Simplify currentOS initialization (#1221)
The previous code was working around the possibility of getting a `null`
OS, that that is never returned. Instead `OperatingSystem.none` is used.
Since we can't hit the null branch and exception, the entire initializer
can simplify to the static method call. This will be more clearly
correct after the null safety migration.
diff --git a/pkgs/test_core/CHANGELOG.md b/pkgs/test_core/CHANGELOG.md
index 9b1e39b..d5cc250 100644
--- a/pkgs/test_core/CHANGELOG.md
+++ b/pkgs/test_core/CHANGELOG.md
@@ -1,3 +1,5 @@
+## 0.3.5-dev
+
## 0.3.4
* Fix error messages for incorrect string literals in test annotations.
diff --git a/pkgs/test_core/lib/src/util/io.dart b/pkgs/test_core/lib/src/util/io.dart
index c2cc3da..d2576dd 100644
--- a/pkgs/test_core/lib/src/util/io.dart
+++ b/pkgs/test_core/lib/src/util/io.dart
@@ -39,14 +39,8 @@
/// The root directory of the Dart SDK.
final String sdkDir = p.dirname(p.dirname(Platform.resolvedExecutable));
-/// Returns the current operating system.
-final OperatingSystem currentOS = (() {
- var name = Platform.operatingSystem;
- var os = OperatingSystem.findByIoName(name);
- if (os != null) return os;
-
- throw UnsupportedError('Unsupported operating system "$name".');
-})();
+/// The current operating system.
+final currentOS = OperatingSystem.findByIoName(Platform.operatingSystem);
/// Returns a [SuitePlatform] with the given [runtime], and with [os] and
/// [inGoogle] determined automatically.
diff --git a/pkgs/test_core/pubspec.yaml b/pkgs/test_core/pubspec.yaml
index 6aa2ef9..ec7e96e 100644
--- a/pkgs/test_core/pubspec.yaml
+++ b/pkgs/test_core/pubspec.yaml
@@ -1,5 +1,5 @@
name: test_core
-version: 0.3.4
+version: 0.3.5-dev
description: A basic library for writing tests and running them on the VM.
homepage: https://github.com/dart-lang/test/blob/master/pkgs/test_core
