#2933. Add tests for Stream.error and Stream.value constructors.

LibTest/async/Stream/Stream.error_A01_t01.dart

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+// Copyright (c) 2024, 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 @Since("2.5")
+///   Stream<T>.error( Object error, [ StackTrace? stackTrace ])
+///
+/// Creates a stream which emits a single error event before completing.
+///
+/// This stream emits a single error event of `error` and `stackTrace` and then
+/// completes with a done event.
+///
+/// @description Checks that `Stream.error()` constructor creates a stream which
+/// emits a single error event before completing.
+/// @author sgrekhov22@gmail.com
+
+import "dart:async";
+import "../../../Utils/expect.dart";
+
+main() async {
+  Stream stream1 = Stream.error("Stream.error");
+  try {
+    await for (var x in stream1) {
+      Expect.fail("Unexpected event $x");
+    }
+  } catch (e) {
+    Expect.equals("Stream.error", e);
+  }
+
+  Stream stream2 = Stream.error("Stream.error");
+  try {
+    await stream2.isEmpty;
+    Expect.fail("Expected an error");
+  } catch (e) {
+    Expect.equals("Stream.error", e);
+  }
+}

LibTest/async/Stream/Stream.error_A01_t02.dart

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+// Copyright (c) 2024, 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 @Since("2.5")
+///   Stream<T>.error( Object error, [ StackTrace? stackTrace ])
+///
+/// Creates a stream which emits a single error event before completing.
+///
+/// This stream emits a single error event of `error` and `stackTrace` and then
+/// completes with a done event.
+///
+/// @description Checks that if `stackTrace` is specified it is available when a
+/// `catch` clause is executed to catch the error.
+/// @author sgrekhov22@gmail.com
+
+import "dart:async";
+import "../../../Utils/expect.dart";
+
+main() async {
+  StackTrace stackTrace = StackTrace.fromString("My StackTrace");
+  Stream stream = Stream.error("Stream.error", stackTrace);
+  try {
+    var v = await stream.first;
+    Expect.fail("Unexpected event $v");
+  } catch (e, st) {
+    Expect.equals("My StackTrace", st.toString());
+  }
+}

LibTest/async/Stream/Stream.error_A01_t03.dart

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+// Copyright (c) 2024, 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 @Since("2.5")
+///   Stream<T>.error( Object error, [ StackTrace? stackTrace ])
+///
+/// Creates a stream which emits a single error event before completing.
+///
+/// This stream emits a single error event of `error` and `stackTrace` and then
+/// completes with a done event.
+///
+/// @description Checks that the `Stream.error()` constructor creates a stream
+/// which emits a single error event and then calls 'onDone'.
+/// @author sgrekhov22@gmail.com
+
+import "dart:async";
+import "../../../Utils/expect.dart";
+
+main() {
+  var onErrors = 0;
+  asyncStart();
+  Stream stream = Stream.error("Stream.error");
+  stream.listen((v) {
+    Expect.fail("Unexpected event $v");
+  }, onError: (e) {
+    onErrors++;
+    Expect.equals("Stream.error", e);
+  }, onDone: () {
+    Expect.equals(onErrors, 1);
+    asyncEnd();
+  });
+}

LibTest/async/Stream/Stream.value_A01_t01.dart

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+// Copyright (c) 2024, 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 @Since("2.5")
+///   Stream<T>.value( T value )
+/// Creates a stream which emits a single data event before closing.
+///
+/// This stream emits a single data event of value and then closes with a done
+/// event.
+///
+/// @description Checks that the `Stream.value()` constructor creates a stream
+/// which emits a single data event before closing.
+/// @author sgrekhov22@gmail.com
+
+import "dart:async";
+import "../../../Utils/expect.dart";
+
+main() async {
+  var stream1 = Stream<String>.value("Stream.value");
+  var v = await stream1.first;
+  Expect.equals("Stream.value", v);
+
+  Stream stream2 = Stream.value("Stream.value");
+  var empty = await stream2.isEmpty;
+  Expect.isFalse(empty);
+}

LibTest/async/Stream/Stream.value_A01_t02.dart

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+// Copyright (c) 2024, 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 @Since("2.5")
+///   Stream<T>.value( T value )
+/// Creates a stream which emits a single data event before closing.
+///
+/// This stream emits a single data event of value and then closes with a done
+/// event.
+///
+/// @description Checks that the `Stream.value()` constructor creates a stream
+/// which emits a single data event before closing.
+/// @author sgrekhov22@gmail.com
+
+import "dart:async";
+import "../../../Utils/expect.dart";
+
+main() {
+  int counter = 0;
+  asyncStart();
+  Stream stream = Stream.value("Stream.value");
+  stream.listen((v) {
+    counter++;
+    Expect.equals("Stream.value", v);
+  }, onDone: () {
+    Expect.equals(1, counter);
+    asyncEnd();
+  });
+}