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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
import Common
import UIKit
import XCTest
@testable import ComponentLibrary
@MainActor
final class GradientViewTests: XCTestCase {
func test_layerClass_isGradientLayer() {
let subject = GradientView()
XCTAssertTrue(subject.layer is CAGradientLayer)
}
func test_configure_setsColorsAndGeometry() throws {
let subject = GradientView()
let gradient = Gradient(colors: [.red, .blue])
subject.configure(gradient: gradient,
startPoint: CGPoint(x: 0, y: 0.5),
endPoint: CGPoint(x: 1, y: 0.5),
locations: [0, 1])
let layer = try XCTUnwrap(subject.layer as? CAGradientLayer)
XCTAssertEqual(layer.colors as? [CGColor], gradient.cgColors)
XCTAssertEqual(layer.startPoint, CGPoint(x: 0, y: 0.5))
XCTAssertEqual(layer.endPoint, CGPoint(x: 1, y: 0.5))
XCTAssertEqual(layer.locations, [0, 1])
}
func test_configureWithNilGradient_clearsColorsLeavingBackground() {
let subject = GradientView()
subject.backgroundColor = .green
subject.configure(gradient: Gradient(colors: [.red, .blue]))
subject.configure(gradient: nil)
let layer = subject.layer as? CAGradientLayer
XCTAssertNil(layer?.colors)
XCTAssertEqual(subject.backgroundColor, .green)
}
/// The gradient tracks the bounds automatically, unlike a manually inserted sublayer.
func test_layerFrame_followsBounds() {
let subject = GradientView()
subject.frame = CGRect(x: 0, y: 0, width: 120, height: 40)
subject.layoutIfNeeded()
XCTAssertEqual(subject.layer.bounds.size, CGSize(width: 120, height: 40))
}
}