Add test for downsampling from image

Kingfisher.xcodeproj/project.pbxproj

@@ -219,6 +219,9 @@
 		D1BA781E2174D07800C69D7B /* CallbackQueue.swift in Sources */ = {isa = PBXBuildFile; fileRef = D1BA781C2174D07800C69D7B /* CallbackQueue.swift */; };
 		D1BA781F2174D07800C69D7B /* CallbackQueue.swift in Sources */ = {isa = PBXBuildFile; fileRef = D1BA781C2174D07800C69D7B /* CallbackQueue.swift */; };
 		D1BA78202174D07800C69D7B /* CallbackQueue.swift in Sources */ = {isa = PBXBuildFile; fileRef = D1BA781C2174D07800C69D7B /* CallbackQueue.swift */; };
+		D1BFED95222ACC6B009330C8 /* ImageProcessorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = D1BFED94222ACC6B009330C8 /* ImageProcessorTests.swift */; };
+		D1BFED96222ACC6B009330C8 /* ImageProcessorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = D1BFED94222ACC6B009330C8 /* ImageProcessorTests.swift */; };
+		D1BFED97222ACC6B009330C8 /* ImageProcessorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = D1BFED94222ACC6B009330C8 /* ImageProcessorTests.swift */; };
 		D1D2C32A1C70A3230018F2F9 /* single-frame.gif in Resources */ = {isa = PBXBuildFile; fileRef = D1D2C3291C70A3230018F2F9 /* single-frame.gif */; };
 		D1D2C32B1C70A3230018F2F9 /* single-frame.gif in Resources */ = {isa = PBXBuildFile; fileRef = D1D2C3291C70A3230018F2F9 /* single-frame.gif */; };
 		D1D2C32C1C70A3230018F2F9 /* single-frame.gif in Resources */ = {isa = PBXBuildFile; fileRef = D1D2C3291C70A3230018F2F9 /* single-frame.gif */; };
@@ -350,6 +353,7 @@
 		D1A37BEC215D375F009B39B7 /* Deprecated.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Deprecated.swift; sourceTree = "<group>"; };
 		D1A37BF1215D3850009B39B7 /* SizeExtensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SizeExtensions.swift; sourceTree = "<group>"; };
 		D1BA781C2174D07800C69D7B /* CallbackQueue.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CallbackQueue.swift; sourceTree = "<group>"; };
+		D1BFED94222ACC6B009330C8 /* ImageProcessorTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ImageProcessorTests.swift; sourceTree = "<group>"; };
 		D1D2C3291C70A3230018F2F9 /* single-frame.gif */ = {isa = PBXFileReference; lastKnownFileType = image.gif; path = "single-frame.gif"; sourceTree = "<group>"; };
 		D1DC4B401D60996D00DFDFAA /* StringExtensionTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = StringExtensionTests.swift; sourceTree = "<group>"; };
 		D1E564402199C21E0057AAE3 /* StorageExpirationTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StorageExpirationTests.swift; sourceTree = "<group>"; };
@@ -596,6 +600,7 @@
 				4BCFF7A9219932390055AAC4 /* DiskStorageTests.swift */,
 				D1E564402199C21E0057AAE3 /* StorageExpirationTests.swift */,
 				D1A1CC9E21A0F98600263AD8 /* ImageDataProviderTests.swift */,
+				D1BFED94222ACC6B009330C8 /* ImageProcessorTests.swift */,
 			);
 			name = KingfisherTests;
 			path = Tests/KingfisherTests;
@@ -1122,6 +1127,7 @@
 				D1A1CCA021A0F98600263AD8 /* ImageDataProviderTests.swift in Sources */,
 				4B8351C9217066580081EED8 /* StubHelpers.swift in Sources */,
 				D1DC4B421D60996D00DFDFAA /* StringExtensionTests.swift in Sources */,
+				D1BFED96222ACC6B009330C8 /* ImageProcessorTests.swift in Sources */,
 				D12E0C741C47F6FE00AC98AD /* UIButtonExtensionTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -1146,6 +1152,7 @@
 				D1A1CCA121A0F98600263AD8 /* ImageDataProviderTests.swift in Sources */,
 				4B8351CA217066580081EED8 /* StubHelpers.swift in Sources */,
 				D1DC4B431D60996D00DFDFAA /* StringExtensionTests.swift in Sources */,
+				D1BFED97222ACC6B009330C8 /* ImageProcessorTests.swift in Sources */,
 				D12E0C871C47F7AF00AC98AD /* KingfisherOptionsInfoTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -1318,6 +1325,7 @@
 				D1A1CC9F21A0F98600263AD8 /* ImageDataProviderTests.swift in Sources */,
 				4B8351C8217066580081EED8 /* StubHelpers.swift in Sources */,
 				D1DC4B411D60996D00DFDFAA /* StringExtensionTests.swift in Sources */,
+				D1BFED95222ACC6B009330C8 /* ImageProcessorTests.swift in Sources */,
 				D12E0C501C47F23500AC98AD /* ImageCacheTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;

Tests/KingfisherTests/ImageProcessorTests.swift

@@ -0,0 +1,48 @@
+//
+//  ImageProcessorTests.swift
+//  Kingfisher
+//
+//  Created by onevcat on 2019/03/02.
+//
+//  Copyright (c) 2019 Wei Wang <onevcat@gmail.com>
+//
+//  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
+import Kingfisher
+
+class ImageProcessorTests: XCTestCase {
+
+    // Issue 1125. https://github.com/onevcat/Kingfisher/issues/1125
+    func testDownsamplingSizes() {
+        XCTAssertEqual(testImage.size, CGSize(width: 64, height: 64))
+
+        let emptyOption = KingfisherParsedOptionsInfo(nil)
+
+        let targetSize = CGSize(width: 20, height: 40)
+        let downsamplingProcessor = DownsamplingImageProcessor(size: targetSize)
+
+        let resultFromData = downsamplingProcessor.process(item: .data(testImageData), options: emptyOption)
+        XCTAssertEqual(resultFromData!.size, CGSize(width: 40, height: 40))
+
+        let resultFromImage = downsamplingProcessor.process(item: .image(testImage), options: emptyOption)
+        XCTAssertEqual(resultFromImage!.size, CGSize(width: 40, height: 40))
+
+    }
+}