check for null completion node

pkg/analysis_server/test/domain_completion_test.dart

Index: pkg/analysis_server/test/domain_completion_test.dart
diff --git a/pkg/analysis_server/test/domain_completion_test.dart b/pkg/analysis_server/test/domain_completion_test.dart
index 08fa7e6dfe90a88eca031a45888cbd709c45b504..21307d553142c03936547e54218b3fbc7fff7d4f 100644
--- a/pkg/analysis_server/test/domain_completion_test.dart
+++ b/pkg/analysis_server/test/domain_completion_test.dart
@@ -364,46 +364,6 @@ class CompletionTest extends AbstractAnalysisTest {
     });
   }
 
-  test_partFile() {
-    addFile('/project/bin/testA.dart', '''
-      library libA;
-      part "$testFile";
-      import 'dart:html';
-      class A { }
-    ''');
-    addTestFile('''
-      part of libA;
-      main() {^}''');
-    return getSuggestions().then((_) {
-      expect(replacementOffset, equals(completionOffset));
-      expect(replacementLength, equals(0));
-      assertHasResult(CompletionSuggestionKind.INVOCATION, 'Object');
-      assertHasResult(CompletionSuggestionKind.INVOCATION, 'HtmlElement');
-      assertHasResult(CompletionSuggestionKind.INVOCATION, 'A');
-      assertNoResult('test');
-    });
-  }
-
-  test_partFile2() {
-    addFile('/testA.dart', '''
-      part of libA;
-      class A { }''');
-    addTestFile('''
-      library libA;
-      part "/testA.dart";
-      import 'dart:html';
-      main() {^}
-    ''');
-    return getSuggestions().then((_) {
-      expect(replacementOffset, equals(completionOffset));
-      expect(replacementLength, equals(0));
-      assertHasResult(CompletionSuggestionKind.INVOCATION, 'Object');
-      assertHasResult(CompletionSuggestionKind.INVOCATION, 'HtmlElement');
-      assertHasResult(CompletionSuggestionKind.INVOCATION, 'A');
-      assertNoResult('test');
-    });
-  }
-
   test_imports_prefixed() {
     addTestFile('''
       import 'dart:html' as foo;
@@ -484,6 +444,61 @@ class CompletionTest extends AbstractAnalysisTest {
     });
   }
 
+  test_partFile() {
+    addFile('/project/bin/testA.dart', '''
+      library libA;
+      part "$testFile";
+      import 'dart:html';
+      class A { }
+    ''');
+    addTestFile('''
+      part of libA;
+      main() {^}''');
+    return getSuggestions().then((_) {
+      expect(replacementOffset, equals(completionOffset));
+      expect(replacementLength, equals(0));
+      assertHasResult(CompletionSuggestionKind.INVOCATION, 'Object');
+      assertHasResult(CompletionSuggestionKind.INVOCATION, 'HtmlElement');
+      assertHasResult(CompletionSuggestionKind.INVOCATION, 'A');
+      assertNoResult('test');
+    });
+  }
+
+  test_partFile2() {
+    addFile('/testA.dart', '''
+      part of libA;
+      class A { }''');
+    addTestFile('''
+      library libA;
+      part "/testA.dart";
+      import 'dart:html';
+      main() {^}
+    ''');
+    return getSuggestions().then((_) {
+      expect(replacementOffset, equals(completionOffset));
+      expect(replacementLength, equals(0));
+      assertHasResult(CompletionSuggestionKind.INVOCATION, 'Object');
+      assertHasResult(CompletionSuggestionKind.INVOCATION, 'HtmlElement');
+      assertHasResult(CompletionSuggestionKind.INVOCATION, 'A');
+      assertNoResult('test');
+    });
+  }
+
+  test_simple() {
+    addTestFile('''
+      void main() {
+        ^
+      }
+    ''');
+    return getSuggestions().then((_) {
+      expect(replacementOffset, equals(completionOffset));
+      expect(replacementLength, equals(0));
+      assertHasResult(CompletionSuggestionKind.INVOCATION, 'Object');
+      assertNoResult('HtmlElement');
+      assertNoResult('test');
+    });
+  }
+
   test_topLevel() {
     addTestFile('''
       typedef foo();