Fix failing tests for different color space

Demo/Kingfisher-Demo/ViewController.swift

@@ -97,4 +97,3 @@ extension ViewController: UICollectionViewDataSourcePrefetching {
         ImagePrefetcher(urls: urls).start()
     }
 }
-

Sources/ImageProcessor.swift

@@ -688,7 +688,7 @@ public func >>(left: ImageProcessor, right: ImageProcessor) -> ImageProcessor {
     return left.append(another: right)
 }
 
-fileprivate extension Color {
+extension Color {
     var hex: String {
         var r: CGFloat = 0
         var g: CGFloat = 0
@@ -696,7 +696,7 @@ fileprivate extension Color {
         var a: CGFloat = 0
 
         #if os(macOS)
-        (usingColorSpace(.genericRGB) ?? self).getRed(&r, green: &g, blue: &b, alpha: &a)
+        (usingColorSpace(.sRGB) ?? self).getRed(&r, green: &g, blue: &b, alpha: &a)
         #else
         getRed(&r, green: &g, blue: &b, alpha: &a)
         #endif

Tests/KingfisherTests/ImageProcessorTests.swift

@@ -25,7 +25,7 @@
 //  THE SOFTWARE.
 
 import XCTest
-import Kingfisher
+@testable import Kingfisher
 
 #if os(macOS)
 import AppKit
@@ -70,7 +70,7 @@ class ImageProcessorTests: XCTestCase {
     #if os(macOS)
     func testCompositingProcessor() {
         let p = CompositingImageProcessor(compositingOperation: .darken, alpha: 1.0, backgroundColor: .lightGray)
-        XCTAssertEqual(p.identifier, "com.onevcat.Kingfisher.CompositingImageProcessor(\(NSCompositingOperation.darken.rawValue),\(p.alpha))_#aaaaaaff")
+        XCTAssertEqual(p.identifier, "com.onevcat.Kingfisher.CompositingImageProcessor(\(NSCompositingOperation.darken.rawValue),\(p.alpha))_\(Color.lightGray.hex)")
         checkProcessor(p, with: "compositing-\(NSCompositingOperation.darken.rawValue)")
     }
     #endif
@@ -127,18 +127,18 @@ class ImageProcessorTests: XCTestCase {
     
     func testOverlayProcessor() {
         let p1 = OverlayImageProcessor(overlay: .red)
-        XCTAssertEqual(p1.identifier, "com.onevcat.Kingfisher.OverlayImageProcessor(#ff0000ff_0.5)")
+        XCTAssertEqual(p1.identifier, "com.onevcat.Kingfisher.OverlayImageProcessor(\(Color.red.hex)_0.5)")
         checkProcessor(p1, with: "overlay-red")
         
         let p2 = OverlayImageProcessor(overlay: .red, fraction: 0.7)
-        XCTAssertEqual(p2.identifier, "com.onevcat.Kingfisher.OverlayImageProcessor(#ff0000ff_0.7)")
+        XCTAssertEqual(p2.identifier, "com.onevcat.Kingfisher.OverlayImageProcessor(\(Color.red.hex)_0.7)")
         checkProcessor(p2, with: "overlay-red-07")
     }
 
     func testTintProcessor() {
         let color = Color.yellow.withAlphaComponent(0.2)
         let p = TintImageProcessor(tint: color)
-        XCTAssertEqual(p.identifier, "com.onevcat.Kingfisher.TintImageProcessor(#ffff0033)")
+        XCTAssertEqual(p.identifier, "com.onevcat.Kingfisher.TintImageProcessor(\(color.hex))")
         checkProcessor(p, with: "tint-yellow-02")
     }