instrumentation test

QuoteManagerTest.kt

import android.content.Context
import androidx.test.core.app.ApplicationProvider
import com.google.gson.JsonSyntaxException
import org.junit.Assert.*

import org.junit.After
import org.junit.Before
import org.junit.Test
import java.io.FileNotFoundException


class QuoteManagerTest {

    @Before
    fun setUp() {
    }

    @After
    fun tearDown() {
    }

    @Test(expected = FileNotFoundException::class)
    fun populateQuoteFromAssets_InvalidFileName_expected_Exception() {
        val quoteManager = QuoteManager()
        val context = ApplicationProvider.getApplicationContext<Context>()
        quoteManager.populateQuoteFromAssets(context,"")
    }

    @Test(expected = JsonSyntaxException::class)
    fun testPopulateQuoteFromAssets_InvalidJSON_expected_Exception(){
        val quoteManager = QuoteManager()
        val context = ApplicationProvider.getApplicationContext<Context>()
        quoteManager.populateQuoteFromAssets(context,"malformed.json")
    }

    @Test
    fun testPopulateQuoteFromAssets_ValidJSON_expected_Count(){
        val quoteManager = QuoteManager()
        val context = ApplicationProvider.getApplicationContext<Context>()
        quoteManager.populateQuoteFromAssets(context,"quotes.json")
        assertEquals(4,quoteManager.quoteList.size)
    }

    @Test
    fun testPreviousQuote_expected_CorrectQuote(){
        //Arrange
        val quoteManager = QuoteManager()
        quoteManager.populateQuotes(
            arrayOf(
               Quote( "This is first quote","1"),
               Quote( "This is second quote","2"),
               Quote( "This is third quote","3")
            ))

        //Act
        val quote = quoteManager.getPreviousQuote()
        //Assert
        assertEquals("1",quote.author)
    }

    @Test
    fun testNextQuote_expected_CorrectQuote(){
        //Arrange
        val quoteManager = QuoteManager()
        quoteManager.populateQuotes(
            arrayOf(
                Quote( "This is first quote","1"),
                Quote( "This is second quote","2"),
                Quote( "This is third quote","3")
            ))

        //Act
        val quote = quoteManager.getNextQuote()
        //Assert
        assertEquals("2",quote.author)
    }
}