Mockito - Verificación del comportamiento
Mockito puede asegurar si se llama a un método simulado con argumentos reequilibrados o no. Se hace usando elverify()método. Eche un vistazo al siguiente fragmento de código.
//test the add functionality
Assert.assertEquals(calcService.add(10.0, 20.0),30.0,0);
//verify call to calcService is made or not with same arguments.
verify(calcService).add(10.0, 20.0);
Ejemplo: verify () con los mismos argumentos
Step 1 − Create an interface called CalculatorService to provide mathematical functions
File: CalculatorService.java
public interface CalculatorService {
public double add(double input1, double input2);
public double subtract(double input1, double input2);
public double multiply(double input1, double input2);
public double divide(double input1, double input2);
}
Step 2 − Create a JAVA class to represent MathApplication
File: MathApplication.java
public class MathApplication {
private CalculatorService calcService;
public void setCalculatorService(CalculatorService calcService){
this.calcService = calcService;
}
public double add(double input1, double input2){
//return calcService.add(input1, input2);
return input1 + input2;
}
public double subtract(double input1, double input2){
return calcService.subtract(input1, input2);
}
public double multiply(double input1, double input2){
return calcService.multiply(input1, input2);
}
public double divide(double input1, double input2){
return calcService.divide(input1, input2);
}
}
Step 3 − Test the MathApplication class
Probemos la clase MathApplication, inyectando en ella una simulación de calculatorService. Mock será creado por Mockito.
File: MathApplicationTester.java
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;
// @RunWith attaches a runner with the test class to initialize the test data
@RunWith(MockitoJUnitRunner.class)
public class MathApplicationTester {
//@InjectMocks annotation is used to create and inject the mock object
@InjectMocks
MathApplication mathApplication = new MathApplication();
//@Mock annotation is used to create the mock object to be injected
@Mock
CalculatorService calcService;
@Test
public void testAdd(){
//add the behavior of calc service to add two numbers
when(calcService.add(10.0,20.0)).thenReturn(30.00);
//test the add functionality
Assert.assertEquals(calcService.add(10.0, 20.0),30.0,0);
//verify the behavior
verify(calcService).add(10.0, 20.0);
}
}
Step 4 − Execute test cases
Cree un archivo de clase java llamado TestRunner en C:\> Mockito_WORKSPACE para ejecutar casos de prueba.
File: TestRunner.java
import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;
public class TestRunner {
public static void main(String[] args) {
Result result = JUnitCore.runClasses(MathApplicationTester.class);
for (Failure failure : result.getFailures()) {
System.out.println(failure.toString());
}
System.out.println(result.wasSuccessful());
}
}
Step 5 − Verify the Result
Compila las clases usando javac compilador de la siguiente manera:
C:\Mockito_WORKSPACE>javac CalculatorService.java MathApplication.
java MathApplicationTester.java TestRunner.java
Ahora ejecute Test Runner para ver el resultado
C:\Mockito_WORKSPACE>java TestRunner
Verifique la salida.
true
Ejemplo: verify () con diferentes argumentos
Step 1 − Create an interface CalculatorService to provide mathematical functions
File: CalculatorService.java
public interface CalculatorService {
public double add(double input1, double input2);
public double subtract(double input1, double input2);
public double multiply(double input1, double input2);
public double divide(double input1, double input2);
}
Step 2 − Create a JAVA class to represent MathApplication
File: MathApplication.java
public class MathApplication {
private CalculatorService calcService;
public void setCalculatorService(CalculatorService calcService){
this.calcService = calcService;
}
public double add(double input1, double input2){
//return calcService.add(input1, input2);
return input1 + input2;
}
public double subtract(double input1, double input2){
return calcService.subtract(input1, input2);
}
public double multiply(double input1, double input2){
return calcService.multiply(input1, input2);
}
public double divide(double input1, double input2){
return calcService.divide(input1, input2);
}
}
Step 3 − Test the MathApplication class
Probemos la clase MathApplication, inyectando en ella una simulación de calculatorService. Mock será creado por Mockito.
File: MathApplicationTester.java
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;
// @RunWith attaches a runner with the test class to initialize the test data
@RunWith(MockitoJUnitRunner.class)
public class MathApplicationTester {
//@InjectMocks annotation is used to create and inject the mock object
@InjectMocks
MathApplication mathApplication = new MathApplication();
//@Mock annotation is used to create the mock object to be injected
@Mock
CalculatorService calcService;
@Test
public void testAdd(){
//add the behavior of calc service to add two numbers
when(calcService.add(10.0,20.0)).thenReturn(30.00);
//test the add functionality
Assert.assertEquals(calcService.add(10.0, 20.0),30.0,0);
//verify the behavior
verify(calcService).add(20.0, 30.0);
}
}
Step 4 − Execute test cases
Cree un archivo de clase java llamado TestRunner en C:\> Mockito_WORKSPACE para ejecutar casos de prueba.
File: TestRunner.java
import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;
public class TestRunner {
public static void main(String[] args) {
Result result = JUnitCore.runClasses(MathApplicationTester.class);
for (Failure failure : result.getFailures()) {
System.out.println(failure.toString());
}
System.out.println(result.wasSuccessful());
}
}
Step 5 − Verify the Result
Compila las clases usando javac compilador de la siguiente manera:
C:\Mockito_WORKSPACE>javac CalculatorService.java MathApplication.
java MathApplicationTester.java TestRunner.java
Ahora ejecute Test Runner para ver el resultado:
C:\Mockito_WORKSPACE>java TestRunner
Verifique la salida.
testAdd(MathApplicationTester):
Argument(s) are different! Wanted:
calcService.add(20.0, 30.0);
-> at MathApplicationTester.testAdd(MathApplicationTester.java:32)
Actual invocation has different arguments:
calcService.add(10.0, 20.0);
-> at MathApplication.add(MathApplication.java:10)
false