diff --git a/pkg/front_end/test/fasta/expression_suite.dart b/pkg/front_end/test/fasta/expression_suite.dart
index 8bc064d..32d4d1a 100644
--- a/pkg/front_end/test/fasta/expression_suite.dart
+++ b/pkg/front_end/test/fasta/expression_suite.dart
@@ -53,7 +53,7 @@
 import '../testing_utils.dart' show checkEnvironment;
 import '../utils/kernel_chain.dart' show runDiff, openWrite;
 import 'suite_utils.dart';
-import 'testing/suite.dart';
+import 'testing/environment_keys.dart';
 
 class Context extends ChainContext {
   final CompilerContext compilerContext;
@@ -655,8 +655,8 @@
 Future<Context> createContext(
     Chain suite, Map<String, String> environment) async {
   const Set<String> knownEnvironmentKeys = {
-    UPDATE_EXPECTATIONS,
-    "fuzz",
+    EnvironmentKeys.updateExpectations,
+    EnvironmentKeys.fuzz,
   };
   checkEnvironment(environment, knownEnvironmentKeys);
 
@@ -715,9 +715,10 @@
   final ProcessedOptions optionsNoNNBD =
       new ProcessedOptions(options: optionBuilderNoNNBD, inputs: [entryPoint]);
 
-  final bool updateExpectations = environment[UPDATE_EXPECTATIONS] == "true";
+  final bool updateExpectations =
+      environment[EnvironmentKeys.updateExpectations] == "true";
 
-  final bool fuzz = environment["fuzz"] == "true";
+  final bool fuzz = environment[EnvironmentKeys.fuzz] == "true";
 
   final CompilerContext compilerContext = new CompilerContext(options);
   final CompilerContext compilerContextNoNNBD =
diff --git a/pkg/front_end/test/fasta/modular_suite.dart b/pkg/front_end/test/fasta/modular_suite.dart
index d01fce2..f1cbc4d 100644
--- a/pkg/front_end/test/fasta/modular_suite.dart
+++ b/pkg/front_end/test/fasta/modular_suite.dart
@@ -5,11 +5,12 @@
 library fasta.test.modular_suite;
 
 import 'suite_utils.dart' show internalMain;
+import 'testing/environment_keys.dart';
 import 'testing/suite.dart';
 
 Future<FastaContext> createContext(
     Chain suite, Map<String, String> environment) {
-  environment[COMPILATION_MODE] = CompileMode.modular.name;
+  environment[EnvironmentKeys.compilationMode] = CompileMode.modular.name;
   return FastaContext.create(suite, environment);
 }
 
diff --git a/pkg/front_end/test/fasta/strong_suite.dart b/pkg/front_end/test/fasta/strong_suite.dart
index 382b718..f5605ed 100644
--- a/pkg/front_end/test/fasta/strong_suite.dart
+++ b/pkg/front_end/test/fasta/strong_suite.dart
@@ -5,13 +5,14 @@
 library fasta.test.strong_suite;
 
 import 'suite_utils.dart' show internalMain;
+import 'testing/environment_keys.dart';
 import 'testing/suite.dart';
 
 Future<FastaContext> createContext(
     Chain suite, Map<String, String> environment) {
-  environment[COMPILATION_MODE] = CompileMode.full.name;
-  environment['soundNullSafety'] = "true";
-  environment["semiFuzz"] ??= "true";
+  environment[EnvironmentKeys.compilationMode] = CompileMode.full.name;
+  environment[EnvironmentKeys.soundNullSafety] = "true";
+  environment[EnvironmentKeys.semiFuzz] ??= "true";
   return FastaContext.create(suite, environment);
 }
 
diff --git a/pkg/front_end/test/fasta/testing/environment_keys.dart b/pkg/front_end/test/fasta/testing/environment_keys.dart
new file mode 100644
index 0000000..ec4ff45
--- /dev/null
+++ b/pkg/front_end/test/fasta/testing/environment_keys.dart
@@ -0,0 +1,20 @@
+// Copyright (c) 2024, 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.
+
+class EnvironmentKeys {
+  static const String addDebugBreaks = "addDebugBreaks";
+  static const String annotateLines = "annotateLines";
+  static const String compilationMode = " compilation mode ";
+  static const String fuzz = "fuzz";
+  static const String ignoreExpectations = "ignoreExpectations";
+  static const String platformBinaries = "platformBinaries";
+  static const String semiFuzz = "semiFuzz";
+  static const String skipTests = "skipTests";
+  static const String skipVm = "skipVm";
+  static const String soundNullSafety = "soundNullSafety";
+  static const String trace = "trace";
+  static const String updateComments = "updateComments";
+  static const String updateExpectations = "updateExpectations";
+  static const String verify = "verify";
+}
diff --git a/pkg/front_end/test/fasta/testing/suite.dart b/pkg/front_end/test/fasta/testing/suite.dart
index c76c1f8..caab5b1d 100644
--- a/pkg/front_end/test/fasta/testing/suite.dart
+++ b/pkg/front_end/test/fasta/testing/suite.dart
@@ -136,16 +136,12 @@
         WriteDill;
 import '../../utils/validating_instrumentation.dart'
     show ValidatingInstrumentation;
+import 'environment_keys.dart';
 import 'folder_options.dart';
 import 'test_options.dart';
 
 export 'package:testing/testing.dart' show Chain, runMe;
 
-const String COMPILATION_MODE = " compilation mode ";
-
-const String UPDATE_EXPECTATIONS = "updateExpectations";
-const String UPDATE_COMMENTS = "updateComments";
-
 const String EXPECTATIONS = '''
 [
   {
@@ -231,7 +227,8 @@
   final bool updateExpectations;
 
   @override
-  String get updateExpectationsOption => '${UPDATE_EXPECTATIONS}=true';
+  String get updateExpectationsOption =>
+      '${EnvironmentKeys.updateExpectations}=true';
 
   @override
   bool get canBeFixWithUpdateExpectations => true;
@@ -461,17 +458,15 @@
   static Future<FastaContext> create(
       Chain suite, Map<String, String> environment) {
     const Set<String> knownEnvironmentKeys = {
-      "enableExtensionMethods",
-      "enableNonNullable",
-      "soundNullSafety",
-      "ignoreExpectations",
-      UPDATE_EXPECTATIONS,
-      UPDATE_COMMENTS,
-      "skipVm",
-      "semiFuzz",
-      "verify",
-      "platformBinaries",
-      COMPILATION_MODE,
+      EnvironmentKeys.soundNullSafety,
+      EnvironmentKeys.ignoreExpectations,
+      EnvironmentKeys.updateExpectations,
+      EnvironmentKeys.updateComments,
+      EnvironmentKeys.skipVm,
+      EnvironmentKeys.semiFuzz,
+      EnvironmentKeys.verify,
+      EnvironmentKeys.platformBinaries,
+      EnvironmentKeys.compilationMode,
     };
     checkEnvironment(environment, knownEnvironmentKeys);
 
@@ -481,14 +476,17 @@
     Map<ExperimentalFlag, bool> experimentalFlags =
         SuiteFolderOptions.computeForcedExperimentalFlags(environment);
 
-    bool soundNullSafety = environment["soundNullSafety"] == "true";
-    bool ignoreExpectations = environment["ignoreExpectations"] == "true";
-    bool updateExpectations = environment[UPDATE_EXPECTATIONS] == "true";
-    bool updateComments = environment[UPDATE_COMMENTS] == "true";
-    bool skipVm = environment["skipVm"] == "true";
-    bool semiFuzz = environment["semiFuzz"] == "true";
-    bool verify = environment["verify"] != "false";
-    String? platformBinaries = environment["platformBinaries"];
+    bool soundNullSafety =
+        environment[EnvironmentKeys.soundNullSafety] == "true";
+    bool ignoreExpectations =
+        environment[EnvironmentKeys.ignoreExpectations] == "true";
+    bool updateExpectations =
+        environment[EnvironmentKeys.updateExpectations] == "true";
+    bool updateComments = environment[EnvironmentKeys.updateComments] == "true";
+    bool skipVm = environment[EnvironmentKeys.skipVm] == "true";
+    bool semiFuzz = environment[EnvironmentKeys.semiFuzz] == "true";
+    bool verify = environment[EnvironmentKeys.verify] != "false";
+    String? platformBinaries = environment[EnvironmentKeys.platformBinaries];
     if (platformBinaries != null && !platformBinaries.endsWith('/')) {
       platformBinaries = '$platformBinaries/';
     }
@@ -504,7 +502,7 @@
         updateComments,
         skipVm,
         semiFuzz,
-        compileModeFromName(environment[COMPILATION_MODE]),
+        compileModeFromName(environment[EnvironmentKeys.compilationMode]),
         verify,
         soundNullSafety));
   }
@@ -2114,7 +2112,7 @@
                       compilationSetup, sourceTarget),
                   context.expectationSet["InstrumentationMismatch"],
                   instrumentation.problemsAsString,
-                  autoFixCommand: '${UPDATE_COMMENTS}=true',
+                  autoFixCommand: '${EnvironmentKeys.updateComments}=true',
                   canBeFixWithUpdateExpectations: true);
             }
           }
diff --git a/pkg/front_end/test/fasta/textual_outline_suite.dart b/pkg/front_end/test/fasta/textual_outline_suite.dart
index 298c9ed..4bc6da1 100644
--- a/pkg/front_end/test/fasta/textual_outline_suite.dart
+++ b/pkg/front_end/test/fasta/textual_outline_suite.dart
@@ -24,8 +24,8 @@
 
 import '../utils/kernel_chain.dart' show MatchContext;
 import 'suite_utils.dart';
+import 'testing/environment_keys.dart';
 import 'testing/folder_options.dart';
-import 'testing/suite.dart' show UPDATE_EXPECTATIONS;
 
 const int minSupportedMajorVersion = 2;
 const int minSupportedMinorVersion = 12;
@@ -71,14 +71,16 @@
   final bool updateExpectations;
 
   @override
-  String get updateExpectationsOption => '${UPDATE_EXPECTATIONS}=true';
+  String get updateExpectationsOption =>
+      '${EnvironmentKeys.updateExpectations}=true';
 
   @override
   bool get canBeFixWithUpdateExpectations => true;
 
   Context(Uri baseUri, Map<String, String> environment)
       : suiteFolderOptions = new SuiteFolderOptions(baseUri),
-        updateExpectations = environment[UPDATE_EXPECTATIONS] == "true",
+        updateExpectations =
+            environment[EnvironmentKeys.updateExpectations] == "true",
         forcedExperimentalFlags =
             SuiteFolderOptions.computeForcedExperimentalFlags(environment);
 
diff --git a/pkg/front_end/test/fasta/weak_suite.dart b/pkg/front_end/test/fasta/weak_suite.dart
index 9630a0c..171095f 100644
--- a/pkg/front_end/test/fasta/weak_suite.dart
+++ b/pkg/front_end/test/fasta/weak_suite.dart
@@ -5,12 +5,14 @@
 library fasta.test.weak_suite;
 
 import 'suite_utils.dart' show internalMain;
+import 'testing/environment_keys.dart';
 import 'testing/suite.dart';
 
 Future<FastaContext> createContext(
     Chain suite, Map<String, String> environment) {
-  environment[COMPILATION_MODE] = CompileMode.full.name;
-  environment["semiFuzz"] ??= "true";
+  environment[EnvironmentKeys.compilationMode] = CompileMode.full.name;
+  environment[EnvironmentKeys.semiFuzz] ??= "true";
+  environment[EnvironmentKeys.skipVm] ??= "true";
   return FastaContext.create(suite, environment);
 }
 
diff --git a/pkg/front_end/test/incremental_suite.dart b/pkg/front_end/test/incremental_suite.dart
index d207742..41e6474 100644
--- a/pkg/front_end/test/incremental_suite.dart
+++ b/pkg/front_end/test/incremental_suite.dart
@@ -69,7 +69,7 @@
 
 import 'binary_md_dill_reader.dart' show DillComparer;
 import 'fasta/suite_utils.dart';
-import 'fasta/testing/suite.dart';
+import 'fasta/testing/environment_keys.dart';
 import "incremental_utils.dart" as util;
 import 'test_utils.dart';
 import 'testing_utils.dart' show checkEnvironment;
@@ -475,19 +475,20 @@
 
 Future<Context> createContext(Chain suite, Map<String, String> environment) {
   const Set<String> knownEnvironmentKeys = {
-    UPDATE_EXPECTATIONS,
-    "addDebugBreaks",
-    "skipTests",
+    EnvironmentKeys.updateExpectations,
+    EnvironmentKeys.addDebugBreaks,
+    EnvironmentKeys.skipTests,
   };
   checkEnvironment(environment, knownEnvironmentKeys);
 
   // Disable colors to ensure that expectation files are the same across
   // platforms and independent of stdin/stderr.
   colors.enableColors = false;
-  Set<String> skipTests = environment["skipTests"]?.split(",").toSet() ?? {};
+  Set<String> skipTests =
+      environment[EnvironmentKeys.skipTests]?.split(",").toSet() ?? {};
   return new Future.value(new Context(
-    environment[UPDATE_EXPECTATIONS] == "true",
-    environment["addDebugBreaks"] == "true",
+    environment[EnvironmentKeys.updateExpectations] == "true",
+    environment[EnvironmentKeys.addDebugBreaks] == "true",
     skipTests,
   ));
 }
diff --git a/pkg/front_end/test/outline_extractor_suite.dart b/pkg/front_end/test/outline_extractor_suite.dart
index e301e7b..ff75a28 100644
--- a/pkg/front_end/test/outline_extractor_suite.dart
+++ b/pkg/front_end/test/outline_extractor_suite.dart
@@ -16,7 +16,7 @@
     show Chain, ChainContext, ExpectationSet, Result, Step, TestDescription;
 
 import 'fasta/suite_utils.dart';
-import 'fasta/testing/suite.dart' show UPDATE_EXPECTATIONS;
+import 'fasta/testing/environment_keys.dart';
 import 'incremental_suite.dart' as helper;
 import 'testing_utils.dart' show checkEnvironment;
 import 'utils/kernel_chain.dart' show MatchContext;
@@ -42,11 +42,12 @@
 Future<Context> createContext(
     Chain suite, Map<String, String> environment) async {
   const Set<String> knownEnvironmentKeys = {
-    UPDATE_EXPECTATIONS,
+    EnvironmentKeys.updateExpectations,
   };
   checkEnvironment(environment, knownEnvironmentKeys);
 
-  bool updateExpectations = environment[UPDATE_EXPECTATIONS] == "true";
+  bool updateExpectations =
+      environment[EnvironmentKeys.updateExpectations] == "true";
 
   return new Context(suite.name, updateExpectations);
 }
@@ -56,7 +57,8 @@
   final bool updateExpectations;
 
   @override
-  String get updateExpectationsOption => '${UPDATE_EXPECTATIONS}=true';
+  String get updateExpectationsOption =>
+      '${EnvironmentKeys.updateExpectations}=true';
 
   @override
   bool get canBeFixWithUpdateExpectations => true;
diff --git a/pkg/front_end/test/parser_suite.dart b/pkg/front_end/test/parser_suite.dart
index 51aaf9d..052bf20b 100644
--- a/pkg/front_end/test/parser_suite.dart
+++ b/pkg/front_end/test/parser_suite.dart
@@ -31,7 +31,7 @@
     show Chain, ChainContext, ExpectationSet, Result, Step, TestDescription;
 
 import 'fasta/suite_utils.dart';
-import 'fasta/testing/suite.dart' show UPDATE_EXPECTATIONS;
+import 'fasta/testing/environment_keys.dart';
 import 'parser_test_listener.dart' show ParserTestListener;
 import 'parser_test_parser.dart' show TestParser;
 import 'testing_utils.dart' show checkEnvironment;
@@ -58,15 +58,16 @@
 Future<Context> createContext(
     Chain suite, Map<String, String> environment) async {
   const Set<String> knownEnvironmentKeys = {
-    UPDATE_EXPECTATIONS,
-    "trace",
-    "annotateLines"
+    EnvironmentKeys.updateExpectations,
+    EnvironmentKeys.trace,
+    EnvironmentKeys.annotateLines,
   };
   checkEnvironment(environment, knownEnvironmentKeys);
 
-  bool updateExpectations = environment[UPDATE_EXPECTATIONS] == "true";
-  bool trace = environment["trace"] == "true";
-  bool annotateLines = environment["annotateLines"] == "true";
+  bool updateExpectations =
+      environment[EnvironmentKeys.updateExpectations] == "true";
+  bool trace = environment[EnvironmentKeys.trace] == "true";
+  bool annotateLines = environment[EnvironmentKeys.annotateLines] == "true";
 
   return new Context(suite.name, updateExpectations, trace, annotateLines);
 }
@@ -102,7 +103,8 @@
   final bool updateExpectations;
 
   @override
-  String get updateExpectationsOption => '${UPDATE_EXPECTATIONS}=true';
+  String get updateExpectationsOption =>
+      '${EnvironmentKeys.updateExpectations}=true';
 
   @override
   bool get canBeFixWithUpdateExpectations => true;