Testing UI of IntelliJ Plugins

by Paweł Lipski (GitHub: PawelLipski)

gradle runIdeForUiTest

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Similar to good old `gradle runIde`...

..but an extra plugin is added to the IntelliJ instance:

JetBrains/intellij-ui-test-robot

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Quick demo: runIdeForUiTests

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Locators: byXpath

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Locator loginToGitHubLocator =
  byXpath(
    "//div[@class='MainButton' and @text='Log in to GitHub']"
  );

ComponentFixture loginToGitHub =
  remoteRobot.find(
    ComponentFixture.class,
    loginToGitHubLocator
  );

runJs/callJs

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// `robot` and `component` are available out of the box

loginToGitHub.runJs(
   """
     const offset = component.getHeight() / 2;
     robot.click(component, new Point(offset, offset),
       MouseButton.LEFT_BUTTON, 1);
   """
)

JavaScript or Java? Rhino

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      importClass(com.intellij.diagnostic.DebugLogManager);

      importClass(java.util.Stream);

      const logCategories = Stream.of(
        'gitmachete.backend',
        'gitmachete.frontend.actions',
        'gitmachete.frontend.graph',
        'gitmachete.frontend.ui'
      ).map(function (name) {
        return new DebugLogManager.Category(name,

          DebugLogManager.DebugLogLevel.DEBUG);
      }).collect(Collectors.toList());

Keep state b/w runJs/callJs's

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runJs("greeting = 'Hello from Idea'");

// ....

runJs("java.lang.System.out.println(greeting)");

// WHOOPS the variables aren't kept between invocations

Keep state b/w runJs/callJs's

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runJs("global.put('greeting', 'Hello from Idea')")

// ....

assert(callJs<String>("global.get('greeting')") == "Hello from Idea")

How to run in CI?

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Problem: there's no physical display available

to the VMs/Docker containers running in the CI...

Xvfb

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Xvfb is an X server that can run on machines with no display hardware and no physical input devices. It emulates a dumb framebuffer using virtual memory.

Note that in X-speak, server corresponds to a display,

while client corresponds to an application

(unlike with e.g. remote desktops!)

xvfb-run

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# Debian-like systems:
$ apt-get install libx11-6 libxrender1 libxtst6 xauth xvfb

See a sample Dockerfile

xvfb-run

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$ xvfb-run pstree
....

        ├─gnome-terminal───bash───xvfb-run─┬─Xvfb───8*[{Xvfb}]
        │                                  └─pstree

....

VirtusLab/ide-probe

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Run the given version of IntelliJ programatically, directly from test code

(rather than via a separate

`gradle runIdeForUiTests` invocation)

VirtusLab/ide-probe

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Quick demo:

run an actual UI test

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./scripts/run-ui-tests 2021.1.2 discoverBranchLayout

GitHub: VirtusLab/git-machete-intellij-plugin

Questions?

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