Handle creation of class members in files other than the file containing the error (issue 30327)

pkg/analysis_server/test/services/correction/fix_test.dart

Index: pkg/analysis_server/test/services/correction/fix_test.dart
diff --git a/pkg/analysis_server/test/services/correction/fix_test.dart b/pkg/analysis_server/test/services/correction/fix_test.dart
index 8f3d30effc84565a00271d856921811798fcc27f..28b95c4033dff7630dc5fe77336d77b16917d4a0 100644
--- a/pkg/analysis_server/test/services/correction/fix_test.dart
+++ b/pkg/analysis_server/test/services/correction/fix_test.dart
@@ -85,11 +85,13 @@ bool test() {
     List<SourceFileEdit> fileEdits = change.edits;
     expect(fileEdits, hasLength(1));
 
+    String fileContent = testCode;
     if (target != null) {
       expect(target, fileEdits.first.file);
+      fileContent = provider.getFile(target).readAsStringSync();
     }
 
-    resultCode = SourceEdit.applySequence(testCode, change.edits[0].edits);
+    resultCode = SourceEdit.applySequence(fileContent, change.edits[0].edits);
     // verify
     expect(resultCode, expected);
   }
@@ -1630,6 +1632,39 @@ main(A a) {
 ''');
   }
 
+  test_createField_getter_qualified_instance_differentLibrary() async {

[scheglov, 2017/08/09 15:52:07]

There were two changes - for fields and for getters.
This one tests fields.
Do we need another test for getters?

[Brian Wilkerson, 2017/08/09 15:56:33]

Not the way the code is currently written, but I've added it in case the code
changes.

+    addSource('/other.dart', '''
+/**
+ * A comment to push the offset of the braces for the following class
+ * declaration past the end of the content of the test file. Used to catch an
+ * index out of bounds exception that occurs when using the test source instead
+ * of the target source to compute the location at which to insert the field.
+ */
+class A {
+}
+''');
+    await resolveTestUnit('''
+import 'other.dart';
+main(A a) {
+  int v = a.test;
+}
+''');
+    await assertHasFix(
+        DartFixKind.CREATE_FIELD,
+        '''
+/**
+ * A comment to push the offset of the braces for the following class
+ * declaration past the end of the content of the test file. Used to catch an
+ * index out of bounds exception that occurs when using the test source instead
+ * of the target source to compute the location at which to insert the field.
+ */
+class A {
+  int test;
+}
+''',
+        target: '/other.dart');
+  }
+
   test_createField_getter_qualified_instance_dynamicType() async {
     await resolveTestUnit('''
 class A {