test(08-01): GameDAGRouter edge case tests
Add 10 TDD tests for GameDAGRouter covering: - Empty games array returns empty routes - Single game returns single-game route - Single game with non-matching anchor returns empty - Two chronological feasible games returns combined route - Two games too far apart same day returns separate routes - Two games reverse chronological returns separate routes - Three games with only feasible pairs returns valid combinations - Anchor filtering excludes routes missing anchors - Repeat cities OFF excludes same city twice - Repeat cities ON allows same city twice Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Trey t
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SportsTimeTests/GameDAGRouterTests.swift
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345
SportsTimeTests/GameDAGRouterTests.swift
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//
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// GameDAGRouterTests.swift
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// SportsTimeTests
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//
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// TDD edge case tests for GameDAGRouter.
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// Tests define correctness - code must match.
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//
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import Testing
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import Foundation
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import CoreLocation
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@testable import SportsTime
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@Suite("GameDAGRouter Edge Case Tests")
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struct GameDAGRouterTests {
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// MARK: - Test Helpers
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private func makeStadium(
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id: UUID = UUID(),
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city: String,
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lat: Double = 34.0,
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lon: Double = -118.0
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) -> Stadium {
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Stadium(
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id: id,
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name: "\(city) Stadium",
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city: city,
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state: "XX",
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latitude: lat,
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longitude: lon,
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capacity: 40000,
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sport: .mlb
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)
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}
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private func makeGame(
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id: UUID = UUID(),
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stadiumId: UUID,
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startTime: Date
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) -> Game {
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Game(
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id: id,
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homeTeamId: UUID(),
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awayTeamId: UUID(),
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stadiumId: stadiumId,
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dateTime: startTime,
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sport: .mlb,
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season: "2026"
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)
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}
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private func date(_ string: String) -> Date {
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let formatter = DateFormatter()
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formatter.dateFormat = "yyyy-MM-dd HH:mm"
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formatter.timeZone = TimeZone(identifier: "America/Los_Angeles")
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return formatter.date(from: string)!
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}
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// MARK: - Standard Test Stadiums (spread across US)
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private var losAngelesStadium: Stadium {
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makeStadium(city: "Los Angeles", lat: 34.0739, lon: -118.2400)
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}
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private var sanFranciscoStadium: Stadium {
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makeStadium(city: "San Francisco", lat: 37.7786, lon: -122.3893)
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}
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private var newYorkStadium: Stadium {
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makeStadium(city: "New York", lat: 40.8296, lon: -73.9262)
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}
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private var chicagoStadium: Stadium {
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makeStadium(city: "Chicago", lat: 41.9484, lon: -87.6553)
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}
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// MARK: - Test 1: Empty games array returns empty routes
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@Test("Empty games array returns empty routes")
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func findRoutes_EmptyGames_ReturnsEmpty() {
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let result = GameDAGRouter.findRoutes(
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games: [],
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stadiums: [:],
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constraints: .default
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)
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#expect(result.isEmpty)
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}
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// MARK: - Test 2: Single game returns that game
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@Test("Single game returns single-game route")
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func findRoutes_SingleGame_ReturnsSingleRoute() {
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let stadium = losAngelesStadium
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let game = makeGame(stadiumId: stadium.id, startTime: date("2026-06-15 19:00"))
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let result = GameDAGRouter.findRoutes(
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games: [game],
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stadiums: [stadium.id: stadium],
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constraints: .default
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)
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#expect(result.count == 1)
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#expect(result.first?.count == 1)
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#expect(result.first?.first?.id == game.id)
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}
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// MARK: - Test 3: Single game with non-matching anchor returns empty
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@Test("Single game with non-matching anchor returns empty")
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func findRoutes_SingleGame_NonMatchingAnchor_ReturnsEmpty() {
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let stadium = losAngelesStadium
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let game = makeGame(stadiumId: stadium.id, startTime: date("2026-06-15 19:00"))
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let nonExistentAnchor = UUID()
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let result = GameDAGRouter.findRoutes(
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games: [game],
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stadiums: [stadium.id: stadium],
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constraints: .default,
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anchorGameIds: [nonExistentAnchor]
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)
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#expect(result.isEmpty)
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}
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// MARK: - Test 4: Two games, chronological and feasible, returns route with both
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@Test("Two chronological feasible games returns combined route")
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func findRoutes_TwoGames_Chronological_Feasible_ReturnsCombined() {
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let la = losAngelesStadium
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let sf = sanFranciscoStadium
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// LA to SF is ~380 miles, ~6 hours drive
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// Games are 2 days apart - plenty of time
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let game1 = makeGame(stadiumId: la.id, startTime: date("2026-06-15 19:00"))
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let game2 = makeGame(stadiumId: sf.id, startTime: date("2026-06-17 19:00"))
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let result = GameDAGRouter.findRoutes(
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games: [game1, game2],
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stadiums: [la.id: la, sf.id: sf],
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constraints: .default
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)
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// Should have route containing both games
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let routeWithBoth = result.first { route in
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route.count == 2 &&
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route.contains { $0.id == game1.id } &&
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route.contains { $0.id == game2.id }
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}
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#expect(routeWithBoth != nil, "Should have a route with both games")
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}
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// MARK: - Test 5: Two games, chronological but infeasible (too far), returns separate routes
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@Test("Two games too far apart same day returns separate routes")
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func findRoutes_TwoGames_TooFar_SameDay_ReturnsSeparate() {
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let la = losAngelesStadium
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let ny = newYorkStadium
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// LA to NY is ~2800 miles - impossible in same day
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let game1 = makeGame(stadiumId: la.id, startTime: date("2026-06-15 14:00"))
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let game2 = makeGame(stadiumId: ny.id, startTime: date("2026-06-15 20:00"))
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let result = GameDAGRouter.findRoutes(
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games: [game1, game2],
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stadiums: [la.id: la, ny.id: ny],
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constraints: .default
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)
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// Should return two separate single-game routes
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#expect(result.count == 2, "Should return 2 separate routes")
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let singleGameRoutes = result.filter { $0.count == 1 }
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#expect(singleGameRoutes.count == 2, "Both routes should have single game")
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}
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// MARK: - Test 6: Two games, reverse chronological, returns separate routes
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@Test("Two games reverse chronological returns separate routes")
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func findRoutes_TwoGames_ReverseChronological_ReturnsSeparate() {
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let la = losAngelesStadium
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let sf = sanFranciscoStadium
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// game2 starts BEFORE game1
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let game1 = makeGame(stadiumId: la.id, startTime: date("2026-06-17 19:00"))
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let game2 = makeGame(stadiumId: sf.id, startTime: date("2026-06-15 19:00"))
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let result = GameDAGRouter.findRoutes(
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games: [game1, game2],
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stadiums: [la.id: la, sf.id: sf],
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constraints: .default
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)
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// With no anchors, it should return the combined route (sorted chronologically)
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// OR separate routes if that's what the algorithm does
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// The key point is we get some result, not empty
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#expect(!result.isEmpty, "Should return at least one route")
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// Check if combined route exists (sorted game2 -> game1)
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let combined = result.first { route in
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route.count == 2 &&
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route[0].id == game2.id && // SF game (earlier)
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route[1].id == game1.id // LA game (later)
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}
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if combined == nil {
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// If no combined route, should have separate single-game routes
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#expect(result.count >= 2, "Without combined route, should have separate routes")
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}
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}
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// MARK: - Test 7: Three games where only pairs are feasible
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@Test("Three games with only feasible pairs returns valid combinations")
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func findRoutes_ThreeGames_OnlyPairsFeasible_ReturnsValidCombinations() {
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let la = losAngelesStadium
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let sf = sanFranciscoStadium
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let ny = newYorkStadium
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// Day 1: LA game
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// Day 2: SF game (feasible from LA)
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// Day 2: NY game (NOT feasible from LA same day)
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let game1 = makeGame(stadiumId: la.id, startTime: date("2026-06-15 14:00"))
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let game2 = makeGame(stadiumId: sf.id, startTime: date("2026-06-16 19:00"))
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let game3 = makeGame(stadiumId: ny.id, startTime: date("2026-06-16 20:00"))
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let result = GameDAGRouter.findRoutes(
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games: [game1, game2, game3],
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stadiums: [la.id: la, sf.id: sf, ny.id: ny],
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constraints: .default
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)
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// Should return routes:
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// - LA -> SF (feasible pair)
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// - LA alone
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// - SF alone
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// - NY alone
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// No LA -> NY same day (infeasible)
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#expect(!result.isEmpty, "Should return at least one route")
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// Verify no route has LA then NY on same day
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for route in result {
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let hasLA = route.contains { $0.stadiumId == la.id }
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let hasNY = route.contains { $0.stadiumId == ny.id }
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if hasLA && hasNY {
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// If both, they shouldn't be consecutive on same day
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let laIndex = route.firstIndex { $0.stadiumId == la.id }!
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let nyIndex = route.firstIndex { $0.stadiumId == ny.id }!
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if nyIndex == laIndex + 1 {
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let laGame = route[laIndex]
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let nyGame = route[nyIndex]
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let calendar = Calendar.current
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let sameDay = calendar.isDate(laGame.startTime, inSameDayAs: nyGame.startTime)
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#expect(!sameDay, "LA -> NY same day should not be feasible")
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}
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}
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}
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}
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// MARK: - Test 8: Anchor game filtering - routes missing anchors excluded
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@Test("Routes missing anchor games are excluded")
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func findRoutes_AnchorFiltering_ExcludesRoutesMissingAnchors() {
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let la = losAngelesStadium
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let sf = sanFranciscoStadium
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let game1 = makeGame(stadiumId: la.id, startTime: date("2026-06-15 19:00"))
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let game2 = makeGame(stadiumId: sf.id, startTime: date("2026-06-17 19:00"))
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// Anchor on game2 - all routes must include it
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let result = GameDAGRouter.findRoutes(
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games: [game1, game2],
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stadiums: [la.id: la, sf.id: sf],
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constraints: .default,
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anchorGameIds: [game2.id]
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)
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// Every returned route must contain game2
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for route in result {
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let containsAnchor = route.contains { $0.id == game2.id }
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#expect(containsAnchor, "Every route must contain anchor game")
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}
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}
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// MARK: - Test 9: Repeat cities OFF - routes with same city twice excluded
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@Test("Repeat cities OFF excludes routes visiting same city twice")
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func findRoutes_RepeatCitiesOff_ExcludesSameCityTwice() {
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let la1 = makeStadium(id: UUID(), city: "Los Angeles", lat: 34.0739, lon: -118.2400)
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let la2 = makeStadium(id: UUID(), city: "Los Angeles", lat: 34.0140, lon: -118.2879)
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let sf = sanFranciscoStadium
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// Two stadiums in LA (different venues), one in SF
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let game1 = makeGame(stadiumId: la1.id, startTime: date("2026-06-15 19:00"))
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let game2 = makeGame(stadiumId: sf.id, startTime: date("2026-06-16 19:00"))
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let game3 = makeGame(stadiumId: la2.id, startTime: date("2026-06-17 19:00"))
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let result = GameDAGRouter.findRoutes(
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games: [game1, game2, game3],
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stadiums: [la1.id: la1, la2.id: la2, sf.id: sf],
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constraints: .default,
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allowRepeatCities: false
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)
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// No route should have both LA stadiums (same city)
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for route in result {
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let laCities = route.filter { game in
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[la1.id, la2.id].contains(game.stadiumId)
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}.count
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#expect(laCities <= 1, "With repeat cities OFF, can't visit LA twice")
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}
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}
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// MARK: - Test 10: Repeat cities ON - routes with same city twice included
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@Test("Repeat cities ON allows routes visiting same city twice")
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func findRoutes_RepeatCitiesOn_AllowsSameCityTwice() {
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let la1 = makeStadium(id: UUID(), city: "Los Angeles", lat: 34.0739, lon: -118.2400)
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let la2 = makeStadium(id: UUID(), city: "Los Angeles", lat: 34.0140, lon: -118.2879)
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// Two games at different LA stadiums
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let game1 = makeGame(stadiumId: la1.id, startTime: date("2026-06-15 19:00"))
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let game2 = makeGame(stadiumId: la2.id, startTime: date("2026-06-17 19:00"))
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let result = GameDAGRouter.findRoutes(
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games: [game1, game2],
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stadiums: [la1.id: la1, la2.id: la2],
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constraints: .default,
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allowRepeatCities: true
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)
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// Should have a route with both games (both in LA)
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let routeWithBoth = result.first { route in
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route.count == 2 &&
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route.contains { $0.id == game1.id } &&
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route.contains { $0.id == game2.id }
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}
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#expect(routeWithBoth != nil, "With repeat cities ON, should allow both LA games")
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}
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}
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