Binary assets and more unit tests for Asset.

pkg/barback/test/asset_test.dart

Index: pkg/barback/test/asset_test.dart
diff --git a/pkg/barback/test/asset_test.dart b/pkg/barback/test/asset_test.dart
index fb8b1624a5d21fa1aece3c25e7cd69b7c1c0c93e..c2ecefc8d9d62e91c48d924280bc14a8777ed176 100644
--- a/pkg/barback/test/asset_test.dart
+++ b/pkg/barback/test/asset_test.dart
@@ -6,17 +6,51 @@ library barback.test.asset_test;
 
 import 'dart:async';
 import 'dart:io';
+import 'dart:utf';
 
 import 'package:barback/barback.dart';
+import 'package:pathos/path.dart' as pathos;
 import 'package:unittest/unittest.dart';
 
 import 'utils.dart';
 
+/// The contents of the test binary file.
+final binaryContents = [0, 1, 2, 3, 4];
+
 main() {
   initConfig();
 
+  Directory tempDir;
+  String binaryFilePath;
+  String textFilePath;
+  String utf32FilePath;
+
+  setUp(() {
+    // Create a temp file we can use for assets.
+    tempDir = new Directory("").createTempSync();
+    binaryFilePath = pathos.join(tempDir.path, "file.bin");
+    new File(binaryFilePath).writeAsBytesSync(binaryContents);
+
+    textFilePath = pathos.join(tempDir.path, "file.txt");
+    new File(textFilePath).writeAsStringSync("çøñ†éℵ™");
+
+    utf32FilePath = pathos.join(tempDir.path, "file.utf32");
+    new File(utf32FilePath).writeAsBytesSync(encodeUtf32("çøñ†éℵ™"));
+  });
+
+  tearDown(() {
+    if (tempDir != null) tempDir.deleteSync(recursive: true);
+  });
+
   var id = new AssetId.parse("package|path/to/asset.txt");
 
+  group("Asset.fromBytes", () {
+    test("returns an asset with the given ID", () {
+      var asset = new Asset.fromBytes(id, [1]);
+      expect(asset.id, equals(id));
+    });
+  });
+
   group("Asset.fromFile", () {
     test("returns an asset with the given ID", () {
       var asset = new Asset.fromFile(id, new File("asset.txt"));
@@ -37,4 +71,110 @@ main() {
       expect(asset.id, equals(id));
     });
   });
+
+  group("read()", () {
+    test("gets the UTF-8-encoded string for a string asset", () {
+      var asset = new Asset.fromString(id, "çøñ†éℵ™");
+      expect(asset.read().toList(),
+          completion(equals([encodeUtf8("çøñ†éℵ™")])));
+    });
+
+    test("gets the raw bytes for a byte asset", () {
+      var asset = new Asset.fromBytes(id, binaryContents);
+      expect(asset.read().toList(),
+          completion(equals([binaryContents])));
+    });
+
+    test("gets the raw bytes for a binary file", () {
+      var asset = new Asset.fromPath(id, binaryFilePath);
+      expect(asset.read().toList(),
+          completion(equals([binaryContents])));
+    });
+
+    test("gets the raw bytes for a text file", () {
+      var asset = new Asset.fromPath(id, textFilePath);
+      expect(asset.read().toList(),
+          completion(equals([encodeUtf8("çøñ†éℵ™")])));
+    });
+  });
+
+  group("readAsString()", () {
+    group("byte asset", () {
+      test("defaults to UTF-8 if encoding is omitted", () {
+        var asset = new Asset.fromBytes(id, encodeUtf8("çøñ†éℵ™"));
+        expect(asset.readAsString(),
+            completion(equals("çøñ†éℵ™")));
+      });
+
+      test("supports UTF-8", () {
+        var asset = new Asset.fromBytes(id, encodeUtf8("çøñ†éℵ™"));
+        expect(asset.readAsString(encoding: Encoding.UTF_8),
+            completion(equals("çøñ†éℵ™")));
+      });
+
+      // TODO(rnystrom): Test other encodings once #6284 is fixed.
+    });
+
+    group("string asset", () {
+      test("gets the string", () {
+        var asset = new Asset.fromString(id, "contents");
+        expect(asset.readAsString(),
+            completion(equals("contents")));
+      });
+
+      test("ignores the encoding", () {
+        var asset = new Asset.fromString(id, "contents");
+        expect(asset.readAsString(encoding: Encoding.ISO_8859_1),
+            completion(equals("contents")));
+      });
+    });
+
+    group("file asset", () {
+      test("defaults to UTF-8 if encoding is omitted", () {
+        var asset = new Asset.fromPath(id, textFilePath);
+        expect(asset.readAsString(),
+            completion(equals("çøñ†éℵ™")));
+      });
+    });
+  });
+
+  group("toString()", () {
+    group("byte asset", () {
+      test("shows the list of bytes in hex", () {
+        var asset = new Asset.fromBytes(id,
+            [0, 1, 2, 4, 8, 16, 32, 64, 128, 255]);
+        expect(asset.toString(), equals(
+            "Bytes [00 01 02 04 08 10 20 40 80 ff]"));
+      });
+
+      test("truncates the middle of there are more than ten bytes", () {
+        var asset = new Asset.fromBytes(id,
+            [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]);
+        expect(asset.toString(), equals(
+            "Bytes [01 02 03 04 05 ... 0a 0b 0c 0d 0e]"));
+      });
+    });
+
+    group("string asset", () {
+      test("shows the contents", () {
+        var asset = new Asset.fromString(id, "contents");
+        expect(asset.toString(), equals(
+            'String "contents"'));
+      });
+
+      test("truncates the middle of there are more than 40 characters", () {
+        var asset = new Asset.fromString(id,
+            "this is a fairly long string asset content that gets shortened");
+        expect(asset.toString(), equals(
+            'String "this is a fairly lon ...  that gets shortened"'));
+      });
+    });
+
+    group("file asset", () {
+      test("shows the file path", () {
+        var asset = new Asset.fromPath(id, "path.txt");
+        expect(asset.toString(), equals('File "path.txt"'));
+      });
+    });
+  });
 }