/
LeagueTest.elm
248 lines (223 loc) · 9.6 KB
/
LeagueTest.elm
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module LeagueTest exposing (..)
import Dict exposing (Dict)
import Elo
import Expect
import Fuzz exposing (Fuzzer)
import Json.Decode as Decode
import Json.Encode as Encode
import League exposing (League, Match(..), Outcome(..))
import Player
import PlayerTest exposing (playerFuzzer)
import Test exposing (..)
initTests : Test
initTests =
describe "init"
[ test "starts with no players" <|
\_ ->
League.init
|> League.players
|> Expect.equal []
, test "starts without a current match" <|
\_ ->
League.init
|> League.currentMatch
|> Expect.equal Nothing
]
decoderTests : Test
decoderTests =
describe "decoder"
[ fuzz leagueFuzzer "encode and decode are symmetrical" <|
\league ->
League.encode league
|> Decode.decodeValue League.decoder
|> Expect.equal (Ok league)
, fuzz leagueFuzzer "is backwards-compatible with the older dictionary format" <|
\league ->
League.players league
|> List.map (\player -> ( player.name, Player.encode player ))
|> Encode.object
|> Decode.decodeValue League.decoder
-- matches played will change with this. That's fine.
|> Result.map League.players
|> Expect.equal (Ok (League.players league))
]
-- PLAYERS
playersTests : Test
playersTests =
describe "functionality around players"
[ fuzz playerFuzzer "adding a player makes them show up in the players list" <|
\player ->
League.init
|> League.addPlayer player
|> League.players
|> List.map .name
|> Expect.equal [ player.name ]
, fuzz playerFuzzer "retiring a player removes them from the players list" <|
\player ->
League.init
|> League.addPlayer player
|> League.retirePlayer player
|> League.players
|> Expect.equal []
]
-- MATCHES
startMatchTests : Test
startMatchTests =
describe "startMatch"
[ fuzz2 playerFuzzer playerFuzzer "you can't start a match when neither player is in the league" <|
\playerA playerB ->
League.init
|> League.startMatch (Match playerA playerB)
|> League.currentMatch
|> Expect.equal Nothing
, fuzz2 playerFuzzer playerFuzzer "you can't start a match when one player isn't in the league" <|
\playerA playerB ->
let
uniqueA =
{ playerA | name = "real " ++ playerA.name }
uniqueB =
{ playerB | name = "fake " ++ playerB.name }
in
League.init
|> League.addPlayer uniqueA
|> League.startMatch (Match uniqueA uniqueB)
|> League.currentMatch
|> Expect.equal Nothing
, fuzz2 playerFuzzer playerFuzzer "you can start a match between two players in the league" <|
\playerA playerBMaybeSame ->
let
playerB =
{ playerBMaybeSame | name = "unique " ++ playerBMaybeSame.name }
in
League.init
|> League.addPlayer playerA
|> League.addPlayer playerB
|> League.startMatch (Match playerA playerB)
|> League.currentMatch
|> Maybe.map (\(Match a b) -> ( a.name, b.name ))
|> Expect.equal (Just ( playerA.name, playerB.name ))
, fuzz playerFuzzer "you can't start a match with one player against themselves" <|
\player ->
League.init
|> League.addPlayer player
|> League.startMatch (Match player player)
|> League.currentMatch
|> Expect.equal Nothing
]
finishMatchTests : Test
finishMatchTests =
let
dummy =
Player.init "A"
league =
League.init
|> League.addPlayer dummy
in
describe "finishMatch"
[ describe "a win"
[ fuzz playerFuzzer "causes both players matches played to go up" <|
\winner ->
league
|> League.addPlayer winner
|> League.startMatch (Match winner dummy)
|> League.finishMatch (Win { won = winner, lost = dummy })
|> Expect.all
[ League.getPlayer winner.name
>> Maybe.map .matches
>> Expect.equal (Just (winner.matches + 1))
, League.getPlayer dummy.name
>> Maybe.map .matches
>> Expect.equal (Just (dummy.matches + 1))
]
, fuzz playerFuzzer "changes ratings according to Elo" <|
\winner ->
let
newRatings =
Elo.win (League.kFactor winner)
{ won = winner.rating
, lost = dummy.rating
}
in
league
|> League.addPlayer winner
|> League.startMatch (Match winner dummy)
|> League.finishMatch (Win { won = winner, lost = dummy })
|> Expect.all
[ League.getPlayer winner.name
>> Maybe.map .rating
>> Expect.equal (Just newRatings.won)
, League.getPlayer dummy.name
>> Maybe.map .rating
>> Expect.equal (Just newRatings.lost)
]
, fuzz playerFuzzer "does not change the total points in the system" <|
\winner ->
league
|> League.addPlayer winner
|> League.startMatch (Match winner dummy)
|> League.finishMatch (Win { won = winner, lost = dummy })
|> League.players
|> List.map .rating
|> List.sum
|> Expect.equal (winner.rating + dummy.rating)
]
, describe "a draw"
[ fuzz playerFuzzer "a draw causes both players matches played to go up" <|
\player ->
league
|> League.addPlayer player
|> League.startMatch (Match player dummy)
|> League.finishMatch (Draw { playerA = player, playerB = dummy })
|> Expect.all
[ League.getPlayer player.name
>> Maybe.map .matches
>> Expect.equal (Just (player.matches + 1))
, League.getPlayer dummy.name
>> Maybe.map .matches
>> Expect.equal (Just (dummy.matches + 1))
]
, fuzz playerFuzzer "a draw changes ratings according to Elo" <|
\player ->
let
newRatings =
Elo.draw
(League.kFactor
(if player.rating > dummy.rating then
player
else
dummy
)
)
{ playerA = player.rating
, playerB = dummy.rating
}
in
league
|> League.addPlayer player
|> League.startMatch (Match player dummy)
|> League.finishMatch (Draw { playerA = player, playerB = dummy })
|> Expect.all
[ League.getPlayer player.name
>> Maybe.map .rating
>> Expect.equal (Just newRatings.playerA)
, League.getPlayer dummy.name
>> Maybe.map .rating
>> Expect.equal (Just newRatings.playerB)
]
, fuzz playerFuzzer "a draw does not change the total points in the system" <|
\player ->
league
|> League.addPlayer player
|> League.startMatch (Match player dummy)
|> League.finishMatch (Draw { playerA = player, playerB = dummy })
|> League.players
|> List.map .rating
|> List.sum
|> Expect.equal (player.rating + dummy.rating)
]
]
-- FUZZERS
leagueFuzzer : Fuzzer League
leagueFuzzer =
Fuzz.list playerFuzzer
|> Fuzz.map (List.foldr League.addPlayer League.init)