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Mockito junit test case for scheduler

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Level 10

Hi,

I have an example that I am building out and looking for assistance on the functions to add remove schedulers etc 

i find options within the forum for the most part but not for this caae

kindly let me know  

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1 Accepted Solution

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Correct answer by
Community Advisor

You mentioned that there are missing methods related to invoking, modifying, deactivating, removing, or adding a scheduler. To provide guidance on those methods, I’ll need more context or details about what you’re trying to achieve. Could you please clarify which methods you need assistance with?

When using Mockito to verify method invocations, you can handle conditional paths (such as if (node != null)) by setting up different behaviors for the mock object based on the condition. Here’s how you can handle both paths. The conditional behavior is handled by the different responses from externalAPIClient.fetchData() based on whether node is null or not.

 

package com.myproject.core.schedulers;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Mockito.*;

class MySchedulerTest {

    @Mock
    private ExternalAPIClient externalAPIClient; // Assume this is your external service

    private MyScheduler myScheduler;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.initMocks(this);
        myScheduler = new MyScheduler(externalAPIClient); // Inject the mock dependency
    }

    
    void testProcessData_Success() {
        // Arrange: Set up any necessary data or context
        when(externalAPIClient.fetchData()).thenReturn("Mocked data from API");

        // Act: Call the scheduler function
        String result = myScheduler.processData();

        // Assert: Verify the expected behavior
        assertEquals("Data processed successfully", result);

        // Verify that the externalAPIClient.fetchData() was called
        verify(externalAPIClient, times(1)).fetchData();
    }

    
    void testProcessData_APIFailure() {
        // Arrange: Simulate API failure
        when(externalAPIClient.fetchData()).thenThrow(new RuntimeException("API error"));

        // Act: Call the scheduler function
        String result = myScheduler.processData();

        // Assert: Verify the expected behavior
        assertEquals("Error processing data", result);

        // Verify that the externalAPIClient.fetchData() was called
        verify(externalAPIClient, times(1)).fetchData();
    }

    
    void testModifyScheduler() {
        // Arrange: Set up necessary data or context for modifying the scheduler
        // ...

        // Act: Call the modifyScheduler method
        boolean modified = myScheduler.modifyScheduler(/* parameters */);

        // Assert: Verify the modification result
        assertEquals(true, modified);
        // Additional assertions specific to your use case
    }

    
    void testDeactivateScheduler() {
        // Arrange: Set up necessary data or context for deactivating the scheduler
        // ...

        // Act: Call the deactivateScheduler method
        boolean deactivated = myScheduler.deactivateScheduler(/* parameters */);

        // Assert: Verify the deactivation result
        assertEquals(true, deactivated);
        // Additional assertions specific to your use case
    }

    // Similar test methods for other scheduler-related actions (removeScheduler, addScheduler, etc.)
}

 

 

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11 Replies

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Community Advisor

Hi @NitroHazeDev ,
If my understanding is correct you are looking for an example that illustrates use of mokito to write Junit for schedular

package com.myproject.core.schedulers;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Mockito.*;

class MySchedulerTest {

    @Mock
    private ExternalAPIClient externalAPIClient; // Assume this is your external service

    private MyScheduler myScheduler;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.initMocks(this);
        myScheduler = new MyScheduler(externalAPIClient); // Inject the mock dependency
    }

    @Test
    void testProcessData_Success() {
        // Arrange: Set up any necessary data or context
        when(externalAPIClient.fetchData()).thenReturn("Mocked data from API");

        // Act: Call the scheduler function
        String result = myScheduler.processData();

        // Assert: Verify the expected behavior
        assertEquals("Data processed successfully", result);

        // Verify that the externalAPIClient.fetchData() was called
        verify(externalAPIClient, times(1)).fetchData();
    }

    @Test
    void testProcessData_APIFailure() {
        // Arrange: Simulate API failure
        when(externalAPIClient.fetchData()).thenThrow(new RuntimeException("API error"));

        // Act: Call the scheduler function
        String result = myScheduler.processData();

        // Assert: Verify the expected behavior
        assertEquals("Error processing data", result);

        // Verify that the externalAPIClient.fetchData() was called
        verify(externalAPIClient, times(1)).fetchData();
    }
}

We’ve created two test methods: testProcessData_Success() and testProcessData_APIFailure().
In testProcessData_Success(), we mock the external API client to return data, call myScheduler.processData(), and verify the expected result.
In testProcessData_APIFailure(), we simulate an API error and verify that the function handles it correctly.

Replace ExternalAPIClient with your real dependency, and adjust the behavior and assertions based on your specific use case

Thanks,
Madhur

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Level 10

Thanks @Madhur-Madan  the only missing piece is the methods that get invoked modified , deactivate , remove scheduler add scheduler etc .

 

Also how do we get both paths checked if condition is if(node!=null) in mockito? It says one path is missing 

Avatar

Correct answer by
Community Advisor

You mentioned that there are missing methods related to invoking, modifying, deactivating, removing, or adding a scheduler. To provide guidance on those methods, I’ll need more context or details about what you’re trying to achieve. Could you please clarify which methods you need assistance with?

When using Mockito to verify method invocations, you can handle conditional paths (such as if (node != null)) by setting up different behaviors for the mock object based on the condition. Here’s how you can handle both paths. The conditional behavior is handled by the different responses from externalAPIClient.fetchData() based on whether node is null or not.

 

package com.myproject.core.schedulers;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Mockito.*;

class MySchedulerTest {

    @Mock
    private ExternalAPIClient externalAPIClient; // Assume this is your external service

    private MyScheduler myScheduler;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.initMocks(this);
        myScheduler = new MyScheduler(externalAPIClient); // Inject the mock dependency
    }

    
    void testProcessData_Success() {
        // Arrange: Set up any necessary data or context
        when(externalAPIClient.fetchData()).thenReturn("Mocked data from API");

        // Act: Call the scheduler function
        String result = myScheduler.processData();

        // Assert: Verify the expected behavior
        assertEquals("Data processed successfully", result);

        // Verify that the externalAPIClient.fetchData() was called
        verify(externalAPIClient, times(1)).fetchData();
    }

    
    void testProcessData_APIFailure() {
        // Arrange: Simulate API failure
        when(externalAPIClient.fetchData()).thenThrow(new RuntimeException("API error"));

        // Act: Call the scheduler function
        String result = myScheduler.processData();

        // Assert: Verify the expected behavior
        assertEquals("Error processing data", result);

        // Verify that the externalAPIClient.fetchData() was called
        verify(externalAPIClient, times(1)).fetchData();
    }

    
    void testModifyScheduler() {
        // Arrange: Set up necessary data or context for modifying the scheduler
        // ...

        // Act: Call the modifyScheduler method
        boolean modified = myScheduler.modifyScheduler(/* parameters */);

        // Assert: Verify the modification result
        assertEquals(true, modified);
        // Additional assertions specific to your use case
    }

    
    void testDeactivateScheduler() {
        // Arrange: Set up necessary data or context for deactivating the scheduler
        // ...

        // Act: Call the deactivateScheduler method
        boolean deactivated = myScheduler.deactivateScheduler(/* parameters */);

        // Assert: Verify the deactivation result
        assertEquals(true, deactivated);
        // Additional assertions specific to your use case
    }

    // Similar test methods for other scheduler-related actions (removeScheduler, addScheduler, etc.)
}

 

 

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Level 10

Thanks Madan, appreciate it

and what is the corresponding Java class that we have for this ? I can test it real quick and update 

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Level 10

Also Madan , the if(node!=null) just does not work well with when statement if we have when(node)thenreturn null 

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Community Advisor
package com.myproject.core.schedulers;

public class MyScheduler {

private ExternalAPIClient externalAPIClient;

public MyScheduler(ExternalAPIClient externalAPIClient) {
this.externalAPIClient = externalAPIClient;
}

public String processData() {
try {
String data = externalAPIClient.fetchData();
// Process data here
return "Data processed successfully";
} catch (RuntimeException e) {
// Handle API failure
return "Error processing data";
}
}

public boolean modifyScheduler(/* parameters */) {
// Logic to modify scheduler
return true; // Assuming modification is successful
}

public boolean deactivateScheduler(/* parameters */) {
// Logic to deactivate scheduler
return true; // Assuming deactivation is successful
}

// Additional methods for other scheduler-related actions (addScheduler, removeScheduler, etc.)
}

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Level 10

Thanks Madhur, I have a schedule options and it bombs there with options as null , will try to update here 

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Level 10

@Madhur-Madan  If schedule options is used eg 

scheduleoptions opts= scheduler.expr(expn)

opts.name(“name”)

opts.canrunconcurrently(true)

 

this is inside activate method and when I set opts in test the line below throws NPE opts is null but prev line runs 

opts.name(“name”)

 

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Administrator

@NitroHazeDev Did you find the suggestions helpful? Please let us know if more information is required. Otherwise, please mark the answer as correct for posterity. If you have found out solution yourself, please share it with the community.



Kautuk Sahni

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Level 10

Marked it @kautuk_sahni if I get back to this issue and get a soln with scheduleopts ll update