Validate that root paths are absolute and normalized.

pkg/analyzer/test/src/util/absolute_path_test.dart

 // Copyright (c) 2015, 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.
 
 library test.analyzer.src.util.absolute_path;
 
 import 'package:analyzer/src/util/absolute_path.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../reflective_tests.dart';
 import '../../utils.dart';
 
 main() {
   initializeTestEnvironment();
   runReflectiveTests(AbsolutePathContextPosixTest);
   runReflectiveTests(AbsolutePathContextWindowsTest);
 }
 
 @reflectiveTest
 class AbsolutePathContextPosixTest {
-  AbsolutePathContext context = new AbsolutePathContext(r'/');
+  AbsolutePathContext context = new AbsolutePathContext(false);
 
   void test_append() {
     expect(context.append(r'/path/to', r'foo.dart'), r'/path/to/foo.dart');
   }
 
   void test_basename() {
     expect(context.basename(r'/path/to/foo.dart'), r'foo.dart');
     expect(context.basename(r'/path/to'), r'to');
     expect(context.basename(r'/path'), r'path');
     expect(context.basename(r'/'), r'');
   }
 
   void test_dirname() {
     expect(context.dirname(r'/path/to/foo.dart'), r'/path/to');
     expect(context.dirname(r'/path/to'), r'/path');
     expect(context.dirname(r'/path'), r'/');
     expect(context.dirname(r'/'), r'/');
   }
 
+  void test_isValid_absolute() {
+    expect(context.isValid(r'/foo/bar'), isTrue);
+    expect(context.isValid(r'/foo'), isTrue);
+    expect(context.isValid(r'/'), isTrue);
+    expect(context.isValid(r''), isFalse);
+    expect(context.isValid(r'foo/bar'), isFalse);
+  }
+
+  void test_isValid_normalized() {
+    expect(context.isValid(r'/foo/bar'), isTrue);
+    expect(context.isValid(r'/foo/..bar'), isTrue);
+    expect(context.isValid(r'/foo/.bar/baz'), isTrue);
+    expect(context.isValid(r'/foo/...'), isTrue);
+    expect(context.isValid(r'/foo/.../bar'), isTrue);
+    expect(context.isValid(r'/foo/.bar/.'), isFalse);
+    expect(context.isValid(r'/foo/bar/../baz'), isFalse);
+    expect(context.isValid(r'/foo/bar/..'), isFalse);
+    expect(context.isValid(r'/foo/./bar'), isFalse);
+    expect(context.isValid(r'/.'), isFalse);
+  }
+
   void test_isWithin() {
     expect(context.isWithin(r'/root/path', r'/root/path/a'), isTrue);
     expect(context.isWithin(r'/root/path', r'/root/other'), isFalse);
     expect(context.isWithin(r'/root/path', r'/root/path'), isFalse);
   }
 
   void test_split() {
     expect(context.split(r'/path/to/foo'), [r'', r'path', r'to', r'foo']);
     expect(context.split(r'/path'), [r'', r'path']);
   }
 
   void test_suffix() {
     expect(context.suffix(r'/root/path', r'/root/path/a/b.dart'), r'a/b.dart');
     expect(context.suffix(r'/root/path', r'/root/other.dart'), isNull);
   }
 }
 
 @reflectiveTest
 class AbsolutePathContextWindowsTest {
-  AbsolutePathContext context = new AbsolutePathContext(r'\');
+  AbsolutePathContext context = new AbsolutePathContext(true);
 
   void test_append() {
     expect(context.append(r'C:\path\to', r'foo.dart'), r'C:\path\to\foo.dart');
   }
 
   void test_basename() {
     expect(context.basename(r'C:\path\to\foo.dart'), r'foo.dart');
     expect(context.basename(r'C:\path\to'), r'to');
     expect(context.basename(r'C:\path'), r'path');
     expect(context.basename(r'C:\'), r'');
   }
 
   void test_dirname() {
     expect(context.dirname(r'C:\path\to\foo.dart'), r'C:\path\to');
     expect(context.dirname(r'C:\path\to'), r'C:\path');
     expect(context.dirname(r'C:\path'), r'C:\');
     expect(context.dirname(r'C:\'), r'C:\');
   }
 
+  void test_isValid_absolute() {
+    expect(context.isValid(r'C:\foo\bar'), isTrue);
+    expect(context.isValid(r'c:\foo\bar'), isTrue);
+    expect(context.isValid(r'D:\foo\bar'), isTrue);
+    expect(context.isValid(r'C:\foo'), isTrue);
+    expect(context.isValid(r'C:\'), isTrue);
+    expect(context.isValid(r''), isFalse);
+    expect(context.isValid(r'foo\bar'), isFalse);
+  }
+
+  void test_isValid_normalized() {
+    expect(context.isValid(r'C:\foo\bar'), isTrue);
+    expect(context.isValid(r'C:\foo\..bar'), isTrue);
+    expect(context.isValid(r'C:\foo\.bar\baz'), isTrue);
+    expect(context.isValid(r'C:\foo\...'), isTrue);
+    expect(context.isValid(r'C:\foo\...\bar'), isTrue);
+    expect(context.isValid(r'C:\foo\.bar\.'), isFalse);
+    expect(context.isValid(r'C:\foo\bar\..\baz'), isFalse);
+    expect(context.isValid(r'C:\foo\bar\..'), isFalse);
+    expect(context.isValid(r'C:\foo\.\bar'), isFalse);
+    expect(context.isValid(r'C:\.'), isFalse);
+  }
+
   void test_isWithin() {
     expect(context.isWithin(r'C:\root\path', r'C:\root\path\a'), isTrue);
     expect(context.isWithin(r'C:\root\path', r'C:\root\other'), isFalse);
     expect(context.isWithin(r'C:\root\path', r'C:\root\path'), isFalse);
   }
 
   void test_split() {
     expect(context.split(r'C:\path\to\foo'), [r'C:', r'path', r'to', r'foo']);
     expect(context.split(r'C:\path'), [r'C:', r'path']);
   }
 
   void test_suffix() {
     expect(
         context.suffix(r'C:\root\path', r'C:\root\path\a\b.dart'), r'a\b.dart');
     expect(context.suffix(r'C:\root\path', r'C:\root\other.dart'), isNull);
   }
 }