Ensure that mocked methods and functions without names provided are assigned names

Closes #6
Closes #7

Author: ryanplusplus

spec/mach_spec.lua

@@ -439,4 +439,16 @@ describe('The mach library', function()
       mach.mock_function('f')(a)
     end)
   end)
+
+  it('should give mocked functions a default name when none is provided', function()
+    should_fail_with('unexpected function call <anonymous>(1, 2, 3)', function()
+      mach.mock_function()(1, 2, 3)
+    end)
+  end)
+
+  it('should give mocked functions a default name when none is provided', function()
+    should_fail_with('unexpected function call <anonymous>(2, 3)', function()
+      mach.mock_method()(1, 2, 3)
+    end)
+  end)
 end)