Fix prints/throws tests on the latest dart2js.

test/frontend/matcher/prints_test.dart

 // Copyright (c) 2014, 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.
 
 import 'dart:async';
 
 import 'package:test/test.dart';
 
 import '../../utils.dart';
 
 void main() {
   group("synchronous", () {
     test("passes with an expected print", () {
       expect(() => print("Hello, world!"), prints("Hello, world!\n"));
     });
 
     test("combines multiple prints", () {
       expect(() {
         print("Hello");
         print("World!");
       }, prints("Hello\nWorld!\n"));
     });
 
     test("works with a Matcher", () {
       expect(() => print("Hello, world!"), prints(contains("Hello")));
     });
 
     test("describes a failure nicely", () async {
+      var closure = () => print("Hello, world!");
       var liveTest = await runTestBody(() {
-        expect(() => print("Hello, world!"), prints("Goodbye, world!\n"));
+        expect(closure, prints("Goodbye, world!\n"));
       });
 
-      expectTestFailed(liveTest,
-          "Expected: prints 'Goodbye, world!\\n'\n"
-          "  ''\n"
-          "  Actual: <$closureString>\n"
-          "   Which: printed 'Hello, world!\\n'\n"
-          "  ''\n"
-          "   Which: is different.\n"
-          "Expected: Goodbye, w ...\n"
-          "  Actual: Hello, wor ...\n"
-          "          ^\n"
-          " Differ at offset 0\n");
+      expectTestFailed(liveTest, allOf([
+        startsWith(
+            "Expected: prints 'Goodbye, world!\\n'\n"
+            "  ''\n"
+            "  Actual: <"),
+        endsWith(">\n"
+            "   Which: printed 'Hello, world!\\n'\n"
+            "  ''\n"
+            "   Which: is different.\n"
+            "Expected: Goodbye, w ...\n"
+            "  Actual: Hello, wor ...\n"
+            "          ^\n"
+            " Differ at offset 0\n")
+      ]));
     });
 
     test("describes a failure with a non-descriptive Matcher nicely", () async {
+      var closure = () => print("Hello, world!");
       var liveTest = await runTestBody(() {
-        expect(() => print("Hello, world!"), prints(contains("Goodbye")));
+        expect(closure, prints(contains("Goodbye")));
       });
 
-      expectTestFailed(liveTest,
-          "Expected: prints contains 'Goodbye'\n"
-          "  Actual: <$closureString>\n"
-          "   Which: printed 'Hello, world!\\n'\n"
-          "  ''\n");
+      expectTestFailed(liveTest, allOf([
+        startsWith(
+            "Expected: prints contains 'Goodbye'\n"
+            "  Actual: <"),
+        endsWith(">\n"
+            "   Which: printed 'Hello, world!\\n'\n"
+            "  ''\n")
+      ]));
     });
 
     test("describes a failure with no text nicely", () async {
+      var closure = () {};
       var liveTest = await runTestBody(() {
-        expect(() {}, prints(contains("Goodbye")));
+        expect(closure, prints(contains("Goodbye")));
       });
 
-      expectTestFailed(liveTest,
-          "Expected: prints contains 'Goodbye'\n"
-          "  Actual: <$closureString>\n"
-          "   Which: printed nothing.\n");
+      expectTestFailed(liveTest, allOf([
+        startsWith(
+            "Expected: prints contains 'Goodbye'\n"
+            "  Actual: <"),
+        endsWith(">\n"
+            "   Which: printed nothing.\n")
+      ]));
     });
 
     test("with a non-function", () async {
       var liveTest = await runTestBody(() {
         expect(10, prints(contains("Goodbye")));
       });
 
       expectTestFailed(liveTest,
           "Expected: prints contains 'Goodbye'\n"
           "  Actual: <10>\n");
@@ skipping 12 matching lines @@
         print("World!");
       }), prints("Hello\nWorld!\n"));
     });
 
     test("works with a Matcher", () {
       expect(() => new Future(() => print("Hello, world!")),
           prints(contains("Hello")));
     });
 
     test("describes a failure nicely", () async {
+      var closure = () => new Future(() => print("Hello, world!"));
       var liveTest = await runTestBody(() {
-        expect(() => new Future(() => print("Hello, world!")),
-            prints("Goodbye, world!\n"));
+        expect(closure, prints("Goodbye, world!\n"));
       });
 
-      expectTestFailed(liveTest, startsWith(
-          "Expected: prints 'Goodbye, world!\\n'\n"
-          "  ''\n"
-          "  Actual: <$closureString>\n"
-          "   Which: printed 'Hello, world!\\n'\n"
-          "  ''\n"
-          "   Which: is different.\n"
-          "Expected: Goodbye, w ...\n"
-          "  Actual: Hello, wor ...\n"
-          "          ^\n"
-          " Differ at offset 0"));
+      expectTestFailed(liveTest, allOf([
+        startsWith(
+            "Expected: prints 'Goodbye, world!\\n'\n"
+            "  ''\n"
+            "  Actual: <"),
+        contains(">\n"
+            "   Which: printed 'Hello, world!\\n'\n"
+            "  ''\n"
+            "   Which: is different.\n"
+            "Expected: Goodbye, w ...\n"
+            "  Actual: Hello, wor ...\n"
+            "          ^\n"
+            " Differ at offset 0")
+      ]));
     });
 
     test("describes a failure with a non-descriptive Matcher nicely", () async {
+      var closure = () => new Future(() => print("Hello, world!"));
       var liveTest = await runTestBody(() {
-        expect(() => new Future(() => print("Hello, world!")),
-            prints(contains("Goodbye")));
+        expect(closure, prints(contains("Goodbye")));
       });
 
-      expectTestFailed(liveTest, startsWith(
-          "Expected: prints contains 'Goodbye'\n"
-          "  Actual: <$closureString>\n"
-          "   Which: printed 'Hello, world!\\n'\n"
-          "  ''"));
+      expectTestFailed(liveTest, allOf([
+        startsWith(
+            "Expected: prints contains 'Goodbye'\n"
+            "  Actual: <"),
+        contains(">\n"
+            "   Which: printed 'Hello, world!\\n'\n"
+            "  ''")
+      ]));
     });
 
     test("describes a failure with no text nicely", () async {
+      var closure = () => new Future.value();
       var liveTest = await runTestBody(() {
-        expect(() => new Future.value(), prints(contains("Goodbye")));
+        expect(closure, prints(contains("Goodbye")));
       });
 
-      expectTestFailed(liveTest, startsWith(
-          "Expected: prints contains 'Goodbye'\n"
-          "  Actual: <$closureString>\n"
-          "   Which: printed nothing."));
+      expectTestFailed(liveTest, allOf([
+        startsWith(
+            "Expected: prints contains 'Goodbye'\n"
+            "  Actual: <"),
+        contains(">\n"
+            "   Which: printed nothing.")
+      ]));
     });
 
     test("won't let the test end until the Future completes", () {
       return expectTestBlocks(() {
         var completer = new Completer();
         expect(() => completer.future, prints(isEmpty));
         return completer;
       }, (completer) => completer.complete());
     });
   });
 }