Bootstrap a CoreData test class

Test.h

#import <SenTestingKit/SenTestingKit.h>
#import <CoreData/CoreData.h>

@interface Test : SenTestCase {
  NSManagedObjectModel *model;
  NSPersistentStoreCoordinator *coordinator;
  NSManagedObjectContext *context;
}

- (NSString *)applicationSupportDirectory;
@end

Test.m

#import "Test.h"

@implementation Test
- (void)setUp {
  model = [[NSManagedObjectModel mergedModelFromBundles:
            [NSArray arrayWithObject:[NSBundle bundleWithIdentifier:@"com.yourcompany.test"]]] retain];
  coordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:model];
  context = [[NSManagedObjectContext alloc] init];
  [context setPersistentStoreCoordinator:coordinator];
  
  NSFileManager *fileManager = [NSFileManager defaultManager];
  NSString *applicationSupportDirectory = [self applicationSupportDirectory];
  NSError *error = nil;
  
  if ( ![fileManager fileExistsAtPath:applicationSupportDirectory isDirectory:NULL] ) {
		if (![fileManager createDirectoryAtPath:applicationSupportDirectory withIntermediateDirectories:NO attributes:nil error:&error]) {
      NSAssert(NO, ([NSString stringWithFormat:@"Failed to create App Support directory %@ : %@", applicationSupportDirectory,error]));
      NSLog(@"Error creating application support directory at %@ : %@",applicationSupportDirectory,error);
		}
  }
  
  NSURL *storeUrl = [NSURL fileURLWithPath: [applicationSupportDirectory stringByAppendingPathComponent: @"test"]];
  [fileManager removeItemAtPath:storeUrl.path error:&error];
  if (![coordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:nil error:&error]) {
    NSLog(@"Error creating store: %@", error);
  }
}

- (NSString *)applicationSupportDirectory {
  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES);
  NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : NSTemporaryDirectory();
  return [basePath stringByAppendingPathComponent:@"test"];
}
@end