#import "../rules.typ": generate-moves-for
#import "../board.typ": starting-grid
#import "testutil.typ": assert-eq

// king,  no moves in starting position
#assert-eq(generate-moves-for(starting-grid, 5, 8, "white").len(), 0)

// pawn e2 → e3, e4
#let pmoves = generate-moves-for(starting-grid, 5, 7, "white")
#assert(pmoves.len() >= 2)
#assert-eq(pmoves.at(0), (5, 6))
#assert-eq(pmoves.at(1), (5, 5))

// knight b1 → a3, c3
#let km = generate-moves-for(starting-grid, 2, 8, "white")
#assert-eq(km.len(), 2)
#assert-eq(km.at(0), (1, 6))
#assert-eq(km.at(1), (3, 6))

// en passant: white pawn on a4 with ep = b6
#let ep-grid = (
  (".", ".", ".", ".", ".", ".", ".", "."),
  (".", ".", ".", ".", ".", ".", ".", "."),
  (".", ".", ".", ".", ".", ".", ".", "."),
  (".", "p", ".", ".", ".", ".", ".", "."),
  ("P", ".", ".", ".", ".", ".", ".", "."),
  (".", ".", ".", ".", ".", ".", ".", "."),
  (".", ".", ".", ".", ".", ".", ".", "."),
  (".", ".", ".", ".", ".", ".", ".", "."),
)
#let epm = generate-moves-for(ep-grid, 1, 5, "white", ep: (2, 3))
#let found = false
#for m in epm { if m.at(0) == 2 and m.at(1) == 3 { found = true; break } }
#assert(found)