Generate mock libraries and assert that helpers are non-null.

tests/compiler/dart2js/compiler_helper.dart

Index: tests/compiler/dart2js/compiler_helper.dart
diff --git a/tests/compiler/dart2js/compiler_helper.dart b/tests/compiler/dart2js/compiler_helper.dart
index c935ee711ac73bdd3adf4719c2a93471875bbf90..be6ca509708cf4ba8e72d0b6804c709bb5851ce3 100644
--- a/tests/compiler/dart2js/compiler_helper.dart
+++ b/tests/compiler/dart2js/compiler_helper.dart
@@ -47,8 +47,6 @@ export 'mock_compiler.dart';
 
 Future<String> compile(String code,
                        {String entry: 'main',
-                        String coreSource: DEFAULT_CORELIB,
-                        String interceptorsSource: DEFAULT_INTERCEPTORSLIB,
                         bool enableTypeAssertions: false,
                         bool minify: false,
                         bool analyzeAll: false,
@@ -56,11 +54,9 @@ Future<String> compile(String code,
                         void check(String generated)}) {
   MockCompiler compiler = new MockCompiler.internal(
       enableTypeAssertions: enableTypeAssertions,
-      coreSource: coreSource,
       // Type inference does not run when manually
       // compiling a method.
       disableTypeInference: true,
-      interceptorsSource: interceptorsSource,
       enableMinification: minify,
       disableInlining: disableInlining);
   return compiler.init().then((_) {
@@ -93,7 +89,7 @@ Future<String> compile(String code,
 MockCompiler compilerFor(String code, Uri uri,
                          {bool analyzeAll: false,
                           bool analyzeOnly: false,
-                          String coreSource: DEFAULT_CORELIB,
+                          Map coreSource,

[karlklose, 2014/07/03 08:31:15]

Could you type the map?

[Johnni Winther, 2014/07/03 09:23:25]

Done.

                           bool disableInlining: true,
                           bool minify: false,
                           int expectedErrors,
@@ -111,7 +107,7 @@ MockCompiler compilerFor(String code, Uri uri,
 }
 
 Future<String> compileAll(String code,
-                          {String coreSource: DEFAULT_CORELIB,
+                          {Map coreSource,
                           bool disableInlining: true,
                           bool minify: false,
                           int expectedErrors,