From 442b3f54990c26ef94d5d824ddc1e92258326e7f Mon Sep 17 00:00:00 2001
From: furkanocalan <furkan.ocalan@huawei.com>
Date: Fri, 30 May 2025 10:43:55 +0300
Subject: [PATCH] Add and rewrite tests to cover method variance

Issue: #ICBOUO
Description: Added and re-written test cases to cover method variance for multiple overridde, multiple implements and default conflicts
Signed-off-by: furkanocalan <furkan.ocalan@huawei.com>
---
 ...method_overriding_conflict_no_override.ets | 21 +++++++++++++++++
 ...d_overriding_contravariant_return_type.ets | 23 +++++++++++++++++++
 ...ethod_overriding_duplicate_declaration.ets | 23 +++++++++++++++++++
 3 files changed, 67 insertions(+)
 create mode 100644 ets2panda/test/ast/compiler/ets/method_overriding_conflict_no_override.ets
 create mode 100644 ets2panda/test/ast/compiler/ets/method_overriding_contravariant_return_type.ets
 create mode 100644 ets2panda/test/ast/compiler/ets/method_overriding_duplicate_declaration.ets

diff --git a/ets2panda/test/ast/compiler/ets/method_overriding_conflict_no_override.ets b/ets2panda/test/ast/compiler/ets/method_overriding_conflict_no_override.ets
new file mode 100644
index 0000000000..ef1c14d8e3
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/method_overriding_conflict_no_override.ets
@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+interface L { foo(): string { return "L"; } }
+interface R { foo(): string { return "R"; } }
+
+class Bad implements L, R {}
+
+/* @@? 19:27 Error TypeError: Method 'foo' is declared in L and R interfaces. */
diff --git a/ets2panda/test/ast/compiler/ets/method_overriding_contravariant_return_type.ets b/ets2panda/test/ast/compiler/ets/method_overriding_contravariant_return_type.ets
new file mode 100644
index 0000000000..fe9ade6e62
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/method_overriding_contravariant_return_type.ets
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+interface Base { n(): int; }
+
+interface BadReturn extends Base {
+  n(): number;
+}
+
+/* @@? 19:4 Error TypeError: n(): double in BadReturn cannot override n(): int in Base because overriding return type is not compatible with the other return type. */
+/* @@? 19:4 Error TypeError: Method n(): double in BadReturn not overriding any method */
diff --git a/ets2panda/test/ast/compiler/ets/method_overriding_duplicate_declaration.ets b/ets2panda/test/ast/compiler/ets/method_overriding_duplicate_declaration.ets
new file mode 100644
index 0000000000..21d5ff0f03
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/method_overriding_duplicate_declaration.ets
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+interface I { foo(): void; }
+
+class Duplicate implements I {
+  foo(): void {}
+  foo(): void {}
+}
+
+/* @@? 20:3 Error TypeError: Function foo is already declared. */
-- 
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