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Additional tests
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@tevelee
tevelee committed Apr 23, 2024
1 parent e399d68 commit 051ef1d
Showing 1 changed file with 206 additions and 35 deletions.
241 changes: 206 additions & 35 deletions Tests/FlowTests/FlowTests.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,8 @@ import SwiftUI
import XCTest
@testable import Flow

@available(iOS 16.0, macOS 13.0, tvOS 16.0, watchOS 9.0, *)
final class FlowTests: XCTestCase {
@available(iOS 16.0, macOS 13.0, tvOS 16.0, watchOS 9.0, *)
func test_HFlow_size_singleElement() throws {
// Given
let views = [
Expand All @@ -18,7 +18,6 @@ final class FlowTests: XCTestCase {
XCTAssertEqual(size, CGSize(width: 50, height: 50))
}

@available(iOS 16.0, macOS 13.0, tvOS 16.0, watchOS 9.0, *)
func test_HFlow_size_multipleElements() throws {
// Given
let views = [
Expand All @@ -35,53 +34,216 @@ final class FlowTests: XCTestCase {
XCTAssertEqual(size, CGSize(width: 110, height: 120))
}

@available(iOS 16.0, macOS 13.0, tvOS 16.0, watchOS 9.0, *)
func test_HFlow_placement_centerAlignment() throws {
func test_HFlow_layout_top() {
// Given
let views = [
TestSubview(width: 50, height: 60),
TestSubview(width: 50, height: 30),
TestSubview(width: 50, height: 60)
]
let sut: FlowLayout = .horizontal(alignment: .center, itemSpacing: 10, lineSpacing: 20)
let sut: FlowLayout = .horizontal(alignment: .top, itemSpacing: 1, lineSpacing: 1)

// When
let result = sut.layout([5×1, 5×3, 5×1, 5×1], in: 20×6)

// Then
XCTAssertEqual(render(result), """
+--------------------+
|XXXXX XXXXX XXXXX |
| XXXXX |
| XXXXX |
| |
|XXXXX |
| |
+--------------------+
""")
}

func test_HFlow_layout_center() {
// Given
let sut: FlowLayout = .horizontal(alignment: .center, itemSpacing: 1, lineSpacing: 1)

// When
sut.placeSubviews(in: CGRect(origin: .zero, size: CGSize(width: 150, height: 150)),
proposal: ProposedViewSize(width: 120, height: 150),
subviews: views)
let result = sut.layout([5×1, 5×3, 5×1, 5×1], in: 20×6)

// Then
XCTAssertEqual(views[0].placement, CGPoint(x: 0, y: 0))
XCTAssertEqual(views[1].placement, CGPoint(x: 60, y: 15))
XCTAssertEqual(views[2].placement, CGPoint(x: 0, y: 80))
XCTAssertEqual(render(result), """
+--------------------+
| XXXXX |
|XXXXX XXXXX XXXXX |
| XXXXX |
| |
|XXXXX |
| |
+--------------------+
""")
}

@available(iOS 16.0, macOS 13.0, tvOS 16.0, watchOS 9.0, *)
func test_HFlow_placement_topAlignment() throws {

func test_HFlow_layout_bottom() {
// Given
let views = [
TestSubview(width: 50, height: 30),
TestSubview(width: 50, height: 50),
TestSubview(width: 50, height: 30),
TestSubview(width: 50, height: 60),
]
let sut: FlowLayout = .horizontal(alignment: .top, itemSpacing: 10, lineSpacing: 20)
let sut: FlowLayout = .horizontal(alignment: .bottom, itemSpacing: 1, lineSpacing: 1)

// When
let result = sut.layout([5×1, 5×3, 5×1, 5×1], in: 20×6)

// Then
XCTAssertEqual(render(result), """
+--------------------+
| XXXXX |
| XXXXX |
|XXXXX XXXXX XXXXX |
| |
|XXXXX |
| |
+--------------------+
""")
}

func test_HFlow_layout() {
// Given
let sut: FlowLayout = .horizontal(alignment: .center, itemSpacing: 1, lineSpacing: 0)

// When
let result = sut.layout(Array(repeating: 1×1, count: 15), in: 11×3)

// Then
XCTAssertEqual(render(result), """
+-----------+
|X X X X X X|
|X X X X X X|
|X X X |
+-----------+
""")
}

func test_VFlow_layout_leading() {
// Given
let sut: FlowLayout = .vertical(alignment: .leading, itemSpacing: 1, lineSpacing: 1)

// When
let result = sut.layout([1×1, 3×1, 1×1, 1×1, 1×1], in: 5×5)

// Then
XCTAssertEqual(render(result), """
+-----+
|X X|
| |
|XXX X|
| |
|X |
+-----+
""")
}
func test_VFlow_layout_center() {
// Given
let sut: FlowLayout = .vertical(alignment: .center, itemSpacing: 1, lineSpacing: 1)

// When
sut.placeSubviews(in: CGRect(origin: .zero, size: CGSize(width: 100, height: 100)),
proposal: ProposedViewSize(width: 120, height: 120),
subviews: views)
let result = sut.layout([1×1, 3×1, 1×1, 1×1, 1×1], in: 5×5)

// Then
XCTAssertEqual(views[0].placement, CGPoint(x: 0, y: 0))
XCTAssertEqual(views[1].placement, CGPoint(x: 60, y: 0))
XCTAssertEqual(views[2].placement, CGPoint(x: 0, y: 70))
XCTAssertEqual(views[3].placement, CGPoint(x: 60, y: 70))
XCTAssertEqual(render(result), """
+-----+
| X X|
| |
|XXX X|
| |
| X |
+-----+
""")
}

func test_VFlow_layout_trailing() {
// Given
let sut: FlowLayout = .vertical(alignment: .trailing, itemSpacing: 1, lineSpacing: 1)

// When
let result = sut.layout([1×1, 3×1, 1×1, 1×1, 1×1], in: 5×5)

// Then
XCTAssertEqual(render(result), """
+-----+
| X X|
| |
|XXX X|
| |
| X |
+-----+
""")
}

func test_VFlow_layout() {
// Given
let sut: FlowLayout = .vertical(alignment: .center, itemSpacing: 0, lineSpacing: 0)

// When
let result = sut.layout(Array(repeating: 1×1, count: 17), in: 6×3)

// Then
XCTAssertEqual(render(result), """
+------+
|XXXXXX|
|XXXXXX|
|XXXXX |
+------+
""")
}
}

private extension FlowLayout {
func layout(_ views: [CGSize], in bounds: CGSize) -> (subviews: [TestSubview], size: CGSize) {
let subviews = views.map { TestSubview(width: $0.width, height: $0.height) }
let size = sizeThatFits(
proposal: ProposedViewSize(width: bounds.width, height: bounds.height),
subviews: subviews
)
placeSubviews(
in: CGRect(origin: .zero, size: bounds),
proposal: ProposedViewSize(width: size.width, height: size.height),
subviews: subviews
)
return (subviews, bounds)
}
}

private func render(_ layout: (subviews: [TestSubview], size: CGSize), border: Bool = true) -> String {
struct Point: Hashable {
let x, y: Int
}

var positions: Set<Point> = []
for view in layout.subviews {
if let point = view.placement {
for y in Int(point.y) ..< Int(point.y + view.size.height) {
for x in Int(point.x) ..< Int(point.x + view.size.width) {
positions.insert(Point(x: x, y: y))
}
}
}
}
let width = Int(layout.size.width)
let height = Int(layout.size.height)
var result = ""
if border {
result += "+" + String(repeating: "-", count: width) + "+\n"
}
for y in 0 ... height - 1 {
if border {
result += "|"
}
for x in 0 ... width - 1 {
result += positions.contains(Point(x: x, y: y)) ? "X" : " "
}
if border {
result += "|"
} else {
result = result.trimmingCharacters(in: .whitespaces)
}
result += "\n"
}
if border {
result += "+" + String(repeating: "-", count: width) + "+\n"
}
return result.trimmingCharacters(in: .newlines)
}

@available(iOS 16.0, macOS 13.0, tvOS 16.0, watchOS 9.0, *)
private final class TestSubview: Subview {
private final class TestSubview: Subview, CustomStringConvertible {
var spacing = ViewSpacing()
var placement: CGPoint?
let size: CGSize
Expand All @@ -101,10 +263,14 @@ private final class TestSubview: Subview {
func place(at position: CGPoint, anchor: UnitPoint, proposal: ProposedViewSize) {
placement = position
}

var description: String {
"origin: \((placement?.x).map { "\($0)" } ?? "nil")×\((placement?.y).map { "\($0)" } ?? "nil"), size: \(size.width)×\(size.height)"
}
}

@available(iOS 16.0, macOS 13.0, tvOS 16.0, watchOS 9.0, *)
extension Array: Subviews where Element == TestSubview {}
extension [TestSubview]: Subviews {}

private struct TestDimensions: Dimensions {
let size: CGSize
Expand All @@ -125,3 +291,8 @@ private struct TestDimensions: Dimensions {
}
}
}

infix operator ×: MultiplicationPrecedence
private func × (lhs: CGFloat, rhs: CGFloat) -> CGSize {
CGSize(width: lhs, height: rhs)
}

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