Support all Transform methods on ForeignTransform.

sdk/lib/_internal/pub/test/transformer/can_use_read_input_test.dart

Index: sdk/lib/_internal/pub/test/transformer/can_use_read_input_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/prints_a_transform_error_in_apply_test.dart b/sdk/lib/_internal/pub/test/transformer/can_use_read_input_test.dart
similarity index 62%
copy from sdk/lib/_internal/pub/test/transformer/prints_a_transform_error_in_apply_test.dart
copy to sdk/lib/_internal/pub/test/transformer/can_use_read_input_test.dart
index ac8f11295c3ecba2c10d95195fa669f56732cd6e..7fde01a76c0b43a0a20d422af2d5305de3e9adc4 100644
--- a/sdk/lib/_internal/pub/test/transformer/prints_a_transform_error_in_apply_test.dart
+++ b/sdk/lib/_internal/pub/test/transformer/can_use_read_input_test.dart
@@ -4,13 +4,11 @@
 
 library pub_tests;
 
-import 'package:scheduled_test/scheduled_test.dart';
-
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
-final transformer = """
+const TRANSFORMER = """
 import 'dart:async';
 
 import 'package:barback/barback.dart';
@@ -20,20 +18,27 @@ class RewriteTransformer extends Transformer {
 
   String get allowedExtensions => '.txt';
 
-  Future apply(Transform transform) => throw new Exception('oh no!');
+  Future apply(Transform transform) {
+    return transform.readInput(transform.primaryInput.id).toList()
+        .then((contents) {
+      var id = transform.primaryInput.id.changeExtension(".out");
+      var asset = new Asset.fromString(id, "\$contents.out");
+      transform.addOutput(asset);
+    });
+  }
 }
 """;
 
 main() {
   initConfig();
-  integration("prints a transform error in apply", () {
+  integration("a transform can use readInputAsString", () {
     d.dir(appPath, [
       d.pubspec({
         "name": "myapp",
         "transformers": ["myapp/src/transformer"]
       }),
       d.dir("lib", [d.dir("src", [
-        d.file("transformer.dart", transformer)
+        d.file("transformer.dart", TRANSFORMER)
       ])]),
       d.dir("web", [
         d.file("foo.txt", "foo")
@@ -42,11 +47,8 @@ main() {
 
     createLockFile('myapp', pkg: ['barback']);
 
-    var server = startPubServe();
-    expect(server.nextErrLine(),
-        completion(equals('Build error:')));
-    expect(server.nextErrLine(), completion(equals('Transform Rewrite on '
-        'myapp|web/foo.txt threw error: oh no!')));
+    startPubServe();
+    requestShouldSucceed("foo.out", "[[102 111 111]].out");
     endPubServe();
   });
 }