diff --git a/tools/engine_tool/test/build_command_test.dart b/tools/engine_tool/test/build_command_test.dart
index a8a67d55f2a78..fdf1394a401f0 100644
--- a/tools/engine_tool/test/build_command_test.dart
+++ b/tools/engine_tool/test/build_command_test.dart
@@ -360,13 +360,12 @@ void main() {
         '//flutter/fml:fml_arc_unittests',
       ]);
       expect(result, equals(0));
-      expect(testEnv.processHistory.length, greaterThanOrEqualTo(2));
-      expect(testEnv.processHistory[6].command[0], contains('ninja'));
-      expect(testEnv.processHistory[6].command[2], endsWith('/host_debug'));
-      expect(
-        testEnv.processHistory[6].command[5],
-        equals('flutter/fml:fml_arc_unittests'),
-      );
+      expect(testEnv.processHistory, containsCommand((List<String> command) {
+        return command.length > 4 &&
+            command[0].contains('ninja') &&
+            command[2].endsWith('/host_debug') &&
+            command[5] == 'flutter/fml:fml_arc_unittests';
+      }));
     } finally {
       testEnv.cleanup();
     }
@@ -389,21 +388,14 @@ void main() {
         '//flutter/...',
       ]);
       expect(result, equals(0));
-      expect(testEnv.processHistory.length, greaterThanOrEqualTo(2));
-      expect(testEnv.processHistory[6].command[0], contains('ninja'));
-      expect(testEnv.processHistory[6].command[2], endsWith('/host_debug'));
-      expect(
-        testEnv.processHistory[6].command[5],
-        equals('flutter/display_list:display_list_unittests'),
-      );
-      expect(
-        testEnv.processHistory[6].command[6],
-        equals('flutter/flow:flow_unittests'),
-      );
-      expect(
-        testEnv.processHistory[6].command[7],
-        equals('flutter/fml:fml_arc_unittests'),
-      );
+      expect(testEnv.processHistory, containsCommand((List<String> command) {
+        return command.length > 7 &&
+            command[0].contains('ninja') &&
+            command[2].endsWith('/host_debug') &&
+            command[5] == 'flutter/display_list:display_list_unittests' &&
+            command[6] == 'flutter/flow:flow_unittests' &&
+            command[7] == 'flutter/fml:fml_arc_unittests';
+      }));
     } finally {
       testEnv.cleanup();
     }
diff --git a/tools/engine_tool/test/utils.dart b/tools/engine_tool/test/utils.dart
index a6955933c6c79..a5035a90673db 100644
--- a/tools/engine_tool/test/utils.dart
+++ b/tools/engine_tool/test/utils.dart
@@ -8,6 +8,7 @@ import 'dart:io' as io;
 import 'package:engine_repo_tools/engine_repo_tools.dart';
 import 'package:engine_tool/src/environment.dart';
 import 'package:engine_tool/src/logger.dart';
+import 'package:litetest/litetest.dart' show Expect, Matcher;
 import 'package:path/path.dart' as path;
 import 'package:platform/platform.dart';
 import 'package:process_fakes/process_fakes.dart';
@@ -169,3 +170,26 @@ FakeProcess _getCannedResult(
   }
   return FakeProcess();
 }
+
+typedef CommandMatcher = bool Function(List<String> command);
+
+/// Returns a [Matcher] that fails the test if no process has a matching command.
+///
+/// Usage:
+///    expect(testEnv.processHistory,
+///        containsCommand((List<String> command) {
+///            return command.length > 5 &&
+///                command[0].contains('ninja') &&
+///                command[2].endsWith('/host_debug') &&
+///                command[5] == 'flutter/fml:fml_arc_unittests';
+///        })
+///    );
+Matcher containsCommand(CommandMatcher commandMatcher) => (dynamic processes) {
+      Expect.type<List<ExecutedProcess>>(processes);
+      final List<List<String>> commands = (processes as List<ExecutedProcess>)
+          .map((ExecutedProcess process) => process.command)
+          .toList();
+      if (!commands.any(commandMatcher)) {
+        Expect.fail("No process found with matching command");
+      }
+    };