sonikro/kotlin-mockito-tests

Sample repository for experimenting with Kotlin and Mockito tests

kotlin-mockito-tests

Introduction

This repository was created to experiment on what would be a good structure for writting unit tests with Kotlin + Mockito

Code Samples

The idea was to try to replicate as much as possible, the structure of unit tests with JEST (NodeJS), and using the pattern of MakeSuts (System Under Test).

Example

private data class SUT(
    val sut: LoadRecordFromCDC,
    val recordLoaderFactory: RecordLoaderFactory,
    val dummyLoader: RecordLoader,
    val metadata: RecordMetadata,
    val record: Record
)

internal class LoadRecordFromCDCTest {

    private fun makeSut(): SUT {
        val recordLoaderFactory = mock<RecordLoaderFactory>()
        val metadata = RecordMetadata(
            schemaName = "OT",
            tableName = "CUSTOMER",
            operation = "insert"
        )
        val record = Record(
            metadata,
            data = linkedMapOf(
                "ID" to "1",
                "NAME" to "Joselito da Silva"
            )
        )
        return SUT(
            sut = LoadRecordFromCDC(recordLoaderFactory),
            recordLoaderFactory,
            dummyLoader = mock(),
            metadata,
            record
        )
    }

    @Test
    fun `it invokes the RecordLoaderFactory and passes the record to the loader`() {
        val (sut, recordLoaderFactory, dummyLoader, metadata, record) = makeSut()
        //Given
        whenever(
            recordLoaderFactory.factory(schemaName = any(), tableName = any())
        ).thenReturn(dummyLoader)
        //When
        sut.invoke(record)
        //Then
        verify(recordLoaderFactory).factory(
            schemaName = metadata.schemaName,
            tableName = metadata.tableName
        )
        verify(dummyLoader).loadRecord(record)
    }

}

Running the tests

./gradlew test