Print previous exception in Testdox

Author: staabm

src/TextUI/Output/TestDox/ResultPrinter.php

@@ -250,11 +250,37 @@ private function printThrowable(TestStatus $status, Throwable $throwable): void
             } else {
                 $tracePrefix = $this->prefixFor('trace', $status);
             }
+        }
 
+        if ($stackTrace !== '') {
             $this->printer->print(
                 $this->prefixLines($tracePrefix, PHP_EOL . $stackTrace),
             );
         }
+
+        if ($throwable->hasPrevious()) {
+            $this->printer->print(PHP_EOL);
+
+            $this->printer->print(
+                $this->prefixLines(
+                    $tracePrefix,
+                    ' ',
+                ),
+            );
+
+            $this->printer->print(PHP_EOL);
+
+            $this->printer->print(
+                $this->prefixLines(
+                    $tracePrefix,
+                    'Caused by:',
+                ),
+            );
+
+            $this->printer->print(PHP_EOL);
+
+            $this->printThrowable($status, $throwable->previous());
+        }
     }
 
     /**

tests/end-to-end/logging/_files/ThrowsWithPreviousExceptionTest.php

@@ -0,0 +1,24 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of PHPUnit.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace PHPUnit\TestFixture;
+
+use Exception;
+use PHPUnit\Framework\TestCase;
+
+class ThrowsWithPreviousExceptionTest extends TestCase
+{
+    public function testFoo(): void
+    {
+        throw new Exception(
+            'Outer',
+            previous: new Exception('Inner'),
+        );
+    }
+}

tests/end-to-end/logging/testdox/testdox-print-previous-exception.phpt

@@ -0,0 +1,37 @@
+--TEST--
+Testdox: print error message
+--FILE--
+<?php declare(strict_types=1);
+$_SERVER['argv'][] = '--display-errors';
+$_SERVER['argv'][] = '--do-not-cache-result';
+$_SERVER['argv'][] = '--no-configuration';
+$_SERVER['argv'][] = '--testdox';
+$_SERVER['argv'][] =  __DIR__ . '/../_files/ThrowsWithPreviousExceptionTest.php';
+
+require_once __DIR__ . '/../../../bootstrap.php';
+
+(new PHPUnit\TextUI\Application)->run($_SERVER['argv']);
+--EXPECTF--
+PHPUnit %s by Sebastian Bergmann and contributors.
+
+Runtime:       PHP %s
+
+E                                                                   1 / 1 (100%)
+
+Time: %s, Memory: %s
+
+Throws With Previous Exception (PHPUnit\TestFixture\ThrowsWithPreviousException)
+ ✘ Foo
+   │
+   │ Exception: Outer
+   │
+   │ %sThrowsWithPreviousExceptionTest.php:%d
+   │  
+   │ Caused by:
+   │ Exception: Inner
+   │
+   │ %sThrowsWithPreviousExceptionTest.php:%d
+   │
+
+ERRORS!
+Tests: 1, Assertions: 0, Errors: 1.