Tworzenie testów instrumentalnych

import android.os.Parcel
import android.text.TextUtils.writeToParcel
import androidx.test.filters.SmallTest
import androidx.test.runner.AndroidJUnit4
import com.google.common.truth.Truth.assertThat
import org.junit.Before
import org.junit.Test
import org.junit.runner.RunWith

const val TEST_STRING = "This is a string"
const val TEST_LONG = 12345678L

// @RunWith is required only if you use a mix of JUnit3 and JUnit4.
@RunWith(AndroidJUnit4::class)
@SmallTest
class LogHistoryAndroidUnitTest {
    private lateinit var logHistory: LogHistory

    @Before
    fun createLogHistory() {
        logHistory = LogHistory()
    }

    @Test
    fun logHistory_ParcelableWriteRead() {
        val parcel = Parcel.obtain()
        logHistory.apply {
            // Set up the Parcelable object to send and receive.
            addEntry(TEST_STRING, TEST_LONG)

            // Write the data.
            writeToParcel(parcel, describeContents())
        }

        // After you're done with writing, you need to reset the parcel for reading.
        parcel.setDataPosition(0)

        // Read the data.
        val createdFromParcel: LogHistory = LogHistory.CREATOR.createFromParcel(parcel)
        createdFromParcel.getData().also { createdFromParcelData: List<Pair<String, Long>> ->

            // Verify that the received data is correct.
            assertThat(createdFromParcelData.size).isEqualTo(1)
            assertThat(createdFromParcelData[0].first).isEqualTo(TEST_STRING)
            assertThat(createdFromParcelData[0].second).isEqualTo(TEST_LONG)
        }
    }
}

import android.os.Parcel;
import android.util.Pair;
import androidx.test.runner.AndroidJUnit4;
import com.google.common.truth.Truth.assertThat;
import java.util.List;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;

// @RunWith is required only if you use a mix of JUnit3 and JUnit4.
@RunWith(AndroidJUnit4.class)
public class LogHistoryAndroidUnitTest {

    public static final String TEST_STRING = "This is a string";
    public static final long TEST_LONG = 12345678L;
    private LogHistory mLogHistory;

    @Before
    public void createLogHistory() {
        mLogHistory = new LogHistory();
    }

    @Test
    public void logHistory_ParcelableWriteRead() {
        // Set up the Parcelable object to send and receive.
        mLogHistory.addEntry(TEST_STRING, TEST_LONG);

        // Write the data.
        Parcel parcel = Parcel.obtain();
        mLogHistory.writeToParcel(parcel, mLogHistory.describeContents());

        // After you're done with writing, you need to reset the parcel for reading.
        parcel.setDataPosition(0);

        // Read the data.
        LogHistory createdFromParcel = LogHistory.CREATOR.createFromParcel(parcel);
        List<Pair<String, Long>> createdFromParcelData
                = createdFromParcel.getData();

        // Verify that the received data is correct.
        assertThat(createdFromParcelData.size()).isEqualTo(1);
        assertThat(createdFromParcelData.get(0).first).isEqualTo(TEST_STRING);
        assertThat(createdFromParcelData.get(0).second).isEqaulTo(TEST_LONG);
    }
}