JoseAlcerreca

plugins {
    ...
    jacoco
}


android {
    applicationVariants.all(closureOf<com.android.build.gradle.api.ApplicationVariant> {
        val myObjFactory = project.objects
        val buildDir = layout.buildDirectory.get().asFile

JoseAlcerreca

/*
 * Copyright 2023 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software

JoseAlcerreca

// Copyright 2022 Google LLC.
// SPDX-License-Identifier: Apache-2.0

fun waitUntilAtLeastOneExists(matcher: SemanticsMatcher, timeout: Long = 1000L)

fun waitUntilDoesNotExist(matcher: SemanticsMatcher, timeout: Long = 1000L)

fun waitUntilExactlyOneExists(matcher: SemanticsMatcher,  timeout: Long = 1000L)

fun waitUntilNodeCount(matcher: SemanticsMatcher, count: Int, timeout: Long = 1000L)

JoseAlcerreca

#!/bin/bash
#
# Copyright (C) 2022 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#

JoseAlcerreca

@Test
fun loginScreen_onContinueClick_welcomeDisplayed() {
    composeTestRule.onNodeWithText("Continue¨).performClick()

    composeTestRule.waitUntilDoesNotExist(hasText("Loading"))

    composeTestRule.onNodeWithText("Welcome").assertExists()
}

JoseAlcerreca

@Test
fun loginScreen_onContinueClick_welcomeDisplayed() {
    composeTestRule.onNodeWithText("Continue¨).performClick()

    // Screen still shows "Loading"

    composeTestRule.onNodeWithText("Welcome").assertExists()  // FAILS!
}

JoseAlcerreca

class MyViewModel(repository…) {
    val data = flow{
        ...
        emitAll(repository.observeData())
    }
}

JoseAlcerreca

@Composable
fun MyScreen(val viewModel: MyViewModel = viewModel()) {
    val data by viewModel.data.collectAsState("Loading")
    Text(greeting)
}

JoseAlcerreca

composeTestRule.waitUntilExactlyOneExists(hasText("Continue"))

JoseAlcerreca

// Copyright 2022 Google LLC.
// SPDX-License-Identifier: Apache-2.0

// UPDATE: These are not needed anymore.

fun ComposeContentTestRule.waitUntilExists(
    matcher: SemanticsMatcher,
    timeoutMillis: Long = 1_000L
) {
    return this.waitUntilNodeCount(matcher, 1, timeoutMillis)