Make completion tests handle exceptions during getSuggestions().

pkg/analysis_server/test/completion_test_support.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.
 
 library test.completion.support;
 
 import 'dart:collection';
 
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analyzer/src/generated/java_core.dart';
@@ skipping 47 matching lines @@
     return;
     if (suggestions.any(
         (CompletionSuggestion suggestion) => suggestion.completion == completion)) {
       fail(
           "Did not expect completion '$completion' but found:\n  $suggestedCompletions");
     }
   }
 
   runTest(LocationSpec spec, [Map<String, String> extraFiles]) {
     super.setUp();
-    String content = spec.source;
-    addFile(testFile, content);
-    this.testCode = content;
-    completionOffset = spec.testLocation;
-    if (extraFiles != null) {
-      extraFiles.forEach((String fileName, String content) {
-        addFile(fileName, content);
-      });
-    }
-    return getSuggestions().then((_) {
-      try {
-        //expect(replacementOffset, equals(completionOffset));
-        //expect(replacementLength, equals(0));
-        for (String result in spec.positiveResults) {
-          assertHasCompletion(result);
-        }
-        for (String result in spec.negativeResults) {
-          assertHasNoCompletion(result);
-        }
-      } finally {
-        super.tearDown();
+    return new Future(() {
+      String content = spec.source;
+      addFile(testFile, content);
+      this.testCode = content;
+      completionOffset = spec.testLocation;
+      if (extraFiles != null) {
+        extraFiles.forEach((String fileName, String content) {
+          addFile(fileName, content);
+        });
       }
+    }).then((_) => getSuggestions()).then((_) {
+      //expect(replacementOffset, equals(completionOffset));
+      //expect(replacementLength, equals(0));
+      for (String result in spec.positiveResults) {
+        assertHasCompletion(result);
+      }
+      for (String result in spec.negativeResults) {
+        assertHasNoCompletion(result);
+      }
+    }).whenComplete(() {
+      super.tearDown();
     });
   }
 
   /**
    * Generate a set of completion tests based on the given [originalSource].
    *
    * The source string has completion points embedded in it, which are
    * identified by '!X' where X is a single character. Each X is matched to
    * positive or negative results in the array of [validationStrings].
    * Validation strings contain the name of a prediction with a two character
@@ skipping 156 matching lines @@
           err
               ..write(' ')
               ..write(ch);
         }
       }
       throw new IllegalStateException(err.toString());
     }
     return tests.values.toList();
   }
 }