Make used NSBundle overridable

Classes/CoreDataManager.h

@@ -31,6 +31,7 @@
 
 @property (copy, nonatomic) NSString *databaseName;
 @property (copy, nonatomic) NSString *modelName;
+@property (strong, nonatomic) NSBundle *bundle;
 
 + (id)instance DEPRECATED_ATTRIBUTE;
 + (instancetype)sharedManager;

Classes/CoreDataManager.m

@@ -47,7 +47,7 @@ + (instancetype)sharedManager {
 #pragma mark - Private
 
 - (NSString *)appName {
-    return [[NSBundle bundleForClass:[self class]] infoDictionary][@"CFBundleName"];
+    return [self.bundle infoDictionary][@"CFBundleName"];
 }
 
 - (NSString *)databaseName {
@@ -80,7 +80,7 @@ - (NSManagedObjectContext *)managedObjectContext {
 - (NSManagedObjectModel *)managedObjectModel {
     if (_managedObjectModel) return _managedObjectModel;
 
-    NSURL *modelURL = [[NSBundle bundleForClass:[self class]] URLForResource:[self modelName] withExtension:@"momd"];
+    NSURL *modelURL = [self.bundle URLForResource:[self modelName] withExtension:@"momd"];
     _managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
     return _managedObjectModel;
 }
@@ -111,6 +111,13 @@ - (BOOL)saveContext {
     return YES;
 }
 
+- (NSBundle *)bundle {
+    if (_bundle) return _bundle;
+
+    _bundle = [NSBundle bundleForClass:self.class];
+
+    return _bundle;
+}
 
 #pragma mark - SQLite file directory