I'm writing Playwright tests with Kotlin and I define the Browser and the Page in my BaseTest class ...

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[Vitali Plagov]

I'm writing Playwright tests with Kotlin and I define the Browser and the Page in my BaseTest class to be created before each test. Like this

open class BaseTest {

    lateinit var browser: Browser
    lateinit var page: Page

    @BeforeEach
    fun setUp() {
        browser = Playwright.create().chromium().launch()
        page = browser.newPage()
    }
}

But I don't like to use a mutable lateinit var modifiers. How can I turn these two into immutable variables? Using lazy? But then the variable will be initialized only once.

[Sam]

Immutable always implies initialized only once. For tests I normally just tolerate lateinit variables, even though I wouldn’t use them elsewhere. But an alternative would be to use a higher-order-function to do the test setup, something like this:

class TestSuite {
    private fun withPage(block: (Page) -> Unit) {
        val browser = Playwright.create().chromium().launch()
        val page = browser.newPage()
        block(page)
    }
    
    @Test
    fun myTest() = withPage { page ->
        doStuffWith(page)
    }
}

[Vitali Plagov]

Thank you! Looks interesting. I will consider this!