#3330. Add static extensions tests. Part 2. (#3382)

Add static extensions tests. Part 2.

Author: sgrekhov

LanguageFeatures/Static-extensions/static_member_A03_t01.dart

@@ -0,0 +1,68 @@
+// Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion Consider an expression `e` which is a member invocation with
+/// syntactic receiver `C` and an associated member name `m`. Assume that `m` is
+/// a static member declared by `D`. The static analysis and dynamic semantics
+/// of this expression is the same as in Dart before the introduction of this
+/// feature.
+///
+/// @description Checks that if `C` contains a static member with the basename
+/// `m` then it is not an error for extensions to declare a static member with
+/// the same basename. Invocation of `m` will invoke the `on` declaration member
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=static-extensions
+
+import '../../Utils/expect.dart';
+
+String log = "";
+
+class C {
+  static int foo = 42;
+}
+
+mixin M {
+  static int foo() => 42;
+}
+
+extension type ET(int _) {
+  static int get foo => 42;
+}
+
+enum E {
+  e0;
+  static void set foo(int v) {
+    log = "$v";
+  }
+}
+
+extension ExtC on C {
+  static String foo() => "ExtC";
+}
+
+extension ExtM on M {
+  static String foo() => "ExtM";
+}
+
+extension ExtET on ET {
+  static String foo() => "ExtET";
+}
+
+extension ExtE on E {
+  static String foo() => "ExtE";
+}
+
+main() {
+  Expect.equals(42, C.foo);
+  Expect.equals(42, M.foo());
+  Expect.equals(42, ET.foo);
+  E.foo = 42;
+  Expect.equals("42", log);
+
+  Expect.equals("ExtC", ExtC.foo());
+  Expect.equals("ExtM", ExtM.foo());
+  Expect.equals("ExtET", ExtET.foo());
+  Expect.equals("ExtE", ExtE.foo());
+}

LanguageFeatures/Static-extensions/static_member_A03_t02.dart

@@ -0,0 +1,70 @@
+// Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion Consider an expression `e` which is a member invocation with
+/// syntactic receiver `C` and an associated member name `m`. Assume that `m` is
+/// a static member declared by `D`. The static analysis and dynamic semantics
+/// of this expression is the same as in Dart before the introduction of this
+/// feature.
+///
+/// @description Checks that if `C` contains a static member with the basename
+/// `m` then it is not an error for extensions to declare a static member with
+/// the same basename. Invocation of `m` will invoke the `on` declaration member
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=static-extensions
+
+import '../../Utils/expect.dart';
+
+String log = "";
+
+class C {
+  int foo = 42;
+}
+
+mixin M {
+  int foo() => 42;
+}
+
+class MA = Object with M;
+
+extension type ET(int _) {
+  int get foo => 42;
+}
+
+enum E {
+  e0;
+  void set foo(int v) {
+    log = "$v";
+  }
+}
+
+extension ExtC on C {
+  static String foo() => "ExtC";
+}
+
+extension ExtM on M {
+  static String foo() => "ExtM";
+}
+
+extension ExtET on ET {
+  static String foo() => "ExtET";
+}
+
+extension ExtE on E {
+  static String foo() => "ExtE";
+}
+
+main() {
+  Expect.equals(42, C().foo);
+  Expect.equals(42, MA().foo());
+  Expect.equals(42, ET(0).foo);
+  E.e0.foo = 42;
+  Expect.equals("42", log);
+
+  Expect.equals("ExtC", ExtC.foo());
+  Expect.equals("ExtM", ExtM.foo());
+  Expect.equals("ExtET", ExtET.foo());
+  Expect.equals("ExtE", ExtE.foo());
+}

LanguageFeatures/Static-extensions/static_member_A04_t01.dart

@@ -0,0 +1,72 @@
+// Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion Consider an expression `e` which is a member invocation with
+/// syntactic receiver `C` and an associated member name `m`. Assume that `m` is
+/// a static member declared by `D`. The static analysis and dynamic semantics
+/// of this expression is the same as in Dart before the introduction of this
+/// feature.
+/// ...
+/// When `D` declares a static member whose basename is the basename of `m`, but
+/// `D` does not declare a static member named `m` or a constructor named `C.m`,
+/// a compile-time error occurs.
+///
+/// @description Checks that it is a compile-time error if `D` declares a static
+/// member whose basename is the basename of `m`, but `D` does not declare a
+/// member named `m`
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=static-extensions
+
+class C {
+  static final int foo = 42;
+}
+
+mixin M {
+  static int foo() => 42;
+}
+
+extension type ET(int _) {
+  static int get foo => 42;
+}
+
+enum E {
+  e0;
+  static int foo() => 42;
+}
+
+extension ExtC on C {
+  static void set foo(int _) {}
+}
+
+extension ExtM on M {
+  static void set foo(int _) {}
+}
+
+extension ExtET on ET {
+  static void set foo(int _) {}
+}
+
+extension ExtE on E {
+  static void set foo(int _) {}
+}
+
+main() {
+  C.foo = 42;
+//  ^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  M.foo = 42;
+//  ^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  ET.foo = 42;
+//   ^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  E.foo = 42;
+//  ^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+}

LanguageFeatures/Static-extensions/static_member_A04_t02.dart

@@ -0,0 +1,72 @@
+// Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion Consider an expression `e` which is a member invocation with
+/// syntactic receiver `C` and an associated member name `m`. Assume that `m` is
+/// a static member declared by `D`. The static analysis and dynamic semantics
+/// of this expression is the same as in Dart before the introduction of this
+/// feature.
+/// ...
+/// When `D` declares a static member whose basename is the basename of `m`, but
+/// `D` does not declare a static member named `m` or a constructor named `C.m`,
+/// a compile-time error occurs.
+///
+/// @description Checks that it is a compile-time error if `D` declares a static
+/// member whose basename is the basename of `m`, but `D` does not declare a
+/// member named `m`
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=static-extensions
+
+class C {
+  static void set foo(int _) {}
+}
+
+mixin M {
+  static void set foo(int _) {}
+}
+
+extension type ET(int _) {
+  static void set foo(int _) {}
+}
+
+enum E {
+  e0;
+  static void set foo(int _) {}
+}
+
+extension ExtC on C {
+  static final int foo = 42;
+}
+
+extension ExtM on M {
+  static int foo() => 42;
+}
+
+extension ExtET on ET {
+  static int get foo => 42;
+}
+
+extension ExtE on E {
+  static int get foo => 42;
+}
+
+main() {
+  C.foo;
+//  ^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  M.foo();
+//  ^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  ET.foo;
+//   ^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+  E.foo;
+//  ^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+}

LanguageFeatures/Static-extensions/static_member_A05_t01.dart

@@ -0,0 +1,58 @@
+// Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion Consider an expression `e` which is a member invocation with
+/// syntactic receiver `C` and an associated member name `m`. Assume that `m` is
+/// a static member declared by `D`. The static analysis and dynamic semantics
+/// of this expression is the same as in Dart before the introduction of this
+/// feature.
+/// ...
+/// Assume that it is an extension `E` that declares a static member named `m`.
+/// The invocation is then treated as `E.m()`.
+///
+/// @description Checks that invocation of `m` is then treated as `E.m()`. Test
+/// a static variable as `m`.
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=static-extensions
+
+import '../../Utils/expect.dart';
+
+class C {}
+
+mixin M {}
+
+extension type ET(int _) {}
+
+enum E {
+  e0;
+}
+
+extension ExtC on C {
+  static String foo = "ExtC";
+}
+
+extension ExtM on M {
+  static String foo = "ExtM";
+}
+
+extension ExtET on ET {
+  static String foo = "ExtET";
+}
+
+extension ExtE on E {
+  static String foo = "ExtE";
+}
+
+main() {
+  Expect.equals("ExtC", C.foo);
+  Expect.equals("ExtM", M.foo);
+  Expect.equals("ExtET", ET.foo);
+  Expect.equals("ExtE", E.foo);
+
+  Expect.equals("ExtC", ExtC.foo);
+  Expect.equals("ExtM", ExtM.foo);
+  Expect.equals("ExtET", ExtET.foo);
+  Expect.equals("ExtE", ExtE.foo);
+}