Sample iOS Unit Tests: Confirming Model object instantation of a NSManagedObject subclass

Sample iOS Unit Tests: Confirming Model object instantation of a NSManagedObject subclass

#import <UIKit/UIKit.h>
#import <XCTest/XCTest.h>
#import "SightingReport.h"
#import "SightingReport+CoreData.h"
#import "AppDelegate.h"

@interface SightingReportTest : XCTestCase

//for accessing CoreData NSManagedObjectContext in assertions
@property (nonatomic, strong) AppDelegate *appDelegate;
@property (nonatomic, strong) NSManagedObjectContext *managedObjectContext;

//system under test (i.e. model class)
@property (nonatomic, strong) SightingReport *modelUnderTest;

@end


@implementation SightingReportTest

- (void)setUp {
    
    [super setUp];
    
    //for accessing CoreData NSManagedObjectContext
    self.appDelegate = [[UIApplication sharedApplication] delegate];
    self.managedObjectContext = [self.appDelegate managedObjectContext];
    
    //instantiate system under test
    self.modelUnderTest = [SightingReport createNewSightingReportWithCommonName:@"Mediterranean white snail" inManagedObjectContext:self.managedObjectContext];
}

- (void)tearDown {
    
    //delete test data
    [SightingReport deleteSightingReportForUUID:self.modelUnderTest.uniqueId inManagedObjectContext:self.managedObjectContext];
    
    self.modelUnderTest = nil;
    
    self.managedObjectContext = nil;
    
    self.appDelegate = nil;
    
    [super tearDown];
}

- (void)testModelInstantiatesNewSightingReport {
    
    XCTAssertNotNil(self.modelUnderTest, @"Model under test fails to instantiate a new instance");
}

//simply assert against actual vs. expected values (ignore the domain specific attributes)

- (void)testModelSetsCommonNameCorrectlyForNewSightingReport {
    
    NSString *actualCommonName = self.modelUnderTest.commonName;
    
    NSString *expectedCommonName = @"Mediterranean white snail";
    
    XCTAssertEqualObjects(actualCommonName, expectedCommonName, @"Model under test fails to create new SightingReport with correct common name.");
}

- (void)testModelSetsScientificNameCorrectlyForNewSightingReport {
    
    NSString *actualScientificName = self.modelUnderTest.scientificName;
    
    NSString *expectedScientificName = @"Cernuella virgata";
    
    XCTAssertEqualObjects(actualScientificName, expectedScientificName, @"Model under test fails to create new SightingReport with correct scientific name.");
}

- (void)testModelSetsGroupCorrectlyForNewSightingReport {
    
    NSString *actualGroup = self.modelUnderTest.group;
    
    NSString *expectedGroup = @"Aquatic Animals";
    
    XCTAssertEqualObjects(actualGroup, expectedGroup, @"Model under test fails to create new SightingReport with correct group name.");
}

- (void)testModelSetsKingdomCorrectlyForNewSightingReport {
    
    NSString *actualKingdom = self.modelUnderTest.kingdom;
    
    NSString *expectedKingdom = @"Animal";
    
    XCTAssertEqualObjects(actualKingdom, expectedKingdom, @"Model under test fails to create new SightingReport with correct kingdom.");
}

- (void)testModelSetsUUIDForNewSightingReport {
    
    XCTAssertNotNil(self.modelUnderTest.uniqueId, @"Model under test fails to create a universaly unique identifier for new Sighting Report");
    
    XCTAssert([self.modelUnderTest.uniqueId length] > 0, @"Model under test fails to create a universaly unique identifier for new Sighting Report");
}

@end