How to enter text in Jetpack compose TextField through UI tests?

AndroidDev Published at Dev

AndroidDev

In Jetpack compose I have a TextField and I'm trying to write Espresso UI tests. I didn't find how I can enter text in the TextField, any ideas please?

        TextField(
            value = textState.value,
            modifier = Modifier.fillMaxWidth(),
            onValueChange = {
                textState.value = it
                apiServiceCall(textState.value.text)
            },
            keyboardOptions = KeyboardOptions(capitalization = KeyboardCapitalization.Sentences)
        )

@get:Rule
val composeTestRule = createAndroidComposeRule<MainActivity>()

@Test
fun enterTextAndMakeServiceCall() {
    ActivityScenario.launch(MainActivity::class.java)

    //TODO: Enter text inside the TextField
    composeTestRule.onNode(hasText(getString(R.string.result)))
}

jeprubio

I first set the testTag modifier on the composable I want to test:

const val MY_TEXTFIELD_TAG = "myTextFieldTag"

TextField(
    value = textState.value,
    modifier = Modifier.fillMaxWidth().testTag(MY_TEXTFIELD_TAG),
    onValueChange = {
        textState.value = it
    },
    keyboardOptions = KeyboardOptions(capitalization = KeyboardCapitalization.Sentences),
)

And then from your test you can set and check the value like this:

@Test
fun setAndCheckTheTextFieldValue() {
    ActivityScenario.launch(MainActivity::class.java)
    val resultText = "result"

    // Sets the TextField value
    composeTestRule.onNodeWithTag(MY_TEXTFIELD_TAG).performTextInput(resultText)

    // Asserts the TextField has the corresponding value
    composeTestRule.onNodeWithTag(MY_TEXTFIELD_TAG).assert(hasText(resultText))
}

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