpected arguments error a bit

Author: ryanplusplus

mock.lua

@@ -117,7 +117,7 @@ function MockExpectation:when(thunk)
     if not validFunctionFound then
       error('unexpected function call ' .. name .. '(' .. table.concat(args, ', ') .. ')', 2)
     else
-      error('unexpected arguments provided to function ' .. name, 2)
+      error('unexpected arguments (' .. table.concat(args, ', ') .. ') provided to function ' .. name, 2)
     end
   end
 

spec/mock_spec.lua

@@ -342,7 +342,7 @@ describe('The mock library', function()
       end)
     end)
 
-    shouldFailWith('unexpected arguments provided to function f1', function()
+    shouldFailWith('unexpected arguments (2) provided to function f1', function()
       mock(f1):shouldBeCalledWith(1):
       andThen(mock(f2):shouldBeCalled(2)):
       when(function()