Need help to write a unit test using Mockito and JUnit4

Question

Need help to write a unit test for the below code using Mockito and JUnit4,

public class MyFragmentPresenterImpl { 
      public Boolean isValid(String value         


        

Answer 1

Solution 1:

I would like to provide a Kotlin and a Java version.

Kotlin version:

import android.text.TextUtils

import org.junit.Before

import org.junit.runner.RunWith

import org.mockito.Matchers.any

import org.powermock.api.mockito.PowerMockito

import org.powermock.core.classloader.annotations.PrepareForTest

import org.powermock.modules.junit4.PowerMockRunner



@RunWith(PowerMockRunner::class)

@PrepareForTest(TextUtils::class)

class UserOwnedDataTest1 {



    @Before

    fun setup() {

        PowerMockito.mockStatic(TextUtils::class.java)

        PowerMockito.`when`(TextUtils.isEmpty(any(CharSequence::class.java))).thenAnswer { invocation ->

            val a = invocation.arguments[0] as? CharSequence

           a?.isEmpty() ?: true

        }

    }

}

Java version:

import android.text.TextUtils;



import org.junit.Before;

import org.junit.runner.RunWith;

import org.mockito.stubbing.Answer;

import org.powermock.api.mockito.PowerMockito;

import org.powermock.core.classloader.annotations.PrepareForTest;

import org.powermock.modules.junit4.PowerMockRunner;



import static org.mockito.Matchers.any;



@RunWith(PowerMockRunner.class)

@PrepareForTest(TextUtils.class)

public final class UserOwnedDataTest2 {



    @Before

    public void setup() {

        PowerMockito.mockStatic(TextUtils.class);

        PowerMockito.when(TextUtils.isEmpty(any(CharSequence.class))).thenAnswer((Answer) invocation -> {

            CharSequence a = (CharSequence) invocation.getArguments()[0];

            return !(a != null && a.length() > 0);

        });

    }

}

Do not forget to add the dependencies:

testCompile "org.powermock:powermock-module-junit4:1.6.2"

testCompile "org.powermock:powermock-module-junit4-rule:1.6.2"

testCompile "org.powermock:powermock-api-mockito:1.6.2"

testCompile "org.powermock:powermock-classloading-xstream:1.6.2"

I remember that we still need another dependency, but not clearly.

Anyway you could fix the missing dependency easily.

Solution 2:

Or you could add the same package and class name with TextUtils

package android.text;



public class TextUtils {

    public static boolean isEmpty( CharSequence str) {

        return str == null || str.length() == 0;

    }

}