diff --git a/packages/flutter_tools/test/integration.shard/isolated/native_assets_test.dart b/packages/flutter_tools/test/integration.shard/isolated/native_assets_test.dart
index a28620fa04d..cd9b0ce9b20 100644
--- a/packages/flutter_tools/test/integration.shard/isolated/native_assets_test.dart
+++ b/packages/flutter_tools/test/integration.shard/isolated/native_assets_test.dart
@@ -72,7 +72,7 @@ void main() {
             <String>['run', '-d$device', '--$buildMode'],
             exampleDirectory.path,
             <Transition>[
-              Multiple(
+              Multiple.contains(
                 <Pattern>['Flutter run key commands.'],
                 handler: (String line) {
                   if (buildMode == 'debug') {
@@ -85,7 +85,7 @@ void main() {
                 },
               ),
               if (buildMode == 'debug') ...<Transition>[
-                Barrier('Performing hot reload...'.padRight(progressMessageWidth), logging: true),
+                Barrier.contains('Performing hot reload...', logging: true),
                 Multiple(
                   <Pattern>[RegExp('Reloaded .*')],
                   handler: (String line) {
@@ -93,7 +93,7 @@ void main() {
                     return 'R';
                   },
                 ),
-                Barrier('Performing hot restart...'.padRight(progressMessageWidth)),
+                Barrier.contains('Performing hot restart...'),
                 Multiple(
                   <Pattern>[RegExp('Restarted application .*')],
                   handler: (String line) {
@@ -101,7 +101,7 @@ void main() {
                     return 'r';
                   },
                 ),
-                Barrier('Performing hot reload...'.padRight(progressMessageWidth), logging: true),
+                Barrier.contains('Performing hot reload...', logging: true),
                 Multiple(
                   <Pattern>[RegExp('Reloaded .*')],
                   handler: (String line) {
@@ -109,7 +109,7 @@ void main() {
                   },
                 ),
               ],
-              const Barrier('Application finished.'),
+              Barrier.contains('Application finished.'),
             ],
             logging: false,
           );
diff --git a/packages/flutter_tools/test/integration.shard/overall_experience_test.dart b/packages/flutter_tools/test/integration.shard/overall_experience_test.dart
index cbfbdc64152..a2609aa2035 100644
--- a/packages/flutter_tools/test/integration.shard/overall_experience_test.dart
+++ b/packages/flutter_tools/test/integration.shard/overall_experience_test.dart
@@ -56,7 +56,7 @@ void main() {
                 return 'q';
               },
             ),
-            const Barrier('Application finished.'),
+            Barrier('Application finished.'),
           ],
         );
         expect(existsDuringTest, isNot(isNull));
@@ -136,7 +136,7 @@ void main() {
               return 'q';
             },
           ),
-          const Barrier('Application finished.'),
+          Barrier('Application finished.'),
         ],
         logging:
             false, // we ignore leading log lines to avoid making this test sensitive to e.g. the help message text
@@ -232,7 +232,7 @@ void main() {
               return 'q';
             },
           ),
-          const Barrier('Application finished.'),
+          Barrier('Application finished.'),
         ],
         logging:
             false, // we ignore leading log lines to avoid making this test sensitive to e.g. the help message text
@@ -391,7 +391,7 @@ void main() {
             return 'q';
           },
         ),
-        const Barrier('Application finished.'),
+        Barrier('Application finished.'),
       ],
     );
     expect(result.exitCode, 0);
diff --git a/packages/flutter_tools/test/integration.shard/transition_test_utils.dart b/packages/flutter_tools/test/integration.shard/transition_test_utils.dart
index 0a0dc8931f1..73f219ac839 100644
--- a/packages/flutter_tools/test/integration.shard/transition_test_utils.dart
+++ b/packages/flutter_tools/test/integration.shard/transition_test_utils.dart
@@ -43,48 +43,56 @@ abstract class Transition {
   bool matches(String line);
 
   @protected
-  bool lineMatchesPattern(String line, Pattern pattern) {
-    if (pattern is String) {
-      return line == pattern;
+  bool lineMatchesPattern(String line, Pattern pattern, bool contains) {
+    if (pattern is RegExp) {
+      // Ideally this would also distinguish between "contains" and "equals"
+      // operation.
+      return line.contains(pattern);
     }
-    return line.contains(pattern);
+    return contains ? line.contains(pattern) : line == pattern;
   }
 
   @protected
-  String describe(Pattern pattern) {
-    if (pattern is String) {
-      return '"$pattern"';
-    }
+  String describe(Pattern pattern, bool contains) {
     if (pattern is RegExp) {
       return '/${pattern.pattern}/';
     }
-    return '$pattern';
+    return contains ? '"...$pattern..."' : '"$pattern"';
   }
 }
 
 class Barrier extends Transition {
-  const Barrier(this.pattern, {super.handler, super.logging});
+  Barrier(this.pattern, {super.handler, super.logging}) : contains = false;
+  Barrier.contains(this.pattern, {super.handler, super.logging}) : contains = true;
+
   final Pattern pattern;
+  final bool contains;
 
   @override
-  bool matches(String line) => lineMatchesPattern(line, pattern);
+  bool matches(String line) => lineMatchesPattern(line, pattern, contains);
 
   @override
-  String toString() => describe(pattern);
+  String toString() => describe(pattern, contains);
 }
 
 class Multiple extends Transition {
   Multiple(List<Pattern> patterns, {super.handler, super.logging})
     : _originalPatterns = patterns,
-      patterns = patterns.toList();
+      patterns = patterns.toList(),
+      contains = false;
+  Multiple.contains(List<Pattern> patterns, {super.handler, super.logging})
+    : _originalPatterns = patterns,
+      patterns = patterns.toList(),
+      contains = true;
 
   final List<Pattern> _originalPatterns;
   final List<Pattern> patterns;
+  final bool contains;
 
   @override
   bool matches(String line) {
     for (int index = 0; index < patterns.length; index += 1) {
-      if (lineMatchesPattern(line, patterns[index])) {
+      if (lineMatchesPattern(line, patterns[index], contains)) {
         patterns.removeAt(index);
         break;
       }
@@ -94,6 +102,7 @@ class Multiple extends Transition {
 
   @override
   String toString() {
+    String describe(Pattern pattern) => super.describe(pattern, contains);
     if (patterns.isEmpty) {
       return '${_originalPatterns.map(describe).join(', ')} (all matched)';
     }