Index: tests/phpunit/tests/user.php
--- tests/phpunit/tests/user.php Base (BASE)
+++ tests/phpunit/tests/user.php Locally Modified (Based On LOCAL)
@@ -699,4 +699,51 @@
 		$user = get_userdata( $user->ID );
 		$this->assertEmpty( $user->user_activation_key );
 	}
+	/**
+	 * @ticket 32158
+	 */
+	function test_email_case() {
+		// Create a test user with a lower-case email address.
+		$user_id	 = $this->factory->user->create( array(
+			'role'		 => 'author',
+			'user_login' => 'test_wp_update_user',
+			'user_pass'	 => 'password',
+			'user_email' => 'test@test.com',
+		) );
+		// Alter the case of the email address (which stays the same).
+		$userdata	 = array(
+			'ID'		 => $user_id,
+			'user_email' => 'test@TEST.com',
+		);
+		$update		 = wp_update_user( $userdata );
+
+		$this->assertFalse( is_wp_error( $update ) );
 }
+	
+	/**
+	 * @ticket 32158
+	 */
+	function test_email_change() {
+		// Create a test user.
+		$user_id	 = $this->factory->user->create( array(
+			'role'		 => 'author',
+			'user_login' => 'test_wp_update_user',
+			'user_pass'	 => 'password',
+			'user_email' => 'test@test.com',
+		) );
+		// Change the email address.
+		$userdata	 = array(
+			'ID'		 => $user_id,
+			'user_email' => 'test2@test.com',
+		);
+		$update		 = wp_update_user( $userdata );
+		
+		// Was this successful?
+		$this->assertFalse( is_wp_error( $update ) );
+
+		$user = get_userdata( $user_id );
+		// Verify that the email address has been updated.
+		$this->assertEquals( $user->user_email, 'test2@test.com' );
+	}
+
+}