diff --git a/src/Framework/TestCase.php b/src/Framework/TestCase.php
index ac6f087e9cf..6751c8472c6 100755
--- a/src/Framework/TestCase.php
+++ b/src/Framework/TestCase.php
@@ -1050,6 +1050,14 @@ public function setInIsolation($inIsolation)
         }
     }
 
+    /**
+     * @return boolean
+     */
+    public function isInIsolation()
+    {
+        return $this->inIsolation;
+    }
+
     /**
      * @return mixed
      * @since  Method available since Release 3.4.0
diff --git a/tests/Framework/TestCaseTest.php b/tests/Framework/TestCaseTest.php
index 337b00a7889..1a0f14bc13b 100644
--- a/tests/Framework/TestCaseTest.php
+++ b/tests/Framework/TestCaseTest.php
@@ -362,6 +362,25 @@ public function testStaticAttributesBackupPost()
         $this->assertSame(123, self::$_testStatic);
     }
 
+    public function testIsInIsolationReturnsFalse()
+    {
+        $test   = new IsolationTest('testIsInIsolationReturnsFalse');
+        $result = $test->run();
+
+        $this->assertEquals(1, count($result));
+        $this->assertTrue($result->wasSuccessful());
+    }
+
+    public function testIsInIsolationReturnsTrue()
+    {
+        $test   = new IsolationTest('testIsInIsolationReturnsTrue');
+        $test->setRunTestInSeparateProcess(true);
+        $result = $test->run();
+
+        $this->assertEquals(1, count($result));
+        $this->assertTrue($result->wasSuccessful());
+    }
+
     public function testExpectOutputStringFooActualFoo()
     {
         $test   = new OutputTestCase('testExpectOutputStringFooActualFoo');
diff --git a/tests/_files/IsolationTest.php b/tests/_files/IsolationTest.php
new file mode 100644
index 00000000000..df95c916826
--- /dev/null
+++ b/tests/_files/IsolationTest.php
@@ -0,0 +1,13 @@
+<?php
+class IsolationTest extends PHPUnit_Framework_TestCase
+{
+    public function testIsInIsolationReturnsFalse()
+    {
+        $this->assertFalse($this->isInIsolation());
+    }
+
+    public function testIsInIsolationReturnsTrue()
+    {
+        $this->assertTrue($this->isInIsolation());
+    }
+}