Fix tests on Linux (Ubuntu 16.4/Php7)

tests/ModbusMaster/MockServerTestCase.php

@@ -23,6 +23,11 @@ abstract class MockServerTestCase extends TestCase
                 $clientData[] = $output;
             });
 
+            if ('WIN' !== strtoupper(substr(PHP_OS, 0, 3))) {
+                // wait to spin up. needed for linux. unnessecary on Windows 10.
+                // Ugly but even with 150ms sleep test run faster on Linux
+                usleep(150000);
+            }
             $closure($port);
         });
 

tests/ModbusMaster/ModbusExceptionTest.php

@@ -21,7 +21,7 @@ class ModbusExceptionTest extends MockServerTestCase
     public function testPortClosedException()
     {
         $this->expectException(IOException::class);
-        $this->expectExceptionMessage('socket_connect() failed. Reason: ()No connection could be made because the target machine actively refused it.');
+        $this->expectExceptionMessage('socket_connect() failed. Reason:');
 
         $modbus = new ModbusMasterTcp('127.0.0.1');
         $modbus->setSocketTimeout(0.2, 0.2);