add test case

Tests/Tests/SDImageCoderTests.m

@@ -311,6 +311,27 @@
     }
 }
 
+- (void)test22DoNotDecodeImageWhenApplicationWillTerminate {
+    /// Just create SDImageCodersManager advance
+    [SDImageCodersManager sharedManager];
+    XCTestExpectation *expectation = [self expectationWithDescription:@"doNotDecodeImageWhenApplicationWillTerminate"];
+    NSString *testImagePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"TestImageLarge" ofType:@"png"];
+    NSData *testImageData = [NSData dataWithContentsOfFile:testImagePath];
+    [[SDImageCache sharedImageCache] storeImageDataToDisk:testImageData forKey:@"TestImageLarge"];
+    NSOperation *operation = [[SDImageCache sharedImageCache] queryCacheOperationForKey:@"TestImageLarge" done:^(UIImage *image, NSData *data, SDImageCacheType cacheType) {
+        expect(data).to.equal(testImageData);
+        expect(image).to.beNil;
+        [[SDImageCache sharedImageCache] removeImageForKey:@"TestImageLarge" withCompletion:^{
+            [expectation fulfill];
+        }];
+    }];
+    expect(operation).toNot.beNil;
+    [operation start];
+    [[NSNotificationCenter defaultCenter] postNotificationName:UIApplicationWillTerminateNotification object:nil];
+    
+    [self waitForExpectationsWithCommonTimeout];
+}
+
 #pragma mark - Utils
 
 - (void)verifyCoder:(id<SDImageCoder>)coder