Use Map(s) for top-level declarations.

pkg/analyzer/test/src/dart/analysis/file_state_test.dart

Index: pkg/analyzer/test/src/dart/analysis/file_state_test.dart
diff --git a/pkg/analyzer/test/src/dart/analysis/file_state_test.dart b/pkg/analyzer/test/src/dart/analysis/file_state_test.dart
index 8a3a8da40a8a1e98c0b170b106f8051661e67557..bb45ad1dd7f4432e7d2dc481c1b3096bf51bd83d 100644
--- a/pkg/analyzer/test/src/dart/analysis/file_state_test.dart
+++ b/pkg/analyzer/test/src/dart/analysis/file_state_test.dart
@@ -73,8 +73,9 @@ export 'a.dart';
 class B {}
 ''');
     FileState file = fileSystemState.getFileForPath(b);
-    List<TopLevelDeclaration> declarations = file.exportedTopLevelDeclarations;
-    expect(declarations.map((t) => t.name), unorderedEquals(['A', 'B']));
+    Map<String, TopLevelDeclaration> declarations =
+        file.exportedTopLevelDeclarations;
+    expect(declarations.keys, unorderedEquals(['A', 'B']));
   }
 
   test_exportedTopLevelDeclarations_export2_show() {
@@ -162,9 +163,10 @@ export 'a.dart';
 int V;
 ''');
     FileState file = fileSystemState.getFileForPath(b);
-    List<TopLevelDeclaration> declarations = file.exportedTopLevelDeclarations;
-    expect(declarations.map((t) => t.name), unorderedEquals(['V']));
-    expect(declarations.single.kind, TopLevelDeclarationKind.variable);
+    Map<String, TopLevelDeclaration> declarations =
+        file.exportedTopLevelDeclarations;
+    expect(declarations.keys, unorderedEquals(['V']));
+    expect(declarations['V'].kind, TopLevelDeclarationKind.variable);
   }
 
   test_exportedTopLevelDeclarations_export_show() {
@@ -499,16 +501,13 @@ set _V3(_) {}
 ''');
     FileState file = fileSystemState.getFileForPath(path);
 
-    List<TopLevelDeclaration> declarations = file.topLevelDeclarations;
+    Map<String, TopLevelDeclaration> declarations = file.topLevelDeclarations;
 
     void assertHas(String name, TopLevelDeclarationKind kind) {
-      expect(
-          declarations,
-          contains(predicate(
-              (TopLevelDeclaration t) => t.name == name && t.kind == kind)));
+      expect(declarations[name]?.kind, kind);
     }
 
-    expect(declarations.map((t) => t.name),
+    expect(declarations.keys,
         unorderedEquals(['C', 'F', 'E', 'f', 'V1', 'V2', 'V3', 'V4']));
     assertHas('C', TopLevelDeclarationKind.type);
     assertHas('F', TopLevelDeclarationKind.type);
@@ -636,8 +635,9 @@ set _V3(_) {}
 
   void _assertExportedTopLevelDeclarations(String path, List<String> expected) {
     FileState file = fileSystemState.getFileForPath(path);
-    List<TopLevelDeclaration> declarations = file.exportedTopLevelDeclarations;
-    expect(declarations.map((t) => t.name), unorderedEquals(expected));
+    Map<String, TopLevelDeclaration> declarations =
+        file.exportedTopLevelDeclarations;
+    expect(declarations.keys, unorderedEquals(expected));
   }
 
   void _assertFilesWithoutTransitiveFiles(List<FileState> expected) {