[analysis_server] Fix expected EOL in integration test on Windows

Fixes #61255

Change-Id: Ifb11a0add0219c93e167cf673a916fa35fafad12
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/443804
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Samuel Rawlins <[email protected]>
Auto-Submit: Danny Tuppeny <[email protected]>
Reviewed-by: Samuel Rawlins <[email protected]>

Author: DanTup

pkg/analysis_server/integration_test/edit/import_elements_test.dart

@@ -55,11 +55,13 @@ class AnalysisGetImportElementsIntegrationTest
       expect(edit.file, expectedFile);
     }
     var actual = edit.edits;
+    expect(actual, unorderedEquals(expected));
     expect(actual, hasLength(expected.length));
     for (var expectedEdit in expected) {
       var index = find(actual, expectedEdit);
       if (index < 0) {
-        fail('Expected $expectedEdit; not found');
+        var actualDescription = actual.map((edit) => '  - $edit').join('\n');
+        fail('Expected $expectedEdit; not found in:\n$actualDescription');
       }
       actual.removeAt(index);
     }
@@ -96,7 +98,7 @@ class AnalysisGetImportElementsIntegrationTest
       <ImportedElements>[
         ImportedElements(mathPath, '', <String>['Random']),
       ],
-      [SourceEdit(0, 0, "import 'dart:math';\n\n")],
+      [SourceEdit(0, 0, "import 'dart:math';$eol$eol")],
     );
   }
 

pkg/analysis_server/integration_test/support/integration_tests.dart

@@ -11,6 +11,7 @@ import 'package:analysis_server/protocol/protocol_constants.dart';
 import 'package:analysis_server/src/protocol_server.dart';
 import 'package:analysis_server/src/services/pub/pub_command.dart';
 import 'package:analyzer/file_system/physical_file_system.dart';
+import 'package:analyzer/src/test_utilities/platform.dart';
 import 'package:analyzer/src/util/file_paths.dart' as file_paths;
 import 'package:analyzer_testing/mock_packages/mock_packages.dart';
 import 'package:analyzer_testing/utilities/utilities.dart';
@@ -176,6 +177,9 @@ abstract class AbstractAnalysisServerIntegrationTest extends IntegrationTest
     return completer.future;
   }
 
+  /// The line terminator being used for test files and to be expected in edits.
+  String get eol => testEol;
+
   @override
   String get packagesRootPath => packagesDirectory.path;