Create unit test for color JSON

Package.resolved

@@ -1,6 +1,15 @@
 {
   "object": {
     "pins": [
+      {
+        "package": "RBBJSON",
+        "repositoryURL": "https://github.com/robb/RBBJSON",
+        "state": {
+          "branch": "main",
+          "revision": "102c970283e105d7c5be2e29630db29c808c20eb",
+          "version": null
+        }
+      },
       {
         "package": "swift-argument-parser",
         "repositoryURL": "https://github.com/apple/swift-argument-parser",

Package.swift

@@ -10,6 +10,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/apple/swift-argument-parser", .upToNextMinor(from: "0.3.1")),
+        .package(url: "https://github.com/robb/RBBJSON", .branch("main")),
     ],
     targets: [
         .target(
@@ -26,7 +27,10 @@ let package = Package(
         ),
         .testTarget(
             name: "MakeColorsTests",
-            dependencies: ["LibMakeColors"]
+            dependencies: [
+                "LibMakeColors",
+                .product(name: "RBBJSON", package: "RBBJSON"),
+            ]
         ),
     ]
 )

Sources/LibMakeColors/Generators/AssetCatalogGenerator.swift

@@ -58,7 +58,7 @@ private let infoTag = """
 }
 """
 
-private extension Color {
+extension Color {
     func json() -> String {
         """
         {

Tests/MakeColorsTests/AssetCatalogFormattingTest.swift

@@ -0,0 +1,26 @@
+@testable import LibMakeColors
+import RBBJSON
+import XCTest
+
+class AssetCatalogFormattingTest: XCTestCase {
+    func testColorProducedValidJSON() throws {
+        let color = Color(red: 0xFF, green: 0xF0, blue: 0x0F)
+        let data = Data(color.json().utf8)
+
+        let json = try JSONDecoder().decode(RBBJSON.self, from: data)
+
+        XCTAssertEqual(json.info.author, .string("de.5sw.MakeColors"))
+        XCTAssertEqual(json.info.version, .number(1))
+
+        XCTAssertEqual(Array(json.colors[any: .child]).count, 1)
+
+        XCTAssertEqual(json.colors[0].idiom, .string("universal"))
+
+        let jsonColor = json.colors[0].color
+        XCTAssertEqual(jsonColor["color-space"], .string("srgb"))
+        XCTAssertEqual(jsonColor.components.alpha, .string("1.0"))
+        XCTAssertEqual(jsonColor.components.red, .string("0xFF"))
+        XCTAssertEqual(jsonColor.components.green, .string("0xF0"))
+        XCTAssertEqual(jsonColor.components.blue, .string("0x0F"))
+    }
+}