activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".day1.MainActivity">

    <com.google.android.material.textview.MaterialTextView
        android:id="@+id/label_txt"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/name_txt"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toTopOf="@id/name_edt"
        android:text="Hello..."
        android:textSize="32sp"
        android:gravity="end"
        android:textColor="@color/black"
        android:textStyle="bold"
        android:visibility="gone"
        android:layout_marginEnd="8dp"
        />
    <com.google.android.material.textview.MaterialTextView
        android:id="@+id/name_txt"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        android:textSize="32sp"
        android:textColor="@color/black"
        app:layout_constraintStart_toEndOf="@id/label_txt"
        app:layout_constraintEnd_toEndOf="parent"
        android:textStyle="bold"
        app:layout_constraintBottom_toTopOf="@id/name_edt"/>

    <com.google.android.material.textfield.TextInputEditText
        android:id="@+id/name_edt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginHorizontal="32dp"
        app:layout_constraintBottom_toBottomOf="parent"/>

    <com.google.android.material.button.MaterialButton
        android:id="@+id/same_act"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="Same Screen"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/nxt_act"
        app:layout_constraintTop_toBottomOf="@id/name_edt"/>
    <com.google.android.material.button.MaterialButton
        android:id="@+id/nxt_act"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toEndOf="@id/same_act"
        app:layout_constraintEnd_toEndOf="parent"
        android:text="Next Screen"
        android:layout_marginTop="32dp"
        app:layout_constraintTop_toBottomOf="@id/name_edt"/>

</androidx.constraintlayout.widget.ConstraintLayout>

activity_show.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".day1.ShowAct">


    <com.google.android.material.textview.MaterialTextView
        android:id="@+id/label_txt"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/show_name_txt"
        app:layout_constraintTop_toTopOf="@id/show_name_txt"
        android:text="Hello..."
        android:textSize="32sp"
        android:gravity="end"
        android:textColor="@color/black"
        android:textStyle="bold"
        android:layout_marginEnd="8dp"
        app:layout_constraintBottom_toBottomOf="@id/show_name_txt"/>

    <com.google.android.material.textview.MaterialTextView
        android:id="@+id/show_name_txt"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toEndOf="@id/label_txt"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:text="Mugundh"
        android:textSize="32sp"
        android:textColor="@color/black"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        />

</androidx.constraintlayout.widget.ConstraintLayout>

day1.txt

In this we have 2 activity. basic testing is done with espresso and performed basic actions

MainActivity.kt

package com.app.unittesting.day1

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import androidx.databinding.DataBindingUtil
import com.app.unittesting.R
import com.app.unittesting.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)
        binding.sameAct.setOnClickListener {
            binding.labelTxt.visibility= View.VISIBLE
            binding.nameTxt.text = binding.nameEdt.text.toString()
        }
        binding.nxtAct.setOnClickListener {
            val intent= Intent(this@MainActivity,ShowAct::class.java)
            intent.putExtra("name",binding.nameEdt.text.toString())
            startActivity(intent)
        }
    }
}

ShowAct.kt

package com.app.unittesting.day1

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import com.app.unittesting.R
import com.app.unittesting.databinding.ActivityMainBinding
import com.app.unittesting.databinding.ActivityShowBinding

class ShowAct : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding = ActivityShowBinding.inflate(layoutInflater)
        setContentView(binding.root)
        if (intent.hasExtra("name")) {
            binding.showNameTxt.text=intent.getStringExtra("name")
        }
    }
}