Update to Drupal 8.2.2. For more information, see https://www.drupal.org/project/drupal/releases/8.2.2

core/lib/Drupal/Core/Test/TestStatus.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace Drupal\Core\Test;
+
+/**
+ * Consolidates test result status information.
+ *
+ * For our test runners, a $status of 0 = passed test, 1 = failed test,
+ * 2 = exception, >2 indicates segfault timeout, or other type of system
+ * failure.
+ */
+class TestStatus {
+
+  /**
+   * Signify that the test result was a passed test.
+   */
+  const PASS = 0;
+
+  /**
+   * Signify that the test result was a failed test.
+   */
+  const FAIL = 1;
+
+  /**
+   * Signify that the test result was an exception or code error.
+   *
+   * This means that the test runner was able to exit and report an error.
+   */
+  const EXCEPTION = 2;
+
+  /**
+   * Signify a system error where the test runner was unable to complete.
+   *
+   * Note that SYSTEM actually represents the lowest value of system errors, and
+   * the returned value could be as high as 127. Since that's the case, this
+   * constant should be used for range comparisons, and not just for equality.
+   *
+   * @see http://php.net/manual/en/pcntl.constants.php
+   */
+  const SYSTEM = 3;
+
+  /**
+   * Turns a status code into a human-readable string.
+   *
+   * @param int $status
+   *   A test runner return code.
+   *
+   * @return string
+   *   The human-readable version of the status code.
+   */
+  public static function label($status) {
+    $statusMap = [
+      static::PASS => 'pass',
+      static::FAIL => 'fail',
+      static::EXCEPTION => 'exception',
+      static::SYSTEM => 'error',
+    ];
+    // For status 3 and higher, we want 'error.'
+    $label = $statusMap[$status > static::SYSTEM ? static::SYSTEM : $status];
+    return $label;
+  }
+
+}