diff --git a/example/phpunit.all.xml b/example/phpunit.all.xml
index 02a047d51..9df3e7b43 100644
--- a/example/phpunit.all.xml
+++ b/example/phpunit.all.xml
@@ -36,5 +36,6 @@
         <env name="PACT_CONSUMER_TAG" value="master"/>
         <env name="PACT_PROVIDER_NAME" value="someProvider"/>
         <env name="PACT_OUTPUT_DIR" value=".\example\output\\"/>
+        <env name="PACT_FILE_WRITE_MODE" value="merge"/>
     </php>
 </phpunit>
diff --git a/example/phpunit.consumer.xml b/example/phpunit.consumer.xml
index 0e521db3e..4c076cf92 100644
--- a/example/phpunit.consumer.xml
+++ b/example/phpunit.consumer.xml
@@ -25,5 +25,6 @@
         <env name="PACT_PROVIDER_NAME" value="someProvider"/>
         <env name="PACT_OUTPUT_DIR" value=".\example\output"/>
         <!-- <env name="PACT_BROKER_URI" value="http://localhost"/> -->
+        <env name="PACT_FILE_WRITE_MODE" value="merge"/>
     </php>
 </phpunit>
diff --git a/example/phpunit.core.xml b/example/phpunit.core.xml
index 57e6e2e40..5e9ed2010 100644
--- a/example/phpunit.core.xml
+++ b/example/phpunit.core.xml
@@ -24,5 +24,6 @@
         <env name="PACT_CONSUMER_TAG" value="master"/>
         <env name="PACT_PROVIDER_NAME" value="someProvider"/>
         <env name="PACT_OUTPUT_DIR" value=".\example\output\\"/>
+        <env name="PACT_FILE_WRITE_MODE" value="merge"/>
     </php>
 </phpunit>
diff --git a/src/PhpPact/Consumer/Listener/PactTestListener.php b/src/PhpPact/Consumer/Listener/PactTestListener.php
index 6e25ccbf2..edb39aa16 100644
--- a/src/PhpPact/Consumer/Listener/PactTestListener.php
+++ b/src/PhpPact/Consumer/Listener/PactTestListener.php
@@ -7,6 +7,7 @@
 use PhpPact\Standalone\Broker\Broker;
 use PhpPact\Standalone\Broker\BrokerConfig;
 use PhpPact\Standalone\MockService\MockServerEnvConfig;
+use PhpPact\Standalone\PactConfigInterface;
 use PHPUnit\Framework\AssertionFailedError;
 use PHPUnit\Framework\Test;
 use PHPUnit\Framework\TestListener;
@@ -49,6 +50,25 @@ public function __construct(array $testSuiteNames)
         $this->mockServerConfig = new MockServerEnvConfig();
     }
 
+    /**
+     * @param TestSuite $suite
+     *
+     * @throws \Exception
+     */
+    public function startTestSuite(TestSuite $suite): void
+    {
+        if (
+            \in_array($suite->getName(), $this->testSuiteNames) &&
+            $this->mockServerConfig->getPactFileWriteMode() === PactConfigInterface::MODE_MERGE
+        ) {
+            file_put_contents('/home/tien/Downloads/test.txt', 'deleted');
+            $consumer = $this->mockServerConfig->getConsumer();
+            $provider = $this->mockServerConfig->getProvider();
+            $pactDir = $this->mockServerConfig->getPactDir();
+            unlink($pactDir . \DIRECTORY_SEPARATOR . "{$consumer}-{$provider}.json");
+        }
+    }
+
     public function addError(Test $test, \Throwable $t, float $time): void
     {
         $this->failed = true;
diff --git a/src/PhpPact/Standalone/MockService/MockServerEnvConfig.php b/src/PhpPact/Standalone/MockService/MockServerEnvConfig.php
index 1f11a8a84..4621f33a8 100644
--- a/src/PhpPact/Standalone/MockService/MockServerEnvConfig.php
+++ b/src/PhpPact/Standalone/MockService/MockServerEnvConfig.php
@@ -39,6 +39,10 @@ public function __construct()
         }
 
         $this->setPactSpecificationVersion($version);
+
+        if ($writeMode = $this->parseEnv('PACT_FILE_WRITE_MODE', false)) {
+            $this->setPactFileWriteMode($writeMode);
+        }
     }
 
     /**
diff --git a/src/PhpPact/Standalone/PactConfig.php b/src/PhpPact/Standalone/PactConfig.php
index e5a526f9b..dd195b128 100644
--- a/src/PhpPact/Standalone/PactConfig.php
+++ b/src/PhpPact/Standalone/PactConfig.php
@@ -57,7 +57,7 @@ class PactConfig implements PactConfigInterface
      *
      * @var string
      */
-    private string $pactFileWriteMode = self::MODE_OVERWRITE;
+    private string $pactFileWriteMode = self::MODE_MERGE;
 
     /**
      * {@inheritdoc}