Dynamically load packages for dartdevc tests in test.dart.

pkg/dev_compiler/lib/src/compiler/command.dart

 // Copyright (c) 2016, 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:io';
 import 'package:analyzer/src/command_line/arguments.dart'
     show
         defineAnalysisArguments,
         filterUnknownArguments,
         ignoreUnrecognizedFlagsFlag;
@@ skipping 162 matching lines @@
       _usageException('Output file $firstOutPath must be within the module '
           'root directory $moduleRoot');
     }
     modulePath =
         path.withoutExtension(path.relative(firstOutPath, from: moduleRoot));
   } else {
     moduleRoot = path.dirname(firstOutPath);
     modulePath = path.basenameWithoutExtension(firstOutPath);
   }
 
-  var unit = new BuildUnit(modulePath, libraryRoot, argResults.rest,
-      (source) => _moduleForLibrary(moduleRoot, source, compilerOpts));
+  var unit = new BuildUnit(
+      modulePath,
+      libraryRoot,
+      argResults.rest,
+      (source) =>
+          _moduleForLibrary(moduleRoot, source, analyzerOptions, compilerOpts));
 
   var module = compiler.compile(unit, compilerOpts);
   module.errors.forEach(printFn);
 
   if (!module.isValid) {
     throw compilerOpts.unsafeForceCompile
         ? new ForceCompileErrorException()
         : new CompileErrorException();
   }
 
@@ skipping 15 matching lines @@
       var file = new File(summaryPath);
       if (!file.existsSync() ||
           _changed(file.readAsBytesSync(), module.summaryBytes)) {
         if (!file.parent.existsSync()) file.parent.createSync(recursive: true);
         file.writeAsBytesSync(module.summaryBytes);
       }
     }
   }
 }
 
-String _moduleForLibrary(
-    String moduleRoot, Source source, CompilerOptions compilerOpts) {
+String _moduleForLibrary(String moduleRoot, Source source,
+    AnalyzerOptions analyzerOptions, CompilerOptions compilerOpts) {
   if (source is InSummarySource) {
     var summaryPath = source.summaryPath;
+
+    if (analyzerOptions.customSummaryModules.containsKey(summaryPath)) {
+      return analyzerOptions.customSummaryModules[summaryPath];
+    }
+
     var ext = '.${compilerOpts.summaryExtension}';
     if (path.isWithin(moduleRoot, summaryPath) && summaryPath.endsWith(ext)) {
       var buildUnitPath =
           summaryPath.substring(0, summaryPath.length - ext.length);
       return path.url
           .joinAll(path.split(path.relative(buildUnitPath, from: moduleRoot)));
     }
 
     _usageException('Imported file ${source.uri} is not within the module root '
         'directory $moduleRoot');
@@ skipping 31 matching lines @@
 /// Thrown when the input source code has errors.
 class CompileErrorException implements Exception {
   toString() => '\nPlease fix all errors before compiling (warnings are okay).';
 }
 
 /// Thrown when force compilation failed (probably due to static errors).
 class ForceCompileErrorException extends CompileErrorException {
   toString() =>
       '\nForce-compilation not successful. Please check static errors.';
 }