1 files changed, 102 insertions, 0 deletions
diff --git a/modules/gdscript/tests/scripts/runtime/features/argument_count.gd b/modules/gdscript/tests/scripts/runtime/features/argument_count.gd
new file mode 100644
index 0000000000..c67ce25cbe
--- /dev/null
+++ b/modules/gdscript/tests/scripts/runtime/features/argument_count.gd
@@ -0,0 +1,102 @@
+extends Node
+
+func my_func_1(_foo, _bar):
+    pass
+
+func my_func_2(_foo, _bar, _baz):
+    pass
+
+static func my_static_func_1(_foo, _bar):
+    pass
+
+static func my_static_func_2(_foo, _bar, _baz):
+    pass
+
+@rpc
+func my_rpc_func_1(_foo, _bar):
+    pass
+
+@rpc
+func my_rpc_func_2(_foo, _bar, _baz):
+    pass
+
+func test():
+    # Test built-in methods.
+    var builtin_callable_1 : Callable = add_to_group
+    print(builtin_callable_1.get_argument_count()) # Should print 2.
+    var builtin_callable_2 : Callable = find_child
+    print(builtin_callable_2.get_argument_count()) # Should print 3.
+
+    # Test built-in vararg methods.
+    var builtin_vararg_callable_1 : Callable = call_thread_safe
+    print(builtin_vararg_callable_1.get_argument_count()) # Should print 1.
+    var builtin_vararg_callable_2 : Callable = rpc_id
+    print(builtin_vararg_callable_2.get_argument_count()) # Should print 2.
+
+    # Test plain methods.
+    var callable_1 : Callable = my_func_1
+    print(callable_1.get_argument_count()) # Should print 2.
+    var callable_2 : Callable = my_func_2
+    print(callable_2.get_argument_count()) # Should print 3.
+
+    # Test static methods.
+    var static_callable_1 : Callable = my_static_func_1
+    print(static_callable_1.get_argument_count()) # Should print 2.
+    var static_callable_2 : Callable = my_static_func_2
+    print(static_callable_2.get_argument_count()) # Should print 3.
+
+    # Test rpc methods.
+    var rpc_callable_1 : Callable = my_rpc_func_1
+    print(rpc_callable_1.get_argument_count()) # Should print 2.
+    var rpc_callable_2 : Callable = my_rpc_func_2
+    print(rpc_callable_2.get_argument_count()) # Should print 3.
+
+    # Test lambdas.
+    var lambda_callable_1 : Callable = func(_foo, _bar): pass
+    print(lambda_callable_1.get_argument_count()) # Should print 2.
+    var lambda_callable_2 : Callable = func(_foo, _bar, _baz): pass
+    print(lambda_callable_2.get_argument_count()) # Should print 3.
+
+    # Test lambas with self.
+    var lambda_self_callable_1 : Callable = func(_foo, _bar): return self
+    print(lambda_self_callable_1.get_argument_count()) # Should print 2.
+    var lambda_self_callable_2 : Callable = func(_foo, _bar, _baz): return self
+    print(lambda_self_callable_2.get_argument_count()) # Should print 3.
+
+    # Test bind.
+    var bind_callable_1 : Callable = my_func_2.bind(1)
+    print(bind_callable_1.get_argument_count()) # Should print 2.
+    var bind_callable_2 : Callable = my_func_2.bind(1, 2)
+    print(bind_callable_2.get_argument_count()) # Should print 1.
+
+    # Test unbind.
+    var unbind_callable_1 : Callable = my_func_2.unbind(1)
+    print(unbind_callable_1.get_argument_count()) # Should print 4.
+    var unbind_callable_2 : Callable = my_func_2.unbind(2)
+    print(unbind_callable_2.get_argument_count()) # Should print 5.
+
+    # Test variant callables.
+    var string_tmp := String()
+    var variant_callable_1 : Callable = string_tmp.replace
+    print(variant_callable_1.get_argument_count()) # Should print 2.
+    var variant_callable_2 : Callable = string_tmp.rsplit
+    print(variant_callable_2.get_argument_count()) # Should print 3.
+
+    # Test variant vararg callables.
+    var callable_tmp := Callable()
+    var variant_vararg_callable_1 : Callable = callable_tmp.call
+    print(variant_vararg_callable_1.get_argument_count()) # Should print 0.
+    var variant_vararg_callable_2 : Callable = callable_tmp.rpc_id
+    print(variant_vararg_callable_2.get_argument_count()) # Should print 1.
+
+    # Test global methods.
+    var global_callable_1 = is_equal_approx
+    print(global_callable_1.get_argument_count()) # Should print 2.
+    var global_callable_2 = inverse_lerp
+    print(global_callable_2.get_argument_count()) # Should print 3.
+
+    # Test GDScript methods.
+    var gdscript_callable_1 = char
+    print(gdscript_callable_1.get_argument_count()) # Should print 1.
+    var gdscript_callable_2 = is_instance_of
+    print(gdscript_callable_2.get_argument_count()) # Should print 2.