For this lab, you'll create a Worker and test it. First create a new project and add the
work-runtime and work-testing dependencies, as well as kluentAndroid. Since you'll be writing
tests in Kotlin, make sure to apply the kotlin-android plugin at the top of your application level
build.gradle.
apply plugin: 'kotlin-android'
dependencies {
def work_version = "2.0.0"
implementation "androidx.work:work-runtime:$work_version"
androidTestImplementation "androidx.work:work-testing:$work_version"
androidTestImplementation "org.amshove.kluent:kluent-android:1.49"
}In your main source directory, create a class FibonacciWorker that extends from the Worker
class.
It should have the following methods:
/**
* Returns a Data object with a key of KEY_NTH_FIB and a value of n
*/
public static Data makeInputData(int n);
/**
* Computes the nth Fibonacci number
*/
private int nthFib(int n);
/**
* Returns a Result.success(Data) where the outputData contains the
* result of computing the nth Fibonacci number. Use the key KEY_NTH_FIB
*
* Returns Result.failure() if n < 0
*/
@NonNull @Override public Result doWork();Once you have created FibonacciWorker, write an Android test for it in Kotlin. In your setup
method, make sure to configure WorkManager for testing.
Write the following tests:
/**
* Pass an input of 3 and verify that the Worker succeeded and the output
* value is 2. When building the WorkRequest, make sure that this work
* only happens when the battery is not low and the device is idle. Let's
* pretend that computing the nth Fibonacci number is very
* computationally expensive.
*/
@Test
fun whenPositiveNumberGiven_WorkerComputesResult() {}
/**
* Pass an input of -1 and verify that the Worker returns a failed
* result. The constraints should be the same as the previous test,
* because computing the nth Fibonacci number is computationally
* expensive.
*/
@Test
fun whenNegativeNumberGiven_WorkerReturnsFailure() {}