Getting Uncommitted work pending Error in my Test class

Hi Akash,
Sometimes a developer needs to create a record and then update it with information provided by a Web Service. However,  you can't do a web service callout after a DML operation in the same transaction. You should move your batch execution to the inside of the Test.startTest block.
@isTest
private class MyFunTest {
@isTest
static void runTest() {
Account a = new Account(name='foo');
insert a;

Test.startTest();
Test.setMock(HttpCalloutMock.class, new MockHttpResponseGenerator());
MyCalloutClass.getInfoFromExternalService();
Test.stopTest();
}
}

You may try the following for System.CalloutException: You have uncommitted work pending. Please commit or rollback before calling out

@isTest
private class MyFunTest {
@isTest
static void runTest() {
Account a = new Account(name=’foo’);
insert a;

Test.startTest();
Test.setMock(HttpCalloutMock.class, new MockHttpResponseGenerator());
MyCalloutClass.getInfoFromExternalService();
Test.stopTest();
}
}