Update the test cases

Tests/Tests/SDImageCacheTests.m

@@ -195,13 +195,13 @@ static NSString *kTestImageKeyPNG = @"TestImageKey.png";
 }
 
 - (void)test20InitialCacheSize{
-    expect([[SDImageCache sharedImageCache] getSize]).to.equal(0);
+    expect([[SDImageCache sharedImageCache] totalDiskSize]).to.equal(0);
 }
 
 - (void)test21InitialDiskCount{
     XCTestExpectation *expectation = [self expectationWithDescription:@"getDiskCount"];
     [[SDImageCache sharedImageCache] storeImage:[self testJPEGImage] forKey:kTestImageKeyJPEG completion:^{
-        expect([[SDImageCache sharedImageCache] getDiskCount]).to.equal(1);
+        expect([[SDImageCache sharedImageCache] totalDiskCount]).to.equal(1);
         [[SDImageCache sharedImageCache] removeImageForKey:kTestImageKeyJPEG withCompletion:^{
             [expectation fulfill];
         }];

Tests/Tests/SDWebImageTestCache.m

@@ -77,7 +77,7 @@
 }
 
 - (void)removeExpiredData {
-    NSDate *expirationDate = [NSDate dateWithTimeIntervalSinceNow:-self.config.maxCacheAge];
+    NSDate *expirationDate = [NSDate dateWithTimeIntervalSinceNow:-self.config.maxDiskAge];
     for (NSString *fileName in [self.fileManager enumeratorAtPath:self.cachePath]) {
         NSString *filePath = [self.cachePath stringByAppendingPathComponent:fileName];
         NSDate *modificationDate = [[self.fileManager attributesOfItemAtPath:filePath error:nil] objectForKey:NSFileModificationDate];