Fix missing variant cases

Sources/ThemePark/Style.swift

@@ -118,10 +118,12 @@ public struct Variant: Hashable, Sendable {
 }
 
 extension Variant: CaseIterable {
-	public static var allCases: [Variant] {
-		zip(ColorScheme.allCases, ColorSchemeContrast.allCases)
-			.map { Variant(colorScheme: $0, colorSchemeContrast: $1) }
-	}
+	public static let allCases: [Variant] = [
+		Variant(colorScheme: .light, colorSchemeContrast: .standard),
+		Variant(colorScheme: .light, colorSchemeContrast: .increased),
+		Variant(colorScheme: .dark, colorSchemeContrast: .standard),
+		Variant(colorScheme: .dark, colorSchemeContrast: .increased),
+	]
 }
 
 extension Variant: Codable {

Tests/ThemeParkTests/CodableStylerTests.swift

@@ -0,0 +1,71 @@
+import XCTest
+import ThemePark
+
+struct MockStyler: Styling {
+	func style(for query: Query) -> Style {
+		switch query.key {
+		case .editor(.background), .editor(.accessoryBackground):
+			return Style(color: .red)
+		default:
+			return Style(color: .blue)
+		}
+	}
+
+	var supportedVariants: Set<Variant> {
+		[Variant(colorScheme: .light)]
+	}
+}
+
+final class CodableStylerTests: XCTestCase {
+	func testPassthrough() throws {
+		let mock = MockStyler()
+		let theme = CodableStyler(mock)
+		let context = Query.Context(controlState: .active, variant: Variant(colorScheme: .light))
+
+		XCTAssertEqual(
+			mock.style(for: .editor(.background), context: context),
+			theme.style(for: .editor(.background), context: context)
+		)
+
+		XCTAssertEqual(
+			mock.style(for: .syntax(.text), context: context),
+			theme.style(for: .syntax(.text), context: context)
+		)
+	}
+
+	func testPassthroughMismatchedVariant() throws {
+		let mock = MockStyler()
+		let theme = CodableStyler(mock)
+		let context = Query.Context(controlState: .active, variant: Variant(colorScheme: .dark))
+
+		XCTAssertEqual(
+			mock.style(for: .editor(.background), context: context),
+			theme.style(for: .editor(.background), context: context)
+		)
+
+		XCTAssertEqual(
+			mock.style(for: .syntax(.text), context: context),
+			theme.style(for: .syntax(.text), context: context)
+		)
+	}
+
+	func testEncodedDecodedPassthrough() throws {
+		let mock = MockStyler()
+		let theme = CodableStyler(mock)
+		let context = Query.Context(controlState: .active, variant: Variant(colorScheme: .light))
+
+		let data = try JSONEncoder().encode(theme)
+		let decodedTheme = try JSONDecoder().decode(CodableStyler.self, from: data)
+
+
+		XCTAssertEqual(
+			mock.style(for: .editor(.background), context: context),
+			decodedTheme.style(for: .editor(.background), context: context)
+		)
+
+		XCTAssertEqual(
+			mock.style(for: .syntax(.text), context: context),
+			decodedTheme.style(for: .syntax(.text), context: context)
+		)
+	}
+}