added withErrorReporting helper

src/TestSuite/TestCase.php

@@ -87,6 +87,24 @@ public function skipIf($shouldSkip, $message = '')
         return $shouldSkip;
     }
 
+    /**
+     * Helper method for tests that needs to use error_reporting()
+     *
+     * @param int $errorLevel value of error_reporting() that needs to use
+     * @param callable $callable callable function that will receive asserts
+     * @return void
+     */
+    public function withErrorReporting($errorLevel, $callable)
+    {
+        try {
+            $default = error_reporting();
+            error_reporting($errorLevel);
+            $callable();
+        } finally {
+            error_reporting($default);
+        }
+    }
+
     /**
      * Helper method for check deprecation methods
      *

tests/TestCase/TestSuite/TestCaseTest.php

@@ -175,6 +175,38 @@ public function testSkipIf()
         $this->assertEquals(0, $result->skippedCount());
     }
 
+    /**
+     * test withErrorReporting
+     *
+     * @return void
+     */
+    public function testWithErrorReporting()
+    {
+        $errorLevel = error_reporting();
+        $this->withErrorReporting(E_USER_WARNING, function () {
+              $this->assertSame(E_USER_WARNING, error_reporting());
+        });
+        $this->assertSame($errorLevel, error_reporting());
+    }
+
+    /**
+     * test withErrorReporting with exceptions
+     *
+     * @expectedException \PHPUnit\Framework\AssertionFailedError
+     * @return void
+     */
+    public function testWithErrorReportingWithException()
+    {
+        $errorLevel = error_reporting();
+        try {
+            $this->withErrorReporting(E_USER_WARNING, function () {
+                $this->assertSame(1, 2);
+            });
+        } finally {
+            $this->assertSame($errorLevel, error_reporting());
+        }
+    }
+
     /**
      * testDeprecated
      *