text: // Copyright (c) 2015 RAMBLER&Co
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  
  #import <XCTest/XCTest.h>
  #import <OCMock/OCMock.h>
  #import <MagicalRecord/MagicalRecord.h>
  
  #import "XCTestCase+RCFHelpers.h"
  
  #import "FetchedResultsControllerChangeProvider.h"
  #import "ChangeProviderFetchRequestFactory.h"
  #import "ObjectTransformer.h"
  #import "EventModelObject.h"
  #import "ChangeProviderDelegate.h"
  
  @interface FetchedResultsControllerChangeProviderTests : XCTestCase
  
  @property (nonatomic, strong) FetchedResultsControllerChangeProvider *provider;
  @property (nonatomic, strong) id mockRequestFactory;
  @property (nonatomic, strong) id mockObjectTransformer;
  @property (nonatomic, strong) id mockDelegate;
  
  @end
  
  @implementation FetchedResultsControllerChangeProviderTests
  
  - (void)setUp {
      [super setUp];
      
      [self setupCoreDataStackForTests];
      
      self.mockRequestFactory = OCMProtocolMock(@protocol(ChangeProviderFetchRequestFactory));
      self.mockObjectTransformer = OCMProtocolMock(@protocol(ObjectTransformer));
      self.mockDelegate = OCMProtocolMock(@protocol(ChangeProviderDelegate));
      
      self.provider = [FetchedResultsControllerChangeProvider changeProviderWithFetchRequestFactory:self.mockRequestFactory
                                                                                  objectTransformer:self.mockObjectTransformer];
      self.provider.delegate = self.mockDelegate;
  }
  
  - (void)tearDown {
      self.provider = nil;
      
      self.mockRequestFactory = nil;
      self.mockObjectTransformer = nil;
      self.mockDelegate = nil;
      
      [self tearDownCoreDataStack];
      
      [super tearDown];
  }
  
  - (void)testThatProviderAsksForFetchRequestOnMonitoringStart {
      // given
      [self stubRequestFactory];
      
      // when
      [self.provider startMonitoring];
      
      // then
      OCMVerify([self.mockRequestFactory obtainFetchRequestForIndexing]);
  }
  
  - (void)testThatProviderProcessesObjectsForInitialIndexing {
      // given
      [self generateEventForTestPurposes];
      [self stubRequestFactory];
      [self.provider startMonitoring];
      
      // when
      __block NSString *result;
      [self.provider processObjectsForInitialIndexingWithBlock:^(NSString *objectType, NSString *objectIdentifier) {
          result = objectType;
      }];
      
      // then
      XCTAssertEqualObjects(result, NSStringFromClass([EventModelObject class]));
  }
  
  #pragma mark - Helper methods
  
  - (void)stubRequestFactory {
      NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Event"];
      request.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"startDate" ascending:YES]];
      OCMStub([self.mockRequestFactory obtainFetchRequestForIndexing]).andReturn(request);
  }
  
  - (EventModelObject *)generateEventForTestPurposes {
      NSManagedObjectContext *rootSavingContext = [NSManagedObjectContext MR_defaultContext];
      __block EventModelObject *event = nil;
      [rootSavingContext performBlockAndWait:^{
          event = [EventModelObject MR_createEntityInContext:rootSavingContext];
          event.startDate = [NSDate date];
          [rootSavingContext MR_saveToPersistentStoreAndWait];
      }];
      return event;
  }
  
  @end
  