#2420. Add extension types exhaustiveness tests. Enums, trivial cases

LanguageFeatures/Extension-types/exhaustiveness_enum_A01_t04.dart

@@ -0,0 +1,71 @@
+// Copyright (c) 2023, 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 Switch statements and expressions with enum as a matched type are
+/// always exhaustive
+///
+/// @description Check that it is no compile-time error if a matched type of a
+/// switch expression is an extension type with an enum as a representation type
+/// and the set of cases is exhaustive
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=inline-class
+
+import "../../Utils/expect.dart";
+
+enum E {
+  a, b, c
+}
+
+extension type ET1(E _) {}
+extension type ET2(E _) implements E {}
+
+String testStatement1(ET1 e) {
+  switch (e) {
+    case E.a:
+    case E.b:
+    case E.c:
+      return "ok";
+  }
+}
+
+String testStatement2(ET2 e) {
+  switch (e) {
+    case E.a:
+    case E.b:
+      return "ok1";
+    case E.c:
+      return "ok2";
+  }
+}
+
+String testExpression1(ET1 e) =>
+  switch (e) {
+    E.a => "a",
+    E.b => "b",
+    E.c => "c"
+  };
+
+String testExpression2(ET2<num> e) =>
+  switch (e) {
+    E.a => "a",
+    E.b => "b",
+    E.c => "c"
+  };
+
+main() {
+  Expect.equals("ok", testStatement1(ET1(E.a)));
+  Expect.equals("ok", testStatement1(ET1(E.b)));
+  Expect.equals("ok", testStatement1(ET1(E.c)));
+  Expect.equals("a", testExpression1(ET1(E.a)));
+  Expect.equals("a", testExpression1(ET1(E.b)));
+  Expect.equals("c", testExpression1(ET1(E.c)));
+
+  Expect.equals("ok1", testStatement2(ET2(E.a)));
+  Expect.equals("ok1", testStatement2(ET2(E.b)));
+  Expect.equals("ok2", testStatement2(ET2(E.c)));
+  Expect.equals("a", testExpression2(ET2(E.a)));
+  Expect.equals("b", testExpression2(ET2(E.b)));
+  Expect.equals("c", testExpression2(ET2(E.c)));
+}

LanguageFeatures/Extension-types/exhaustiveness_enum_A01_t05.dart

@@ -0,0 +1,56 @@
+// Copyright (c) 2023, 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 Switch statements and expressions with enum as a matched type are
+/// always exhaustive
+///
+/// @description Check that it is no compile-time error if a matched type of a
+/// switch expression is an extension type with an enum as a representation type
+/// and the set of cases is exhaustive
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=inline-class
+
+import "../../Utils/expect.dart";
+
+enum E {
+  a, b, c
+}
+
+extension type ET1(E _) {}
+extension type ET2(E _) implements E {}
+
+String testStatement1(ET1 e) {
+  switch (e) {
+    case E.a || E.b || E.c:
+      return "ok";
+  }
+}
+
+String testStatement2(ET2 e) {
+  switch (e) {
+    case E.a || E.b || E.c:
+      return "ok";
+  }
+}
+
+String testExpression1(ET1 e) =>
+  switch (e) {
+    E.a || E.b || E.c => "ok"
+  };
+
+String testExpression2(ET2 e) =>
+  switch (e) {
+    E.a || E.b || E.c => "ok"
+  };
+
+main() {
+  Expect.equals("ok", testStatement1(ET1(E.a)));
+  Expect.equals("ok", testStatement1(ET1(E.b)));
+  Expect.equals("ok", testStatement1(ET1(E.c)));
+
+  Expect.equals("ok", testStatement2(ET2(E.a)));
+  Expect.equals("ok", testStatement2(ET2(E.b)));
+  Expect.equals("ok", testStatement2(ET2(E.c)));
+}

LanguageFeatures/Extension-types/exhaustiveness_enum_A02_t01.dart

@@ -56,9 +56,9 @@ String testExpression1<T extends num>(ET1<T> e) =>
 
 String testExpression2<T extends num>(ET2<T> e) =>
   switch (e) {
-  //^^^^^^
-  // [analyzer] unspecified
-  // [cfe] unspecified
+//^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
     E.a => "a",
     E.b => "b"
   };

LanguageFeatures/Extension-types/exhaustiveness_enum_A02_t02.dart

@@ -0,0 +1,69 @@
+// Copyright (c) 2023, 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 Switch statements and expressions with enum as a matched type are
+/// always exhaustive
+///
+/// @description Check that it is a compile-time error if a matched type of a
+/// switch expression is an extension type with an enum as a representation type
+/// and the set of cases is not exhaustive
+/// @author [email protected]
+
+// SharedOptions=--enable-experiment=inline-class
+
+enum E {
+  a, b, c
+}
+
+extension type ET1(E _) {}
+extension type ET2(E _) implements E {}
+
+String testStatement1(ET1 e) {
+  switch (e) {
+//^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+    case E.a:
+      return "a";
+    case E.b:
+      return "b";
+  }
+}
+
+String testStatement2(ET2 e) {
+  switch (e) {
+//^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+    case E.a:
+      return "a";
+    case E.b:
+      return "b";
+  }
+}
+
+String testExpression1(ET1 e) =>
+  switch (e) {
+//^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+      E.a => "a",
+      E.b => "b"
+    };
+
+String testExpression2(ET2 e) =>
+  switch (e) {
+//^^^^^^
+// [analyzer] unspecified
+// [cfe] unspecified
+    E.a => "a",
+    E.b => "b"
+  };
+
+main() {
+  testStatement1(ET1(E.a));
+  testStatement2(ET2(E.a));
+  testExpression1(ET1(E.c));
+  testExpression2(ET2(E.c));
+}