Future-ify all the html methods and add named parameters

tests/html/fileapi_test.dart

 library fileapi;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:html';
+import 'dart:async';
 
-void fail(message) {
-  guardAsync(() {
-    expect(false, isTrue, reason: message);
-  });
+class FileAndDir {
+  FileEntry file;
+  DirectoryEntry dir;
+  FileAndDir(this.file, this.dir);
 }
 
 FileSystem fs;
 
 main() {
   useHtmlIndividualConfiguration();
 
   group('supported', () {
     test('supported', () {
       expect(FileSystem.supported, true);
     });
   });
 
   getFileSystem() {
-    window.requestFileSystem(Window.TEMPORARY, 100,
-        expectAsync1((FileSystem fileSystem) {
-          fs = fileSystem;
-        }),
-        (e) {
-          fail('Got file error: ${e.code}');
-        });
+    return window.requestFileSystem(Window.TEMPORARY, 100)
+      .then((FileSystem fileSystem) {
+        fs = fileSystem;
+      });
   }
 
   group('unsupported_throws', () {
     test('requestFileSystem', () {
       var expectation = FileSystem.supported ? returnsNormally : throws;
       expect(() {
-        window.requestFileSystem(Window.TEMPORARY, 100, (_) {}, (_) {});
+        window.requestFileSystem(Window.TEMPORARY, 100);
       }, expectation);
     });
   });
 
   group('getDirectory', () {
     if (FileSystem.supported) {
       test('getFileSystem', getFileSystem);
 
       test('directoryDoesntExist', () {
-        fs.root.getDirectory(
+        return fs.root.getDirectory(
             'directory2',
-            options: {},
-            successCallback: (e) {
-              fail('Should not be reached');
-            },
-            errorCallback: expectAsync1((FileError e) {
-              expect(e.code, equals(FileError.NOT_FOUND_ERR));
-            }));
+            options: {})
+              .catchError((e) {
+                expect(e.error.code, equals(FileError.NOT_FOUND_ERR));
+              }, test: (e) => e is FileError);
         });
 
       test('directoryCreate', () {
-        fs.root.getDirectory(
+        return fs.root.getDirectory(
             'directory3',
-            options: {'create': true},
-            successCallback: expectAsync1((DirectoryEntry e) {
-              expect(e.name, equals('directory3'));
-            }),
-            errorCallback: (e) {
-              fail('Got file error: ${e.code}');
-            });
+            options: {'create': true})
+              .then((DirectoryEntry e) {
+                expect(e.name, equals('directory3'));
+              });
         });
     }
   });
 
   group('getFile', () {
     if (FileSystem.supported) {
       test('getFileSystem', getFileSystem);
 
       test('fileDoesntExist', () {
-        fs.root.getFile(
+        return fs.root.getFile(
             'file2',
-            options: {},
-            successCallback: (e) {
-              fail('Should not be reached');
-            },
-            errorCallback: expectAsync1((FileError e) {
-              expect(e.code, equals(FileError.NOT_FOUND_ERR));
-            }));
+            options: {})
+          .catchError((e) {
+            expect(e.error.code, equals(FileError.NOT_FOUND_ERR));
+          }, test: (e) => e is FileError);
       });
 
       test('fileCreate', () {
-        fs.root.getFile(
+        return fs.root.getFile(
             'file4',
-            options: {'create': true},
-            successCallback: expectAsync1((FileEntry e) {
-              expect(e.name, equals('file4'));
-              expect(e.isFile, isTrue);
-
-              e.getMetadata(expectAsync1((Metadata metadata) {
-                var changeTime = metadata.modificationTime;
-                expect(new DateTime.now().difference(changeTime).inSeconds,
-                  lessThan(60));
-              }));
-            }),
-            errorCallback: (e) {
-              fail('Got file error: ${e.code}');
-            });
+            options: {'create': true})
+          .then((FileEntry e) {
+            expect(e.name, equals('file4'));
+            expect(e.isFile, isTrue);
+            return e.getMetadata();
+          }).then((Metadata metadata) {
+            var changeTime = metadata.modificationTime;
+            expect(new DateTime.now().difference(changeTime).inSeconds,
+                lessThan(60));
+            expect(metadata.size, equals(0));
+          });
         });
     }
   });
+
+  // Do the boilerplate to get several files and directories created to then
+  // test the functions that use those items.
+  Future doDirSetup() {
+    return fs.root.getFile(
+      'file4',
+      options: {'create': true})
+        .then((FileEntry file) {
+          return fs.root.getDirectory(
+              'directory3',
+              options: {'create': true})
+            .then((DirectoryEntry dir) {
+              return new Future.immediate(new FileAndDir(file, dir));
+            });
+        });
+  }
+
+  group('directoryReader', () {
+    if (FileSystem.supported) {
+      test('getFileSystem', getFileSystem);
+
+      test('readEntries', () {
+        return doDirSetup()
+          .then((fileAndDir) {
+            var reader = fileAndDir.dir.createReader();
+            return reader.readEntries();
+          }).then((entries) {
+            expect(entries is List, true);
+          });
+      });
+    }
+  });
+
+  group('entry', () {
+    if (FileSystem.supported) {
+      test('getFileSystem', getFileSystem);
+
+      test('copyTo', () {
+        return doDirSetup()
+          .then((fileAndDir) {
+            return fileAndDir.file.copyTo(fileAndDir.dir, name: 'copiedFile');
+          }).then((entry) {
+            expect(entry.isFile, true);
+            expect(entry.name, 'copiedFile');
+          });
+      });
+
+      test('getParent', () {
+        return doDirSetup()
+          .then((fileAndDir) {
+             return fileAndDir.file.getParent();
+          }).then((entry) {
+            expect(entry.name, '');
+            expect(entry.isFile, false);
+          });
+      });
+
+      test('moveTo', () {
+        return doDirSetup()
+          .then((fileAndDir) {
+            return fileAndDir.file.moveTo(fileAndDir.dir, name: 'movedFile');
+          }).then((entry) {
+            expect(entry.name, 'movedFile');
+            expect(entry.fullPath, '/directory3/movedFile');
+            return fs.root.getFile('file4', options: {'create': false});
+          }).catchError((e) {
+            expect(e.error.code, equals(FileError.NOT_FOUND_ERR));
+          }, test: (e) => e is FileError);
+      });
+
+      test('remove', () {
+        return doDirSetup()
+          .then((fileAndDir) {
+            return fileAndDir.file.remove().then((_) {});
+          });
+      });
+    }
+  });
+
+  group('fileEntry', () {
+    if (FileSystem.supported) {
+      test('getFileSystem', getFileSystem);
+
+      test('createWriter', () {
+        return doDirSetup()
+          .then((fileAndDir) {
+            return fileAndDir.file.createWriter();
+          }).then((writer) {
+            expect(writer.position, 0);
+            expect(writer.readyState, FileWriter.INIT);
+            expect(writer.length, 0);
+          });
+      });
+
+      test('file', () {
+        return doDirSetup()
+          .then((fileAndDir) {
+            return fileAndDir.file.file()
+              .then((fileObj) {
+                expect(fileObj.name, fileAndDir.file.name);
+                expect(fileObj.relativePath, '');
+                expect(new DateTime.now().difference(
+                    fileObj.lastModifiedDate).inSeconds, lessThan(60));
+              });
+          });
+      });
+    }
+  });
 }