Support @Skip as a suite-level annotation.

lib/src/runner/parse_metadata.dart

Index: lib/src/runner/parse_metadata.dart
diff --git a/lib/src/runner/parse_metadata.dart b/lib/src/runner/parse_metadata.dart
index 5cc4cb61039b3fa19277c68dc193ba882eff2a7f..21ed6e2cbd954fc71812c324522a6a34007b10c8 100644
--- a/lib/src/runner/parse_metadata.dart
+++ b/lib/src/runner/parse_metadata.dart
@@ -32,6 +32,7 @@ const _durationArgs = const [
 Metadata parseMetadata(String path) {
   var timeout;
   var testOn;
+  var skip;
 
   var contents = new File(path).readAsStringSync();
   var directives = parseDirectives(contents, name: path).directives;
@@ -82,13 +83,21 @@ Metadata parseMetadata(String path) {
             _spanFor(annotation, path));
       }
       timeout = _parseTimeout(annotation, constructorName, path);
+    } else if (name == 'Skip') {
+      if (skip != null) {
+        throw new SourceSpanFormatException(
+            "Only a single Skip annotation may be used for a given test file.",
+            _spanFor(annotation, path));
+      }
+      skip = _parseSkip(annotation, constructorName, path);
     }
   }
 
   try {
     return new Metadata.parse(
         testOn: testOn == null ? null : testOn.stringValue,
-        timeout: timeout);
+        timeout: timeout,
+        skip: skip);
   } on SourceSpanFormatException catch (error) {
     var file = new SourceFile(new File(path).readAsStringSync(),
         url: p.toUri(path));
@@ -188,6 +197,47 @@ Timeout _parseTimeout(Annotation annotation, String constructorName,
   }
 }
 
+/// Parses a `@Skip` annotation.
+///
+/// [annotation] is the annotation. [constructorName] is the name of the named
+/// constructor for the annotation, if any. [path] is the path to the file from
+/// which the annotation was parsed.
+///
+/// Returns either `true` or a reason string.
+_parseSkip(Annotation annotation, String constructorName, String path) {
+  if (constructorName != null) {
+    throw new SourceSpanFormatException(
+        'Skip doesn\'t have a constructor named "$constructorName".',
+        _spanFor(annotation, path));
+  }
+
+  if (annotation.arguments == null) {
+    throw new SourceSpanFormatException(
+        'Skip must have parentheses.', _spanFor(annotation, path));
+  }
+
+  var args = annotation.arguments.arguments;
+  if (args.length > 1) {
+    throw new SourceSpanFormatException(
+        'Skip takes zero arguments or one argument.',
+        _spanFor(annotation.arguments, path));
+  }
+
+  if (args.isEmpty) return true;
+
+  if (args.first is NamedExpression) {
+    throw new SourceSpanFormatException(
+        "Skip doesn't take named parameters.", _spanFor(args.first, path));
+  }
+
+  if (args.first is! StringLiteral) {
+    throw new SourceSpanFormatException(
+        "Skip takes a String.", _spanFor(args.first, path));
+  }
+
+  return args.first.stringValue;
+}
+
 /// Parses a `const Duration` expression.
 Duration _parseDuration(Expression expression, String path) {
   if (expression is! InstanceCreationExpression) {