Add test for "--text php://stdout"

Author: sebastianbergmann

tests/end-to-end/merge/valid-directory-with-text-report-stdout.phpt

@@ -0,0 +1,29 @@
+--TEST--
+phpcov merge --text php://stdout ../../fixture/example/coverage
+--INI--
+xdebug.overload_var_dump=0
+--FILE--
+<?php declare(strict_types=1);
+require __DIR__ . '/../../../vendor/autoload.php';
+
+$_SERVER['argv'][1] = 'merge';
+$_SERVER['argv'][2] = '--text';
+$_SERVER['argv'][3] = 'php://stdout';
+$_SERVER['argv'][4] = __DIR__ . '/../../fixture/example/coverage';
+
+var_dump((new SebastianBergmann\PHPCOV\Application)->run($_SERVER['argv']));
+--EXPECTF--
+phpcov %s by Sebastian Bergmann.
+
+Generating code coverage report in text format ... 
+
+Code Coverage Report:   
+  %s   
+                        
+ Summary:               
+  Classes: 100.00% (1/1)
+  Methods: 100.00% (2/2)
+  Lines:   66.67% (2/3) 
+
+SebastianBergmann\PHPCOV\TestFixture\Greeter
+  Methods: 100.00% ( 2/ 2)   Lines: 100.00% (  2/  2)