Disable certain tests, which rely on Godot checks in Release mode

itest/godot/ManualFfiTests.gd

@@ -253,13 +253,19 @@ func test_custom_property():
 	assert_eq(d.b, 33)
 
 func test_custom_property_wrong_values_1():
+	if runs_release():
+		return
+
 	var has_property: HasCustomProperty = HasCustomProperty.new()
 	disable_error_messages()
 	has_property.some_c_style_enum = 10 # Should fail.
 	enable_error_messages()
 	assert_fail("HasCustomProperty.some_c_style_enum should only accept integers in the range `(0 ..= 2)`")
 
 func test_custom_property_wrong_values_2():
+	if runs_release():
+		return
+
 	var has_property: HasCustomProperty = HasCustomProperty.new()
 	disable_error_messages()
 	has_property.not_exportable = {"a": "hello", "b": Callable()}  # Should fail.

itest/godot/TestSuite.gd

@@ -66,3 +66,8 @@ func assert_fail(message: String = "") -> bool:
 		print_error("Test execution should have failed")
 
 	return false
+
+## Some tests are disabled, as they rely on Godot checks which are only available in Debug builds.
+## See https://github.com/godotengine/godot/issues/86264.
+static func runs_release() -> bool:
+	return !OS.is_debug_build()

itest/rust/src/builtin_tests/containers/variant_test.rs

@@ -16,7 +16,7 @@ use godot::obj::InstanceId;
 use godot::sys::GodotFfi;
 
 use crate::common::roundtrip;
-use crate::framework::{expect_panic, itest};
+use crate::framework::{expect_panic, itest, runs_release};
 
 const TEST_BASIS: Basis = Basis::from_rows(
     Vector3::new(1.0, 2.0, 3.0),
@@ -146,16 +146,18 @@ fn variant_call() {
     let result = vector.to_variant().call("dot", &[vector_rhs.to_variant()]);
     assert_eq!(result, 2.0.to_variant());
 
-    // Error cases
-    expect_panic("Variant::call on non-existent method", || {
-        variant.call("gut_position", &[]);
-    });
-    expect_panic("Variant::call with bad signature", || {
-        variant.call("set_position", &[]);
-    });
-    expect_panic("Variant::call with non-object variant (int)", || {
-        Variant::from(77).call("to_string", &[]);
-    });
+    // Dynamic checks are only available in Debug builds.
+    if !runs_release() {
+        expect_panic("Variant::call on non-existent method", || {
+            variant.call("gut_position", &[]);
+        });
+        expect_panic("Variant::call with bad signature", || {
+            variant.call("set_position", &[]);
+        });
+        expect_panic("Variant::call with non-object variant (int)", || {
+            Variant::from(77).call("to_string", &[]);
+        });
+    }
 
     node2d.free();
 }

itest/rust/src/framework/mod.rs

@@ -5,7 +5,7 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
 
-use godot::engine::{Engine, Node};
+use godot::engine::{Engine, Node, Os};
 use godot::obj::Gd;
 use godot::sys;
 use std::collections::HashSet;
@@ -128,3 +128,9 @@ pub fn suppress_godot_print(mut f: impl FnMut()) {
     f();
     Engine::singleton().set_print_error_messages(true);
 }
+
+/// Some tests are disabled, as they rely on Godot checks which are only available in Debug builds.
+/// See https://github.com/godotengine/godot/issues/86264.
+pub fn runs_release() -> bool {
+    !Os::singleton().is_debug_build()
+}