Mockito junit test case for scheduler

Question

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 caaekindly let me know

Madhur-Madan · Accepted Answer

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.)
}

Madhur-Madan · Answer

Hi @nitrohazedev ,If my understanding is correct you are looking for an example that illustrates use of mokito to write Junit for schedularpackage 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 caseThanks,Madhur

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