Added all methods of the cache module, almost all directly and some of them indirectly used

Unable to test sync call to diskImageExistsWithKey, hoped due to problems with the file manager and the test bundle being different from the main bundle

Tests/Tests/SDImageCacheTests.m

@@ -14,9 +14,10 @@
 
 #import "SDImageCache.h"
 
+NSString *kImageTestKey = @"TestImageKey";
 
 @interface SDImageCacheTests : XCTestCase
-
+@property (strong, nonatomic) SDImageCache *sharedImageCache;
 @end
 
 @implementation SDImageCacheTests
@@ -25,6 +26,8 @@
 {
     [super setUp];
     // Put setup code here. This method is called before the invocation of each test method in the class.
+    self.sharedImageCache = [SDImageCache sharedImageCache];
+    [self clearAllCaches];
 }
 
 - (void)tearDown
@@ -34,9 +37,165 @@
 }
 
 - (void)testSharedImageCache {
-    SDImageCache *sharedImageCache = [SDImageCache sharedImageCache];
+    expect(self.sharedImageCache).toNot.beNil();
+}
 
-    expect(sharedImageCache).toNot.beNil();
+- (void)testSingleton{
+    expect(self.sharedImageCache).to.equal([SDImageCache sharedImageCache]);
+}
+
+- (void)testClearDiskCache{
+    [self.sharedImageCache storeImage:[self imageForTesting] forKey:kImageTestKey];
+    [self.sharedImageCache clearDiskOnCompletion:^{
+        expect([self.sharedImageCache diskImageExistsWithKey:kImageTestKey]).to.equal(NO);
+        expect([self.sharedImageCache imageFromMemoryCacheForKey:kImageTestKey]).to.equal([self imageForTesting]);
+    }];
+}
+
+- (void)testClearMemoryCache{
+    [self.sharedImageCache storeImage:[self imageForTesting] forKey:kImageTestKey];
+    [self.sharedImageCache clearMemory];
+    expect([self.sharedImageCache imageFromMemoryCacheForKey:kImageTestKey]).to.beNil;
+    // Seems not able to access the files correctly (maybe only from test?)
+    //expect([self.sharedImageCache diskImageExistsWithKey:kImageTestKey]).to.equal(YES);
+    [self.sharedImageCache diskImageExistsWithKey:kImageTestKey completion:^(BOOL isInCache) {
+        expect(isInCache).to.equal(YES);
+    }];
+}
+
+// Testing storeImage:forKey:
+- (void)testInsertionOfImage {
+    UIImage *image = [self imageForTesting];
+    [self.sharedImageCache storeImage:image forKey:kImageTestKey];
+    expect([self.sharedImageCache imageFromMemoryCacheForKey:kImageTestKey]).to.equal(image);
+    expect([self.sharedImageCache imageFromDiskCacheForKey:kImageTestKey]).to.equal(image);
+}
+
+// Testing storeImage:forKey:toDisk:YES
+- (void)testInsertionOfImageForcingDiskStorage{
+    UIImage *image = [self imageForTesting];
+    [self.sharedImageCache storeImage:image forKey:kImageTestKey toDisk:YES];
+    expect([self.sharedImageCache imageFromMemoryCacheForKey:kImageTestKey]).to.equal(image);
+    // Seems not able to access the files correctly (maybe only from test?)
+    //expect([self.sharedImageCache diskImageExistsWithKey:kImageTestKey]).to.equal(YES);
+    [self.sharedImageCache diskImageExistsWithKey:kImageTestKey completion:^(BOOL isInCache) {
+        expect(isInCache).to.equal(YES);
+    }];
+}
+
+// Testing storeImage:forKey:toDisk:NO
+- (void)testInsertionOfImageOnlyInMemory {
+    UIImage *image = [self imageForTesting];
+    [self.sharedImageCache storeImage:image forKey:@"TestImage" toDisk:NO];
+    [self.sharedImageCache diskImageExistsWithKey:@"TestImage" completion:^(BOOL isInCache) {
+        expect(isInCache).to.equal(YES);
+    }];
+    [self.sharedImageCache clearMemory];
+    [self.sharedImageCache diskImageExistsWithKey:@"TestImage" completion:^(BOOL isInCache) {
+        expect(isInCache).to.equal(NO);
+    }];
+}
+
+- (void)testRetrievalImageThroughNSOperation{
+    //- (NSOperation *)queryDiskCacheForKey:(NSString *)key done:(SDWebImageQueryCompletedBlock)doneBlock;
+    UIImage *imageForTesting = [self imageForTesting];
+    [self.sharedImageCache storeImage:imageForTesting forKey:kImageTestKey];
+    NSOperation *operation = [self.sharedImageCache queryDiskCacheForKey:kImageTestKey done:^(UIImage *image, SDImageCacheType cacheType) {
+        expect(image).to.equal(imageForTesting);
+    }];
+    expect(operation).toNot.beNil;
+}
+
+- (void)testRemoveImageForKey{
+    [self.sharedImageCache storeImage:[self imageForTesting] forKey:kImageTestKey];
+    [self.sharedImageCache removeImageForKey:kImageTestKey];
+    expect([self.sharedImageCache imageFromMemoryCacheForKey:kImageTestKey]).to.beNil;
+    expect([self.sharedImageCache imageFromDiskCacheForKey:kImageTestKey]).to.beNil;
+}
+
+- (void)testRemoveImageForKeyWithCompletion{
+    [self.sharedImageCache storeImage:[self imageForTesting] forKey:kImageTestKey];
+    [self.sharedImageCache removeImageForKey:kImageTestKey withCompletion:^{
+        expect([self.sharedImageCache imageFromDiskCacheForKey:kImageTestKey]).to.beNil;
+        expect([self.sharedImageCache imageFromMemoryCacheForKey:kImageTestKey]).to.beNil;
+    }];
+}
+
+- (void)testRemoveImageForKeyNotFromDisk{
+    [self.sharedImageCache storeImage:[self imageForTesting] forKey:kImageTestKey];
+    [self.sharedImageCache removeImageForKey:kImageTestKey fromDisk:NO];
+    expect([self.sharedImageCache imageFromDiskCacheForKey:kImageTestKey]).toNot.beNil;
+    expect([self.sharedImageCache imageFromMemoryCacheForKey:kImageTestKey]).to.beNil;
+}
+
+- (void)testRemoveImageForKeyFromDisk{
+    [self.sharedImageCache storeImage:[self imageForTesting] forKey:kImageTestKey];
+    [self.sharedImageCache removeImageForKey:kImageTestKey fromDisk:NO];
+    expect([self.sharedImageCache imageFromDiskCacheForKey:kImageTestKey]).to.beNil;
+    expect([self.sharedImageCache imageFromMemoryCacheForKey:kImageTestKey]).to.beNil;
+}
+
+- (void)testRemoveImageforKeyNotFromDiskWithCompletion{
+    [self.sharedImageCache storeImage:[self imageForTesting] forKey:kImageTestKey];
+    [self.sharedImageCache removeImageForKey:kImageTestKey fromDisk:NO withCompletion:^{
+        expect([self.sharedImageCache imageFromDiskCacheForKey:kImageTestKey]).toNot.beNil;
+        expect([self.sharedImageCache imageFromMemoryCacheForKey:kImageTestKey]).to.beNil;
+    }];
+}
+
+- (void)testRemoveImageforKeyFromDiskWithCompletion{
+    [self.sharedImageCache storeImage:[self imageForTesting] forKey:kImageTestKey];
+    [self.sharedImageCache removeImageForKey:kImageTestKey fromDisk:YES withCompletion:^{
+        expect([self.sharedImageCache imageFromDiskCacheForKey:kImageTestKey]).to.beNil;
+        expect([self.sharedImageCache imageFromMemoryCacheForKey:kImageTestKey]).to.beNil;
+    }];
+}
+
+// TODO -- Testing insertion with recalculate
+- (void)testInsertionOfImageOnlyInDisk {
+}
+
+- (void)testInitialCacheSize{
+    expect([self.sharedImageCache getSize]).to.equal(0);
+}
+
+- (void)testInitialDiskCount{
+    [self.sharedImageCache storeImage:[self imageForTesting] forKey:kImageTestKey];
+    expect([self.sharedImageCache getDiskCount]).to.equal(1);
+}
+
+- (void)testDiskCountAfterInsertion{
+    [self.sharedImageCache storeImage:[self imageForTesting] forKey:kImageTestKey];
+    expect([self.sharedImageCache getDiskCount]).to.equal(1);
+}
+
+- (void)testDefaultCachePathForAnyKey{
+    NSString *path = [self.sharedImageCache defaultCachePathForKey:kImageTestKey];
+    expect(path).toNot.beNil;
+}
+
+- (void)testCachePathForNonExistingKey{
+    NSString *path = [self.sharedImageCache cachePathForKey:kImageTestKey inPath:[self.sharedImageCache defaultCachePathForKey:kImageTestKey]];
+    expect(path).to.beNil;
+}
+
+- (void)testCachePathForExistingKey{
+    [self.sharedImageCache storeImage:[self imageForTesting] forKey:kImageTestKey];
+    NSString *path = [self.sharedImageCache cachePathForKey:kImageTestKey inPath:[self.sharedImageCache defaultCachePathForKey:kImageTestKey]];
+    expect(path).notTo.beNil;
+}
+
+#pragma mark Helper methods
+
+- (void)clearAllCaches{
+    [self.sharedImageCache clearDisk];
+    [self.sharedImageCache clearMemory];
+}
+
+- (UIImage *)imageForTesting{
+    NSBundle *testBundle=[NSBundle bundleForClass:[self class]];
+    NSString *testBundlePath=[testBundle pathForResource:@"TestImage" ofType:@"jpg"];
+    return [UIImage imageWithContentsOfFile:testBundlePath];
 }
 
 @end