-Fixes godot-rust#138.

-Add integration tests.

godot-core/src/builtin/meta/signature.rs

@@ -162,8 +162,9 @@ macro_rules! impl_signature_for_tuple {
 				unsafe { <$R as sys::GodotFuncMarshal>::try_write_sys(&ret_val, ret) }
                     .unwrap_or_else(|e| return_error::<$R>(method_name, &e));
 
-                // FIXME is inc_ref needed here?
-				// std::mem::forget(ret_val);
+               //Note: we want to prevent the destructor from being run, since we pass ownership to the caller.
+                // For details look at https://github.com/godot-rust/gdext/pull/165
+				std::mem::forget(ret_val);
             }
         }
     };

itest/godot/InheritTests.gd

@@ -0,0 +1,41 @@
+extends ArrayTest
+
+var _assertion_failed: bool = false
+
+## Asserts that `what` is `true`, but does not abort the test. Returns `what` so you can return
+## early from the test function if the assertion failed.
+func assert_that(what: bool, message: String = "") -> bool:
+	if what:
+		return true
+
+	_assertion_failed = true
+	if message:
+		print("assertion failed: %s" % message)
+	else:
+		print("assertion failed")
+	return false
+
+func assert_eq(left, right, message: String = "") -> bool:
+	if left == right:
+		return true
+
+	_assertion_failed = true
+	if message:
+		print("assertion failed: %s\n  left: %s\n right: %s" % [message, left, right])
+	else:
+		print("assertion failed: `(left == right)`\n  left: %s\n right: %s" % [left, right])
+	return false
+
+
+
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	pass
+
+func test_vector_array_return_from_user_func():
+	var array: Array = return_typed_array(2)
+	assert_eq(array, [1,2])
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta):
+	pass

itest/godot/TestRunner.gd

@@ -10,6 +10,7 @@ func _ready():
 	var gdscript_suites: Array = [
 		preload("res://ManualFfiTests.gd").new(),
 		preload("res://gen/GenFfiTests.gd").new(),
+		preload("res://InheritTests.gd").new()
 	]
 
 	var gdscript_tests: Array = []