Write test cases in canonical order

java/pom.xml

@@ -67,6 +67,13 @@
             <version>[14.0.1,15.0.0)</version>
         </dependency>
 
+        <dependency>
+            <groupId>io.cucumber</groupId>
+            <artifactId>compatibility-kit</artifactId>
+            <version>23.2.0</version>
+            <scope>test</scope>
+        </dependency>
+
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>

java/src/test/java/io/cucumber/testngxmlformatter/MessagesToTestngXmlWriterAcceptanceTest.java

@@ -1,5 +1,6 @@
 package io.cucumber.testngxmlformatter;
 
+import io.cucumber.compatibilitykit.MessageOrderer;
 import io.cucumber.messages.NdjsonToMessageIterable;
 import io.cucumber.messages.types.Envelope;
 import org.junit.jupiter.api.Disabled;
@@ -15,9 +16,11 @@
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;
-import java.util.Objects;
+import java.util.Random;
+import java.util.function.Consumer;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
@@ -26,6 +29,8 @@
 
 class MessagesToTestngXmlWriterAcceptanceTest {
     private static final NdjsonToMessageIterable.Deserializer deserializer = (json) -> OBJECT_MAPPER.readValue(json, Envelope.class);
+    private static final Random random = new Random(202509282040L);
+    private static final MessageOrderer messageOrderer = new MessageOrderer(random);
 
     static List<TestCase> acceptance() throws IOException {
         try (Stream<Path> paths = Files.list(Paths.get("../testdata/src"))) {
@@ -40,31 +45,49 @@ static List<TestCase> acceptance() throws IOException {
     @ParameterizedTest
     @MethodSource("acceptance")
     void test(TestCase testCase) throws IOException {
-        ByteArrayOutputStream bytes = writeTestngXmlReport(testCase, new ByteArrayOutputStream());
+        ByteArrayOutputStream bytes = writeTestngXmlReport(testCase, messageOrderer.originalOrder());
         Source expected = Input.fromPath(testCase.expected).build();
         Source actual = Input.fromByteArray(bytes.toByteArray()).build();
         assertThat(actual).and(expected).ignoreWhitespace().areIdentical();
     }
 
+    @ParameterizedTest
+    @MethodSource("acceptance")
+    void testWithSimulatedParallelExecution(TestCase testCase) throws IOException {
+        ByteArrayOutputStream actual = writeTestngXmlReport(testCase, messageOrderer.simulateParallelExecution());
+        byte[] expected = Files.readAllBytes(testCase.expected);
+        assertThat(actual).and(expected).ignoreWhitespace().areIdentical();
+    }
+
     @ParameterizedTest
     @MethodSource("acceptance")
     @Disabled
     void updateExpectedFiles(TestCase testCase) throws IOException {
         try (OutputStream out = Files.newOutputStream(testCase.expected)) {
-            writeTestngXmlReport(testCase, out);
+            writeTestngXmlReport(testCase, out, messageOrderer.originalOrder());
         }
     }
 
-    private static <T extends OutputStream> T writeTestngXmlReport(TestCase testCase, T out) throws IOException {
+    private static ByteArrayOutputStream writeTestngXmlReport(TestCase testCase, Consumer<List<Envelope>> orderer) throws IOException {
+        return writeTestngXmlReport(testCase, new ByteArrayOutputStream(), orderer);
+    }
+
+    private static <T extends OutputStream> T writeTestngXmlReport(TestCase testCase, T out, Consumer<List<Envelope>> orderer) throws IOException {
+        List<Envelope> messages = new ArrayList<>();
         try (InputStream in = Files.newInputStream(testCase.source)) {
             try (NdjsonToMessageIterable envelopes = new NdjsonToMessageIterable(in, deserializer)) {
-                try (MessagesToTestngXmlWriter writer = new MessagesToTestngXmlWriter(out)) {
-                    for (Envelope envelope : envelopes) {
-                        writer.write(envelope);
-                    }
+                for (Envelope envelope : envelopes) {
+                    messages.add(envelope);
                 }
             }
         }
+        orderer.accept(messages);
+
+        try (MessagesToTestngXmlWriter writer = new MessagesToTestngXmlWriter(out)) {
+            for (Envelope envelope : messages) {
+                writer.write(envelope);
+            }
+        }
         return out;
     }
 
@@ -86,18 +109,6 @@ public String toString() {
             return name;
         }
 
-        @Override
-        public boolean equals(Object o) {
-            if (this == o) return true;
-            if (o == null || getClass() != o.getClass()) return false;
-            TestCase testCase = (TestCase) o;
-            return source.equals(testCase.source);
-        }
-
-        @Override
-        public int hashCode() {
-            return Objects.hash(source);
-        }
     }
 
 }