Roll Observatory packages and add a roll script

packages/which/test/is_executable_test.dart

Index: packages/which/test/is_executable_test.dart
diff --git a/packages/which/test/is_executable_test.dart b/packages/which/test/is_executable_test.dart
new file mode 100755
index 0000000000000000000000000000000000000000..788c41434865844769e3efe1f7c808fb79a13a5e
--- /dev/null
+++ b/packages/which/test/is_executable_test.dart
@@ -0,0 +1,74 @@
+
+library which.test.is_executable;
+
+import 'dart:io';
+
+import 'package:mockito/mockito.dart';
+import 'package:unittest/unittest.dart';
+import 'package:which/src/is_executable.dart';
+
+import 'util.dart';
+
+main() {
+  group('isExecutableStat', () {
+    test('false if not a file', () {
+
+      var stat = new MockFileStat();
+
+      // A directory.
+      when(stat.type).thenReturn(FileSystemEntityType.DIRECTORY);
+
+      var result = isExecutableStat(stat, false);
+
+      expect(result, isFalse);
+
+      verifyNever(stat.mode);
+    });
+
+    test('true for all files on windows', () {
+
+      var stat = new MockFileStat();
+
+      // A file.
+      when(stat.type).thenReturn(FileSystemEntityType.FILE);
+
+      var result = isExecutableStat(stat, true);
+
+      expect(result, isTrue);
+
+      verifyNever(stat.mode);
+    });
+
+    test('true if has world execute permission', () {
+      var result = isExecutableStat(_getMockFileStat('000000000001'), false);
+      expect(result, isTrue);
+    });
+
+    test('true if has group execute permission', () {
+      var result = isExecutableStat(_getMockFileStat('000000001000'), false);
+      expect(result, isTrue);
+    });
+
+    test('true if has owner execute permission', () {
+      var result = isExecutableStat(_getMockFileStat('000001000000'), false);
+      expect(result, isTrue);
+    });
+
+    test('false if has no execute permissions', () {
+      var result = isExecutableStat(_getMockFileStat('111110110110'), false);
+      expect(result, isFalse);
+    });
+  });
+}
+
+MockFileStat _getMockFileStat(String mode) {
+  var stat = new MockFileStat();
+
+  // A file.
+  when(stat.type).thenReturn(FileSystemEntityType.FILE);
+
+  // Last bit is world execute.
+  when(stat.mode).thenReturn(int.parse(mode, radix: 2));
+
+  return stat;
+}