PhpStorm 2018.2 comes with an extra level of flexibility for working with PHPUnit tests. Previously, you could run either a single method in a class, or all methods at once. Now, PhpStorm also lets you run an arbitrary selection of tests.
To get started, right-click your test target, that is, a class or a method being tested, and invoke Go To | Test or press Control+Shift+T (⇧⌘T for macOS). Then, select several tests to be executed by using Ctrl (⌘ for macOS) and Shift keys.
To run your selection, use the provided keyboard shortcut (Control+Shift+F10 for Windows and ⌃⇧R for macOS):