Make pub publish more user friendly:

utils/tests/pub/path/path_posix_test.dart

Index: utils/tests/pub/path/path_posix_test.dart
diff --git a/utils/tests/pub/path/path_posix_test.dart b/utils/tests/pub/path/path_posix_test.dart
index a34c32d57c2c2802e481b4a0c88cef8b52563a84..444c33ebb366a9463cd3f518a6755d9170a3343b 100644
--- a/utils/tests/pub/path/path_posix_test.dart
+++ b/utils/tests/pub/path/path_posix_test.dart
@@ -265,6 +265,29 @@ main() {
     });
   });
 
+  group('split', () {
+    test('splits out directories', () {
+      expect(builder.split(''), []);
+      expect(builder.split('a'), ['a']);
+      expect(builder.split('a/b/c.txt'), ['a', 'b', 'c.txt']);
+    });
+
+    test('does not normalize', () {
+      expect(builder.split('.'), ['.']);
+      expect(builder.split('..'), ['..']);
+      expect(builder.split('a/b/../c/./d'), ['a', 'b', '..', 'c', '.', 'd']);
+    });
+
+    test('collapses empty parts', () {
+      expect(builder.split('a//b///c'), ['a', 'b', 'c']);
+    });
+
+    test('includes the root prefix in the first part', () {
+      expect(builder.split('/'), ['/']);
+      expect(builder.split('/a/b/c'), ['/a', 'b', 'c']);
+    });
+  });
+
   test('withoutExtension', () {
     expect(builder.withoutExtension(''), '');
     expect(builder.withoutExtension('a'), 'a');