Wire up Yellow's Route 18 gate trade cook (#651)

data/scripts/story5.lua

@@ -176,6 +176,20 @@ M.ROUTE_18_GATE_2F = {
       { "face_player" },
       { "trade", 6, "EVENT_TRADED_SLOWBRO_FOR_LICKITUNG" }, -- MARC
     },
+    -- Yellow replaces the youngster with a cook trading SPIKE
+    -- (TANGELA -> PARASECT): pokeyellow/scripts/Route18Gate2F.asm
+    -- Route18Gate2FCookText runs TRADE_FOR_SPIKE, index 6 in the Yellow
+    -- TradeMons table that Data:applyVersionedFieldData swaps in.  Red
+    -- maps have no COOK object here and Yellow maps have no YOUNGSTER,
+    -- so each version only ever fires its own row (#651).  Both rows
+    -- share the Red-flavoured done flag on purpose: a .sav tracks
+    -- "trade slot 6 completed" in one wCompletedInGameTradeFlags bit
+    -- either version reads, and the save codec maps that bit to this
+    -- flag name (src/save_convert/GenSave.lua EXTRA_FLAG_BITS).
+    TEXT_ROUTE18GATE2F_COOK = {
+      { "face_player" },
+      { "trade", 6, "EVENT_TRADED_SLOWBRO_FOR_LICKITUNG" }, -- SPIKE (Yellow)
+    },
   },
 }
 

tests/engine/save_convert_extra_flags.lua

@@ -105,7 +105,14 @@ for path in scripts:lines() do
   end
 end
 scripts:close()
-check(#TRADE_ROWS == 7, "the nine-row trade table's seven reachable trades are scripted")
+check(#TRADE_ROWS == 8, "all eight scripted trade rows are found")
+-- trade slot 6 is scripted twice: Red's youngster and Yellow's gate cook
+-- share the index and its done flag, one row per version (#651)
+local slot6 = 0
+for _, row in ipairs(TRADE_ROWS) do
+  if row.index == 6 then slot6 = slot6 + 1 end
+end
+eq(slot6, 2, "trade slot 6 has a row for each version")
 
 -- ------------------------------------------------------------------
 -- round trips

tests/parity_yellow_route18_gate_trade.lua

@@ -0,0 +1,58 @@
+-- Parity: Yellow's Route 18 Gate 2F trader is a cook offering SPIKE
+-- (TANGELA -> PARASECT), not Red's youngster (pokeyellow/scripts/
+-- Route18Gate2F.asm Route18Gate2FCookText, TRADE_FOR_SPIKE).  The port
+-- only wired TEXT_ROUTE18GATE2F_YOUNGSTER, so on Yellow the cook had no
+-- talk script at all and never answered (#651).
+package.path = "./?.lua;./?/init.lua;" .. package.path
+if not _G.love then _G.love = require("tests.love_stub") end
+
+local S = require("tests.harness").suite("parity Yellow route 18 gate trade")
+local check, eq = S.check, S.eq
+
+local scripts = require("data.scripts.init")
+
+local cook = scripts.talkScript("ROUTE_18_GATE_2F", "TEXT_ROUTE18GATE2F_COOK")
+check(cook ~= nil, "the Yellow cook has a talk script")
+if cook then
+  eq(cook[2][1], "trade", "the cook runs a trade")
+  eq(cook[2][2], 6, "the cook's trade is TRADE_FOR_SPIKE (index 6)")
+  eq(cook[2][3], "EVENT_TRADED_SLOWBRO_FOR_LICKITUNG",
+    "the cook shares slot 6's done flag, so a converted .sav stays done")
+end
+
+-- Red's youngster row stays put: trade 6 is MARC on Red's table and the
+-- two rows share the index across versions.
+local youngster = scripts.talkScript("ROUTE_18_GATE_2F", "TEXT_ROUTE18GATE2F_YOUNGSTER")
+check(youngster ~= nil, "Red's youngster keeps his talk script")
+if youngster then
+  eq(youngster[2][1], "trade", "the youngster runs a trade")
+  eq(youngster[2][2], 6, "the youngster's trade stays index 6")
+end
+
+-- Yellow's map only has the cook, so the new key is the one that fires.
+local manifestFile = assert(io.open("tools/rom_manifest_yellow.json", "r"))
+local manifest = manifestFile:read("*a")
+manifestFile:close()
+check(manifest:find('"name": "ROUTE18GATE2F_COOK"', 1, true) ~= nil,
+  "Yellow's Route18Gate2F object is the cook")
+check(manifest:find('"TEXT_ROUTE18GATE2F_COOK"', 1, true) ~= nil,
+  "the cook carries TEXT_ROUTE18GATE2F_COOK")
+check(manifest:find("ROUTE18GATE2F_YOUNGSTER", 1, true) == nil,
+  "Yellow's Route18Gate2F has no youngster")
+
+-- The Yellow table makes index 6 the SPIKE row (TANGELA -> PARASECT).
+local Data = require("src.core.Data")
+if not (Data.field and Data.field.trades) then Data:load() end
+local GameVersion = require("src.core.GameVersion")
+local oldVersion = GameVersion.get()
+local oldTrades = Data.field.trades
+GameVersion.set("yellow")
+Data:applyVersionedFieldData()
+local spike = Data.field.trades[6]
+check(spike.give == "TANGELA" and spike.get == "PARASECT"
+  and spike.nickname == "SPIKE",
+  "on Yellow trade 6 is SPIKE (TANGELA -> PARASECT)")
+Data.field.trades = oldTrades
+GameVersion.set(oldVersion)
+
+S.finish()