Add class unregistration test.

README.md

@@ -6,6 +6,8 @@ ____/ \___| _| \___| _| _| \___|
 
 Simple C++11 friendly bindings to Lua.
 
+![Lua logo](http://www.lua.org/images/lua-logo.gif)
+
 ## Building
 
 The project requires Cmake > v2.8.11 although an older Cmake is likely
@@ -104,6 +106,9 @@ assert(result == 10);
 You can also register functor objects, lambdas, and any fully
 qualified `std::function`. See `test/interop_tests.h` for details.
 
+If we no longer want a function to be accessible, we can unregister it
+with `state.Unregister("c_multiply")` for example.
+
 ### Registering Object Instances
 
 ```c++
@@ -131,6 +136,9 @@ assert(foo.x == 4);
 
 int result = state.CallField("foo", "double_add", 3);
 assert(result == 14);
+
+// If foo goes out of scope, we need to unregister it
+state.Unregister("foo");
 ```
 
 In the above example, the functions `foo.double_add` and `foo.set_x`

test/Test.cpp

@@ -22,7 +22,8 @@ static std::vector<bool(*)()> tests = {
     test_c_fun_destructor,
     test_register_class,
     test_mutate_instance,
-    test_multiple_methods
+    test_multiple_methods,
+    test_unregister_instance
 };
 
 

test/class_tests.h

@@ -44,3 +44,15 @@ bool test_multiple_methods() {
     const int answer = state.CallField<int>("foo_instance", "double_add", 3);
     return (answer == 14);
 }
+
+bool test_unregister_instance() {
+    Foo foo_instance(1);
+    sel::State state;
+    state.Register("foo_instance",
+                   foo_instance,
+                   std::make_pair("double_add", &Foo::DoubleAdd),
+                   std::make_pair("set_x", &Foo::SetX));
+    bool exists = !state.CheckNil("foo_instance");
+    state.Unregister("foo_instance");
+    return exists && state.CheckNil("foo_instance");
+}