11 April 2024 Leave a comment Tech-Help
When conducting UI tests in Jetpack Compose, it’s essential to simulate user interactions accurately. One common task is entering text into a TextField. This article provides a step-by-step guide on how to achieve this, ensuring your tests are effective and your code remains robust.
Setting Up a Test Environment for TextFields
To begin testing, you need to set up your TextField in a way that the UI testing framework can interact with it. Here’s an example of how to define a TextField in Jetpack Compose with a test tag:
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),
)
Writing the Test to Enter Text
With the test tag in place, you can now write a test function to set and verify the text input:
@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))
}
Alternative Method: Using Content Description
Another approach to identifying the TextField in UI tests is by utilizing content descriptions, which has the added benefit of making your app more accessible:
@Composable
fun MyTextField() {
val textState = remember { mutableStateOf(TextFieldValue()) }
val textFieldContentDescription = stringResource(id = R.string.text_field_content_description)
TextField(
value = textState.value,
modifier = Modifier
.fillMaxWidth()
.semantics { contentDescription = textFieldContentDescription },
onValueChange = {
textState.value = it
},
)
}
@Test
fun setAndCheckTheTextFieldValue() {
lateinit var textFieldContentDescription: String
composeTestRule.setContent {
textFieldContentDescription = stringResource(id = R.string.text_field_content_description)
MaterialTheme {
MyTextField()
}
}
val resultText = "result"
// Sets the TextField value
composeTestRule.onNodeWithContentDescription(textFieldContentDescription).performTextInput(resultText)
// Asserts the TextField has the corresponding value
composeTestRule.onNodeWithContentDescription(textFieldContentDescription).assert(hasText(resultText, ignoreCase = true))
}
Conclusion
By following the methods outlined above, you can effectively automate text input in Jetpack Compose TextFields during UI testing. Whether you choose to use test tags or content descriptions, both methods provide a reliable way to ensure your TextField components function as expected under user interaction scenarios.
