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livedata-testing

(★ 406)

TestObserver to easily test LiveData and make assertions on them.

파일 탐색기

최종 버전 다운로드 (.zip)

- - build.yml
  - release.yml
- dependabot.yml
- - gradle-wrapper.jar
  - gradle-wrapper.properties
- signing-key.gpg
- livedata-testing.png
- .gitignore
- build.gradle
- .gitignore
- build.gradle
.editorconfig
.gitignore
build.gradle
gradle.properties
gradlew
gradlew.bat
LICENSE
README.md
settings.gradle

# 설치 가이드

1. 코드 내려받기

git clone https://github.com/jraska/livedata-testing

깃허브에서 프로젝트 코드 전체를 내 컴퓨터로 내려받습니다.

cd livedata-testing

방금 내려받은 프로젝트 폴더 안으로 이동합니다.

2. Gradle (Java/Kotlin)

보통 추천

사전 준비물

Git GitHub에서 프로젝트 코드를 내려받으려면 필요합니다.
JDK (Java) Java/Kotlin 프로젝트를 빌드/실행하려면 필요합니다.
Gradle 레포에 포함된 gradlew(Gradle Wrapper)를 쓰면 Gradle을 따로 설치할 필요가 없습니다.

./gradlew build

Gradle로 빌드를 진행합니다.

✅ BUILD SUCCESSFUL 메시지가 뜨면 성공입니다. build/ 폴더에 결과물이 생성됩니다.

// repository documentation

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# LiveData Testing
TestObserver to easily test LiveData and make assertions on them.

[![Maven Central](https://img.shields.io/maven-central/v/com.jraska.livedata/testing-ktx.svg?label=Maven%20Central)](https://search.maven.org/search?q=g:%22com.jraska.livedata%22%20AND%20a:%22testing-ktx%22)
[![License](https://img.shields.io/badge/license-Apache%202.0-green.svg) ](https://github.com/jraska/livedata-testing/blob/master/LICENSE)
[![Android Arsenal](https://img.shields.io/badge/Android%20Arsenal-LiveData%20Testing-green.svg)]( https://android-arsenal.com/details/1/7255 )

Read [Medium Article](https://medium.com/@josef.raska/effective-livedata-and-viewmodel-testing-17f25069fcd4) for more info.

[![Explanatory Diagram](https://raw.githubusercontent.com/jraska/livedata-testing/master/img/livedata-testing.png)](https://medium.com/@josef.raska/effective-livedata-and-viewmodel-testing-17f25069fcd4)

## Usage

Having `LiveData<Integer>` of counter from 0 to 4:

Kotlin - see [ExampleTest.kt](https://github.com/jraska/livedata-testing/blob/master/testing-ktx/src/test/java/com/jraska/livedata/example/ExampleTest.kt)
```java
liveData.test()
  .awaitValue()
  .assertHasValue()
  .assertValue { it > 3 }
  .assertValue(4)
  .assertHistorySize(5)
  .assertNever { it > 4 }

// Assertion on structures with a lot of nesting
viewLiveData.map { it.items[0].header.title }
  .assertValue("Expected title")
```

Java - see [ExampleTest.java](https://github.com/jraska/livedata-testing/blob/master/testing-ktx/src/test/java/com/jraska/livedata/example/ExampleJavaTest.java)
```java
TestObserver.test(liveData)
  .awaitValue()
  .assertHasValue()
  .assertValue(value -> value > 3)
  .assertValue(4)
  .assertHistorySize(5)
  .assertNever(value -> value > 4);
```

Don't forget to use `InstantTaskExecutorRule` from `androidx.arch.core:core-testing` to make your LiveData test run properly.

## Download

##### Kotlin users:
```groovy
testImplementation 'com.jraska.livedata:testing-ktx:1.3.0'
```

##### Java users:
```groovy
testImplementation 'com.jraska.livedata:testing:1.3.0'
```

## [Philosophy](https://medium.com/@josef.raska/effective-livedata-and-viewmodel-testing-17f25069fcd4)

This library is created in a belief that to effective and valuable test should be fast to write and model real code usage.
As by Architecture components spec Activity should communicate with its ViewModel only through observing LiveData.
TestObserver in this case simulates the Activity and by testing LiveData, we could test our whole logic except the View where the responsibility belongs to Activity.
Key ideas:
* Test pretends to be an Activity
* No Android framework mocking or Robolectric - just standard fast JUnit tests
* Fluent API inspired by RxJava TestObserver
* Easy to write fast executing tests - possibly TDD