diff --git tests/phpunit/tests/ajax/DeleteComment.php tests/phpunit/tests/ajax/DeleteComment.php
index 97a2c02..ee7d257 100644
--- tests/phpunit/tests/ajax/DeleteComment.php
+++ tests/phpunit/tests/ajax/DeleteComment.php
@@ -26,12 +26,24 @@ class Tests_Ajax_DeleteComment extends WP_Ajax_UnitTestCase {
 	 */
 	public function setUp() {
 		parent::setUp();
+
+		// Turn off comment notifications for tests.
+		update_option( 'comments_notify', 0 );
+
 		$post_id = $this->factory->post->create();
 		$this->_comments = $this->factory->comment->create_post_comments( $post_id, 15 );
 		$this->_comments = array_map( 'get_comment', $this->_comments );
 	}
 
 	/**
+	 * Reset default settings.
+	 */
+	public function tearDown() {
+		// Turn comment notifications back on.
+		update_option( 'comments_notify', 1 );
+	}
+
+	/**
 	 * Clear the POST actions in between requests
 	 */
 	protected function _clear_post_action() {
diff --git tests/phpunit/tests/ajax/DimComment.php tests/phpunit/tests/ajax/DimComment.php
index d34b64d..1bfe33c 100644
--- tests/phpunit/tests/ajax/DimComment.php
+++ tests/phpunit/tests/ajax/DimComment.php
@@ -26,12 +26,24 @@ class Tests_Ajax_DimComment extends WP_Ajax_UnitTestCase {
 	 */
 	public function setUp() {
 		parent::setUp();
+
+		// Turn off comment notifications for tests.
+		update_option( 'comments_notify', 0 );
+
 		$post_id = $this->factory->post->create();
 		$this->_comments = $this->factory->comment->create_post_comments( $post_id, 15 );
 		$this->_comments = array_map( 'get_comment', $this->_comments );
 	}
 
 	/**
+	 * Reset default settings.
+	 */
+	public function tearDown() {
+		// Turn comment notifications back on.
+		update_option( 'comments_notify', 1 );
+	}
+
+	/**
 	 * Clear the POST actions in between requests
 	 */
 	protected function _clear_post_action() {
diff --git tests/phpunit/tests/ajax/ReplytoComment.php tests/phpunit/tests/ajax/ReplytoComment.php
index 7935bc2..4cea72c 100644
--- tests/phpunit/tests/ajax/ReplytoComment.php
+++ tests/phpunit/tests/ajax/ReplytoComment.php
@@ -32,6 +32,10 @@ class Tests_Ajax_ReplytoComment extends WP_Ajax_UnitTestCase {
 	 */
 	public function setUp() {
 		parent::setUp();
+
+		// Turn off comment notifications for tests.
+		update_option( 'comments_notify', 0 );
+
 		$post_id = $this->factory->post->create();
 		$this->factory->comment->create_post_comments( $post_id, 5 );
 		$this->_comment_post = get_post( $post_id );
@@ -43,6 +47,14 @@ class Tests_Ajax_ReplytoComment extends WP_Ajax_UnitTestCase {
 	}
 
 	/**
+	 * Reset default settings.
+	 */
+	public function tearDown() {
+		// Turn comment notifications back on.
+		update_option( 'comments_notify', 1 );
+	}
+
+	/**
 	 * Reply as a privilged user (administrator)
 	 * Expects test to pass
 	 * @return void