Sample Class:
public class LeadCreation {
public Lead objLead;
public String lastName;
public LeadCreation() {
}
public PageReference newLead() {
objLead = new Lead(Company = 'Test', LastName = lastName, Status = 'Open - Not Contacted');
try {
insert objLead;
PageReference pg = new PageReference('/' + objLead.Id);
pg.setRedirect(true);
return pg;
} catch(DMLException e) {
return null;
}
}
}
Test Class:
@isTest
private class LeadCreationTest {
@isTest static void leadTest() {
LeadCreation obj = new LeadCreation();
try {
obj.newLead();
} catch(DMLException e) {
system.assert(e.getMessage().contains('Last Name'));
}
obj.lastName = 'Testing';
obj.newLead();
}
}
Note:
This code is written in a way to just cover catch block.