Latte

Latte is a lightweight and easy to use UI testing framework for Android utilizing Kotlin DSL.

Features

• Has a very small footprint
• Is a standalone framework
• Utilizes Kotlin DSL
• Uses Android API for matching, interactions and verifications
• Narrows the scope of matches, interactions and verifications to a given type of View
• Enables easy debugging of View's current state
• Gives a fine grained control over view matching process
• Provides a separate library artifact with helper interactions and verifications

Requirements

• Minimum Android SDK: 21
• Compile Android SDK: 34 or later

Setup

In {root}/build.gradle add:

allprojects {
    repositories {
        maven {
            url "https://maven.pkg.github.com/malloth/latte"
        }
    }
}

In {module}/build.gradle add:

dependencies {
    androidTestImplementation "pl.codesamurai.latte:core:{LATEST_VERSION}"
    androidTestImplementation "pl.codesamurai.latte:core-ktx:{LATEST_VERSION}"
}

For current {LATEST_VERSION} please check GitHub's releases tab.

Usage

Matching View of a specific type:

val viewMatcher: (View) -> Boolean = { /* matching view's conditions */ }

match(viewMatcher)

Ensuring that no matching Views exists in the view hierarchy:

val viewMatcher: (View) -> Boolean = { /* matching view's conditions */ }

noMatch(viewMatcher)

Performing actions with matched View:

val viewMatcher: (View) -> Boolean = { /* matching view's conditions */ }

match(viewMatcher) {
    // actions performed on a view(s)
}

Verifying View's expected state:

val viewMatcher: (View) -> Boolean = { /* matching view's conditions */ }

match(viewMatcher) {
    verify {
        // assertion(s) performed on a view(s)
    }
}

or

// GIVEN
val viewMatcher: (View) -> Boolean = { /* matching view's conditions */ }

// WHEN
val matching = match(viewMatcher) {
    // actions performed on a view(s)
}

// THEN
matching.verify {
    // assertion(s) performed on a view(s)
}

Sample use case matching EditText with an id R.id.edit1:

// GIVEN
val editTextWithId: (EditText) -> Boolean = { id == R.id.edit1 }

// WHEN
val matching = match(editTextWithId) {
    tap()
    type("123")
}

// THEN
matching.verify {
    isFocused && hasText("123")
}

Sample

Inside this repository there's a sample app module with a couple of UI tests, showing how to write those using this framework.

To run all the tests:

./gradlew :sample:pixel2DebugAndroidTest