Reduce test.dart memory usage.

tools/testing/dart/test_suite.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 32 matching lines @@
  * A simple function that tests [arg] and returns `true` or `false`.
  */
 typedef bool Predicate<T>(T arg);
 
 typedef void CreateTest(Path filePath,
                         bool hasCompileError,
                         bool hasRuntimeError,
                         {bool isNegativeIfChecked,
                          bool hasCompileErrorIfChecked,
                          bool hasStaticWarning,
-                         Set<String> multitestOutcome,
                          String multitestKey,
                          Path originTestPath});
 
 typedef void VoidFunction();
 
 /**
  * Calls [function] asynchronously. Returns a future that completes with the
  * result of the function. If the function is `null`, returns a future that
  * completes immediately with `null`.
  */
@@ skipping 50 matching lines @@
 /**
  * A TestSuite represents a collection of tests.  It creates a [TestCase]
  * object for each test to be run, and passes the test cases to a callback.
  *
  * Most TestSuites represent a directory or directory tree containing tests,
  * and a status file containing the expected results when these tests are run.
  */
 abstract class TestSuite {
   final Map configuration;
   final String suiteName;
+  // This function is set by subclasses before enqueueing starts.
+  Function doTest;
+
 
   TestSuite(this.configuration, this.suiteName);
 
   Map<String, String> get environmentOverrides {
     return {
       'DART_CONFIGURATION' : TestUtils.configurationDir(configuration),
     };
   }
 
   /**
@@ skipping 104 matching lines @@
   /**
    * Call the callback function onTest with a [TestCase] argument for each
    * test in the suite.  When all tests have been processed, call [onDone].
    *
    * The [testCache] argument provides a persistent store that can be used to
    * cache information about the test suite, so that directories do not need
    * to be listed each time.
    */
   void forEachTest(TestCaseEvent onTest, Map testCache, [VoidFunction onDone]);
 
-
-  // This function is set by subclasses before enqueueing starts.
-  Function doTest;
-
   // This function will be called for every TestCase of this test suite.
   // It will
   //  - handle sharding
   //  - update SummaryReport
   //  - handle SKIP/SKIP_BY_DESIGN markers
   //  - test if the selector matches
   // and will enqueue the test (if necessary).
   void enqueueNewTestCase(TestCase testCase) {
     var expectations = testCase.expectedOutcomes;
 
@@ skipping 306 matching lines @@
 
 class TestInformation {
   Path originTestPath;
   Path filePath;
   Map optionsFromFile;
   bool hasCompileError;
   bool hasRuntimeError;
   bool isNegativeIfChecked;
   bool hasCompileErrorIfChecked;
   bool hasStaticWarning;
-  Set<String> multitestOutcome;
   String multitestKey;
 
   TestInformation(this.filePath, this.optionsFromFile,
                   this.hasCompileError, this.hasRuntimeError,
                   this.isNegativeIfChecked, this.hasCompileErrorIfChecked,
                   this.hasStaticWarning,
-                  this.multitestOutcome,
                   {this.multitestKey, this.originTestPath}) {
     assert(filePath.isAbsolute);
     if (originTestPath == null) originTestPath = filePath;
   }
 }
 
 /**
  * A standard [TestSuite] implementation that searches for tests in a
  * directory, and creates [TestCase]s that compile and/or run them.
  */
@@ skipping 102 matching lines @@
         return enqueueTests();
       } else {
         // We rely on enqueueing completing asynchronously.
         return asynchronously(() {
           for (var info in testCache[suiteName]) {
             enqueueTestCaseFromTestInformation(info);
           }
         });
       }
     }).then((_) {
+      testExpectations = null;
+      cachedTests = null;
+      doTest = null;
       if (onDone != null) onDone();
     });
   }
 
   /**
    * If Content shell/Dartium is required, and not yet updated, waits for
    * the update then completes. Otherwise completes immediately.
    */
   Future updateDartium() {
     var completer = new Completer();
@@ skipping 300 matching lines @@
                 environmentOverrides));
   }
 
   CreateTest makeTestCaseCreator(Map optionsFromFile) {
     return (Path filePath,
             bool hasCompileError,
             bool hasRuntimeError,
             {bool isNegativeIfChecked: false,
              bool hasCompileErrorIfChecked: false,
              bool hasStaticWarning: false,
-             Set<String> multitestOutcome: null,
              String multitestKey,
              Path originTestPath}) {
       // Cache the test information for each test case.
       var info = new TestInformation(filePath,
                                      optionsFromFile,
                                      hasCompileError,
                                      hasRuntimeError,
                                      isNegativeIfChecked,
                                      hasCompileErrorIfChecked,
                                      hasStaticWarning,
-                                     multitestOutcome,
                                      multitestKey: multitestKey,
                                      originTestPath: originTestPath);
       cachedTests.add(info);
       enqueueTestCaseFromTestInformation(info);
     };
   }
 
   /**
    * _createUrlPathFromFile takes a [file], which is either located in the dart
    * or in the build directory, and will return a String representing
@@ skipping 1172 matching lines @@
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout
  * $compileErrorSkip tests are skipped on browsers due to compile-time error
 """;
     print(report);
   }
 }