► |  | Games: Fun Examples

1 | Bundled Games
2 | Implementing New Games
3 | Showing Scribbled Help
4 | Showing Text Help

► | 1 | Bundled Games

1.1 | Aces – Solitaire Card Game
1.2 | Go Fish – Kid’s Card Game
1.3 | Crazy 8s – Card Game
1.4 | Blackjack – 21 Card Game
1.5 | Rummy – Card Game
1.6 | Spider – Solitaire Card Game
1.7 | Memory – Kid’s Game
1.8 | Slidey – Picture Puzzle
1.9 | Same – Dot-Removing Game
1.10 | Minesweeper – Logic Game
1.11 | Paint By Numbers – Logic Game
1.12 | Lights Out – Logic Game
1.13 | Pousse – Tic-Tac-Toe-like Game
1.14 | Gobblet – Strategy Game
1.15 | Jewel – 3-D Skill Game
1.16 | Parcheesi – Board Game
1.17 | Checkers – Board Game
1.18 | Chat Noir – Puzzle Game
1.19 | GCalc – Visual λ-Calculus

▼ | 1.18 | Chat Noir – Puzzle Game

1.18.1 | Overview
1.18.2 | The World
1.18.3 | Breadth-first Search
1.18.4 | Board to Graph
1.18.5 | The Cat’s Path
1.18.6 | Drawing the Cat
1.18.7 | Drawing the World
1.18.8 | Handling Input
1.18.9 | Tests
1.18.10 | Run, program, run

On this page:

<test-infrastructure>
<lookup-in-table-tests>
<build-bfs-table-tests>2
<neighbors-tests>4
<adjacent-tests>2
<on-boundary?-tests>
<in-bounds?-tests>
<on-cats-path?-tests>2
<+/f-tests>
<render-world-tests>
<chop-whiskers-tests>2
<render-board-tests>
<render-cell-tests>
<world-size-tests>
<cell-center-x-tests>3
<cell-center-y-tests>2
<clack-tests>
<update-world-posn-tests>
<move-cat-tests>
<change-tests>
<point-in-this-circle?-tests>3
<find-best-positions-tests>
<lt/f-tests>
<circle-at-point-tests>
<blocked-cells-tests>

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##### 1.18.9`` Tests

This section consists of some infrastructure for maintaining tests, plus a pile of additional tests for the other functions in this document.

The test and test/set macros package up their arguments into thunks and then simply call test/proc, supplying information about the source location of the test case. The test/proc function runs the tests and reports the results.

<test-infrastructure> ::=

(define-syntax (test stx)
(syntax-case stx ()
[(_ actual expected)
(with-syntax ([line (syntax-line stx)]
[pos (syntax-position stx)])
#'(test/proc (λ () actual)
(λ () expected)
equal?
line
'actual))]))
(define-syntax (test/set stx)
(syntax-case stx ()
[(_ actual expected)
(with-syntax ([line (syntax-line stx)]
[pos (syntax-position stx)])
#'(test/proc (λ () actual)
(λ () expected)
(λ (x y) (same-sets? x y))
line
'actual))]))
(define test-count 0)
(define (test/proc actual-thunk expected-thunk cmp line sexp)
(set! test-count (+ test-count 1))
(let ([actual (actual-thunk)]
[expected (expected-thunk)])
(unless (cmp actual expected)
(error 'check-expect "test #~a~a\n ~s\n ~s\n"
test-count
(if line
(format " on line ~a failed:" line)
(format " failed: ~s" sexp))
actual
expected))))
(define (same-sets? l1 l2)
(and (andmap (lambda (e1) (member e1 l2)) l1)
(andmap (lambda (e2) (member e2 l1)) l2)
#t))
(test (same-sets? (list) (list)) #t)
(test (same-sets? (list) (list 1)) #f)
(test (same-sets? (list 1) (list)) #f)
(test (same-sets? (list 1 2) (list 2 1)) #t)

<lookup-in-table-tests> ::=

(test (lookup-in-table empty (make-posn 1 2)) '∞)
(test (lookup-in-table (list (make-dist-cell (make-posn 1 2) 3))
(make-posn 1 2))
3)
(test (lookup-in-table (list (make-dist-cell (make-posn 2 1) 3))
(make-posn 1 2))
'∞)

<build-bfs-table-tests> ::=

(test/set (build-bfs-table
(make-world (empty-board 3) (make-posn 1 1)
'playing 3 (make-posn 0 0) #f)
(make-posn 1 1))
(list
(make-dist-cell 'boundary 2)
(make-dist-cell (make-posn 1 0) 1)
(make-dist-cell (make-posn 2 0) 1)
(make-dist-cell (make-posn 0 1) 1)
(make-dist-cell (make-posn 1 1) 0)
(make-dist-cell (make-posn 2 1) 1)
(make-dist-cell (make-posn 1 2) 1)
(make-dist-cell (make-posn 2 2) 1)))
(test/set (build-bfs-table
(make-world
(list
(make-cell (make-posn 0 1) #t)
(make-cell (make-posn 1 0) #t)
(make-cell (make-posn 1 1) #f)
(make-cell (make-posn 1 2) #t)
(make-cell (make-posn 2 0) #t)
(make-cell (make-posn 2 1) #t)
(make-cell (make-posn 2 2) #t))
(make-posn 1 1)
'playing
3
(make-posn 0 0)
#f)
'boundary)
(list
(make-dist-cell 'boundary 0)))
(test/set (build-bfs-table
(make-world (empty-board 5)
(make-posn 2 2)
'playing
5
(make-posn 0 0)
#f)
'boundary)
(list
(make-dist-cell 'boundary 0)
(make-dist-cell (make-posn 1 0) 1)
(make-dist-cell (make-posn 2 0) 1)
(make-dist-cell (make-posn 3 0) 1)
(make-dist-cell (make-posn 4 0) 1)
(make-dist-cell (make-posn 0 1) 1)
(make-dist-cell (make-posn 1 1) 2)
(make-dist-cell (make-posn 2 1) 2)
(make-dist-cell (make-posn 3 1) 2)
(make-dist-cell (make-posn 4 1) 1)
(make-dist-cell (make-posn 0 2) 1)
(make-dist-cell (make-posn 1 2) 2)
(make-dist-cell (make-posn 2 2) 3)
(make-dist-cell (make-posn 3 2) 2)
(make-dist-cell (make-posn 4 2) 1)
(make-dist-cell (make-posn 0 3) 1)
(make-dist-cell (make-posn 1 3) 2)
(make-dist-cell (make-posn 2 3) 2)
(make-dist-cell (make-posn 3 3) 2)
(make-dist-cell (make-posn 4 3) 1)
(make-dist-cell (make-posn 1 4) 1)
(make-dist-cell (make-posn 2 4) 1)
(make-dist-cell (make-posn 3 4) 1)
(make-dist-cell (make-posn 4 4) 1)))
(test/set (build-bfs-table
(make-world (block-cell
(make-posn 4 2)
(empty-board 5))
(make-posn 2 2)
'playing
5
(make-posn 0 0)
#f)
'boundary)
(list
(make-dist-cell 'boundary 0)
(make-dist-cell (make-posn 1 0) 1)
(make-dist-cell (make-posn 2 0) 1)
(make-dist-cell (make-posn 3 0) 1)
(make-dist-cell (make-posn 4 0) 1)
(make-dist-cell (make-posn 0 1) 1)
(make-dist-cell (make-posn 1 1) 2)
(make-dist-cell (make-posn 2 1) 2)
(make-dist-cell (make-posn 3 1) 2)
(make-dist-cell (make-posn 4 1) 1)
(make-dist-cell (make-posn 0 2) 1)
(make-dist-cell (make-posn 1 2) 2)
(make-dist-cell (make-posn 2 2) 3)
(make-dist-cell (make-posn 3 2) 3)
(make-dist-cell (make-posn 0 3) 1)
(make-dist-cell (make-posn 1 3) 2)
(make-dist-cell (make-posn 2 3) 2)
(make-dist-cell (make-posn 3 3) 2)
(make-dist-cell (make-posn 4 3) 1)
(make-dist-cell (make-posn 1 4) 1)
(make-dist-cell (make-posn 2 4) 1)
(make-dist-cell (make-posn 3 4) 1)
(make-dist-cell (make-posn 4 4) 1)))
(test/set (build-bfs-table
(make-world (empty-board 5)
(make-posn 2 2)
'playing
5
(make-posn 0 0)
#f)
(make-posn 2 2))
(list
(make-dist-cell 'boundary 3)
(make-dist-cell (make-posn 1 0) 2)
(make-dist-cell (make-posn 2 0) 2)
(make-dist-cell (make-posn 3 0) 2)
(make-dist-cell (make-posn 4 0) 3)
(make-dist-cell (make-posn 0 1) 2)
(make-dist-cell (make-posn 1 1) 1)
(make-dist-cell (make-posn 2 1) 1)
(make-dist-cell (make-posn 3 1) 2)
(make-dist-cell (make-posn 4 1) 3)
(make-dist-cell (make-posn 0 2) 2)
(make-dist-cell (make-posn 1 2) 1)
(make-dist-cell (make-posn 2 2) 0)
(make-dist-cell (make-posn 3 2) 1)
(make-dist-cell (make-posn 4 2) 2)
(make-dist-cell (make-posn 0 3) 2)
(make-dist-cell (make-posn 1 3) 1)
(make-dist-cell (make-posn 2 3) 1)
(make-dist-cell (make-posn 3 3) 2)
(make-dist-cell (make-posn 4 3) 3)
(make-dist-cell (make-posn 1 4) 2)
(make-dist-cell (make-posn 2 4) 2)
(make-dist-cell (make-posn 3 4) 2)
(make-dist-cell (make-posn 4 4) 3)))
(test (lookup-in-table
(build-bfs-table (make-world (empty-board 5)
(make-posn 2 2)
'playing
5
(make-posn 0 0)
#f)
(make-posn 2 2))
(make-posn 1 4))
2)

<neighbors-tests> ::=

(test ((neighbors (empty-world 11)) (make-posn 1 1))
(adjacent (make-posn 1 1)))
(test ((neighbors (empty-world 11)) (make-posn 2 2))
(adjacent (make-posn 2 2)))
(test ((neighbors (empty-world 3)) 'boundary)
(list (make-posn 0 1)
(make-posn 1 0)
(make-posn 1 2)
(make-posn 2 0)
(make-posn 2 1)
(make-posn 2 2)))
(test ((neighbors (make-world (list
(make-cell (make-posn 0 1) #f)
(make-cell (make-posn 1 0) #f)
(make-cell (make-posn 1 1) #t)
(make-cell (make-posn 1 2) #f)
(make-cell (make-posn 2 0) #f)
(make-cell (make-posn 2 1) #f)
(make-cell (make-posn 2 2) #f))
(make-posn 1 1)
'playing
3
(make-posn 0 0)
#f))
(make-posn 1 1))
'())
(test ((neighbors (make-world (list
(make-cell (make-posn 0 1) #f)
(make-cell (make-posn 1 0) #f)
(make-cell (make-posn 1 1) #t)
(make-cell (make-posn 1 2) #f)
(make-cell (make-posn 2 0) #f)
(make-cell (make-posn 2 1) #f)
(make-cell (make-posn 2 2) #f))
(make-posn 1 1)
'playing
3
(make-posn 0 0)
#f))
(make-posn 1 0))
(list 'boundary (make-posn 2 0) (make-posn 0 1)))

<adjacent-tests> ::=

(test (adjacent (make-posn 1 1))
(list (make-posn 1 0)
(make-posn 2 0)
(make-posn 0 1)
(make-posn 2 1)
(make-posn 1 2)
(make-posn 2 2)))
(test (adjacent (make-posn 2 2))
(list (make-posn 1 1)
(make-posn 2 1)
(make-posn 1 2)
(make-posn 3 2)
(make-posn 1 3)
(make-posn 2 3)))

<on-boundary?-tests> ::=

(test (on-boundary? (make-posn 0 1) 13) #t)
(test (on-boundary? (make-posn 1 0) 13) #t)
(test (on-boundary? (make-posn 12 1) 13) #t)
(test (on-boundary? (make-posn 1 12) 13) #t)
(test (on-boundary? (make-posn 1 1) 13) #f)
(test (on-boundary? (make-posn 10 10) 13) #f)

<in-bounds?-tests> ::=

(test (in-bounds? (make-posn 0 0) 11) #f)
(test (in-bounds? (make-posn 0 1) 11) #t)
(test (in-bounds? (make-posn 1 0) 11) #t)
(test (in-bounds? (make-posn 10 10) 11) #t)
(test (in-bounds? (make-posn 0 -1) 11) #f)
(test (in-bounds? (make-posn -1 0) 11) #f)
(test (in-bounds? (make-posn 0 11) 11) #f)
(test (in-bounds? (make-posn 11 0) 11) #f)
(test (in-bounds? (make-posn 10 0) 11) #t)
(test (in-bounds? (make-posn 0 10) 11) #f)

<on-cats-path?-tests> ::=

(test ((on-cats-path? (make-world (empty-board 5)
(make-posn 1 1)
'playing
5
(make-posn 0 0)
#t))
(make-posn 1 0))
#t)
(test ((on-cats-path? (make-world (empty-board 5)
(make-posn 1 1)
'playing
5
(make-posn 0 0)
#f))
(make-posn 1 0))
#f)
(test ((on-cats-path? (make-world (empty-board 5) (make-posn 1 1)
'playing 5 (make-posn 0 0) #t))
(make-posn 2 1))
#f)
(test ((on-cats-path?
(make-world (list
(make-cell (make-posn 0 1) #t)
(make-cell (make-posn 1 0) #t)
(make-cell (make-posn 1 1) #f)
(make-cell (make-posn 1 2) #t)
(make-cell (make-posn 2 0) #t)
(make-cell (make-posn 2 1) #t)
(make-cell (make-posn 2 2) #t))
(make-posn 1 1)
'cat-lost
3
(make-posn 0 0)
#t))
(make-posn 0 1))
#f)

<+/f-tests> ::=

(test (+/f '∞ '∞) '∞)
(test (+/f '∞ 1) '∞)
(test (+/f 1 '∞) '∞)
(test (+/f 1 2) 3)

<render-world-tests> ::=

(test
(render-world
(make-world (list (make-cell (make-posn 0 1) #f))
(make-posn 0 1)
'playing
3
(make-posn 0 0)
#f))
(overlay
(render-board (list (make-cell (make-posn 0 1) #f))
3
(lambda (x) #t)
#f)
(move-pinhole thinking-cat
(- (cell-center-x (make-posn 0 1)))
(- (cell-center-y (make-posn 0 1))))))
(test
(render-world
(make-world (list (make-cell (make-posn 0 1) #f))
(make-posn 0 1)
'cat-won
3
#f
#f))
(overlay
(render-board (list (make-cell (make-posn 0 1) #f))
3
(lambda (x) #t)
#f)
(move-pinhole happy-cat
(- (cell-center-x (make-posn 0 1)))
(- (cell-center-y (make-posn 0 1))))))
(test
(render-world
(make-world (list (make-cell (make-posn 0 1) #f))
(make-posn 0 1)
'cat-lost
3
#f
#f))
(overlay
(render-board (list (make-cell (make-posn 0 1) #f))
3
(lambda (x) #t)
#f)
(move-pinhole mad-cat
(- (cell-center-x (make-posn 0 1)))
(- (cell-center-y (make-posn 0 1))))))
(test
(render-world
(make-world (list
(make-cell (make-posn 0 1) #t)
(make-cell (make-posn 1 0) #t)
(make-cell (make-posn 1 1) #f)
(make-cell (make-posn 1 2) #t)
(make-cell (make-posn 2 0) #t)
(make-cell (make-posn 2 1) #t)
(make-cell (make-posn 2 2) #t))
(make-posn 1 1)
'cat-lost
3
#f
#f))
(overlay
(render-board (list
(make-cell (make-posn 0 1) #t)
(make-cell (make-posn 1 0) #t)
(make-cell (make-posn 1 1) #f)
(make-cell (make-posn 1 2) #t)
(make-cell (make-posn 2 0) #t)
(make-cell (make-posn 2 1) #t)
(make-cell (make-posn 2 2) #t))
3
(lambda (x) #f)
#f)
(move-pinhole mad-cat
(- (cell-center-x (make-posn 1 1)))
(- (cell-center-y (make-posn 1 1))))))
(test
(render-world
(make-world (list
(make-cell (make-posn 0 1) #f)
(make-cell (make-posn 1 0) #f)
(make-cell (make-posn 1 1) #f)
(make-cell (make-posn 1 2) #f)
(make-cell (make-posn 2 0) #f)
(make-cell (make-posn 2 1) #f)
(make-cell (make-posn 2 2) #f))
(make-posn 1 1)
'cat-lost
3
(make-posn (cell-center-x (make-posn 0 1))
(cell-center-y (make-posn 0 1)))
#t))
(overlay
(render-board (list
(make-cell (make-posn 0 1) #f)
(make-cell (make-posn 1 0) #f)
(make-cell (make-posn 1 1) #f)
(make-cell (make-posn 1 2) #f)
(make-cell (make-posn 2 0) #f)
(make-cell (make-posn 2 1) #f)
(make-cell (make-posn 2 2) #f))
3
(lambda (x) #t)
(make-posn (cell-center-x (make-posn 0 1))
(cell-center-y (make-posn 0 1))))
(move-pinhole mad-cat
(- (cell-center-x (make-posn 1 1)))
(- (cell-center-y (make-posn 1 1))))))

<chop-whiskers-tests> ::=

(test (chop-whiskers (rectangle 6 6 'solid 'black))
(put-pinhole (rectangle 3 3 'solid 'black) 0 0))
(test
(pinhole-x
(render-world
(make-world
(empty-board 3)
(make-posn 0 0)
'playing
3
(make-posn 0 0)
#f)))
0)
(test
(pinhole-x
(render-world
(make-world
(empty-board 3)
(make-posn 0 1)
'playing
3
(make-posn 0 0)
#f)))
0)

<render-board-tests> ::=

(test (render-board (list (make-cell (make-posn 0 0) #f))
3
(lambda (x) #f)
#f)
(overlay
(nw:rectangle (world-width 3)
(world-height 3)
'solid
'white)
(render-cell (make-cell (make-posn 0 0) #f)
#f
#f)))
(test (render-board (list (make-cell (make-posn 0 0) #f))
3
(lambda (x) #t)
#f)
(overlay
(nw:rectangle (world-width 3)
(world-height 3)
'solid
'white)
(render-cell (make-cell (make-posn 0 0) #f)
#t
#f)))
(test (render-board (list (make-cell (make-posn 0 0) #f))
3
(lambda (x) #f)
#f)
(overlay
(nw:rectangle (world-width 3)
(world-height 3)
'solid
'white)
(render-cell (make-cell (make-posn 0 0) #f)
#f
#f)))
(test (render-board (list (make-cell (make-posn 0 0) #f)
(make-cell (make-posn 0 1) #f))
3
(lambda (x) (equal? x (make-posn 0 1)))
#f)
(overlay
(nw:rectangle (world-width 3)
(world-height 3)
'solid
'white)
(render-cell (make-cell (make-posn 0 0) #f)
#f
#f)
(render-cell (make-cell (make-posn 0 1) #f)
#t
#f)))
(test (render-board (list (make-cell (make-posn 0 0) #f)
(make-cell (make-posn 0 1) #f))
3
(lambda (x) (equal? x (make-posn 0 1)))
(make-posn 0 0))
(overlay
(nw:rectangle (world-width 3)
(world-height 3)
'solid
'white)
(render-cell (make-cell (make-posn 0 0) #f)
#f
#t)
(render-cell (make-cell (make-posn 0 1) #f)
#t
#f)))

<render-cell-tests> ::=

(test (render-cell (make-cell (make-posn 0 0) #f) #f #f)
(move-pinhole (circle circle-radius 'solid normal-color)
(- circle-radius)
(- circle-radius)))
(test (render-cell (make-cell (make-posn 0 0) #t) #f #f)
(move-pinhole (circle circle-radius 'solid 'black)
(- circle-radius)
(- circle-radius)))
(test (render-cell (make-cell (make-posn 0 0) #f) #t #f)
(move-pinhole (overlay (circle circle-radius 'solid normal-color)
(circle (quotient circle-radius 2) 'solid
on-shortest-path-color))
(- circle-radius)
(- circle-radius)))
(test (render-cell (make-cell (make-posn 0 0) #f) #t #t)
(move-pinhole (overlay (circle circle-radius 'solid normal-color)
(circle (quotient circle-radius 2) 'solid
under-mouse-color))
(- circle-radius)
(- circle-radius)))

<world-size-tests> ::=

(test (world-width 3) 150)
(test (world-height 3) 117)

<cell-center-x-tests> ::=

(test (cell-center-x (make-posn 0 0))
circle-radius)
(test (cell-center-x (make-posn 1 0))
(+ (* 2 circle-spacing) circle-radius))
(test (cell-center-x (make-posn 1 1))
(+ (* 3 circle-spacing) circle-radius))

<cell-center-y-tests> ::=

(test (cell-center-y (make-posn 1 1))
(+ circle-radius (* 2 circle-spacing 433/500)))

<clack-tests> ::=

(test (clack
(make-world '() (make-posn 0 0) 'playing 3 #f #f)
1 1 "button-down")
(make-world '() (make-posn 0 0) 'playing 3 #f #f))
(test (clack
(make-world '() (make-posn 0 0) 'playing 3 #f #f)
1 1 'drag)
(make-world '() (make-posn 0 0) 'playing 3 #f #f))
(test (clack
(make-world (list (make-cell (make-posn 0 0) #f))
(make-posn 0 1)
'playing
3
#f
#f)
(cell-center-x (make-posn 0 0))
(cell-center-y (make-posn 0 0))
'move)
(make-world
(list (make-cell (make-posn 0 0) #f))
(make-posn 0 1)
'playing
3
(make-posn 0 0)
#f))
(test (clack
(make-world (list (make-cell (make-posn 0 0) #f))
(make-posn 0 1)
'playing
3
#f
#f)
(cell-center-x (make-posn 0 0))
(cell-center-y (make-posn 0 0))
'enter)
(make-world
(list (make-cell (make-posn 0 0) #f))
(make-posn 0 1)
'playing
3
(make-posn 0 0)
#f))
(test (clack
(make-world '() (make-posn 0 0)
'playing 3 (make-posn 0 0) #f)
1 1 'leave)
(make-world '() (make-posn 0 0) 'playing 3 #f #f))
(test (clack (make-world '() (make-posn 0 0)
'playing 3 (make-posn 0 0) #f)
10
10
"button-down")
(make-world '() (make-posn 0 0) 'playing 3 #f #f))
(test (clack (make-world (list (make-cell (make-posn 0 0) #f)
(make-cell (make-posn 1 1) #f))
(make-posn 1 1)
'playing
3
(make-posn 0 0)
#f)
(cell-center-x (make-posn 0 0))
(cell-center-y (make-posn 0 0))
"button-up")
(make-world (list (make-cell (make-posn 0 0) #t)
(make-cell (make-posn 1 1) #f))
(make-posn 1 1)
'cat-lost
3
#f
#f))
(test (clack (make-world '() (make-posn 0 0)
'cat-lost 3 (make-posn 0 0) #f)
10
10
"button-up")
(make-world '() (make-posn 0 0)
'cat-lost 3 #f #f))
(test (clack
(make-world
(list (make-cell (make-posn 1 0) #f)
(make-cell (make-posn 2 0) #t)
(make-cell (make-posn 0 1) #t)
(make-cell (make-posn 1 1) #f)
(make-cell (make-posn 2 1) #t)
(make-cell (make-posn 1 2) #t)
(make-cell (make-posn 2 2) #t))
(make-posn 1 1)
'playing
3
#f
#f)
(cell-center-x (make-posn 1 0))
(cell-center-y (make-posn 1 0))
"button-up")
(make-world
(list (make-cell (make-posn 1 0) #t)
(make-cell (make-posn 2 0) #t)
(make-cell (make-posn 0 1) #t)
(make-cell (make-posn 1 1) #f)
(make-cell (make-posn 2 1) #t)
(make-cell (make-posn 1 2) #t)
(make-cell (make-posn 2 2) #t))
(make-posn 1 1)
'cat-lost
3
#f
#f))
(test (clack
(make-world
(list (make-cell (make-posn 1 0) #f)
(make-cell (make-posn 2 0) #f)
(make-cell (make-posn 0 1) #t)
(make-cell (make-posn 1 1) #f)
(make-cell (make-posn 2 1) #t)
(make-cell (make-posn 1 2) #t)
(make-cell (make-posn 2 2) #t))
(make-posn 1 1)
'playing
3
#f
#f)
(cell-center-x (make-posn 1 0))
(cell-center-y (make-posn 1 0))
"button-up")
(make-world
(list (make-cell (make-posn 1 0) #t)
(make-cell (make-posn 2 0) #f)
(make-cell (make-posn 0 1) #t)
(make-cell (make-posn 1 1) #f)
(make-cell (make-posn 2 1) #t)
(make-cell (make-posn 1 2) #t)
(make-cell (make-posn 2 2) #t))
(make-posn 2 0)
'cat-won
3
#f
#f))

<update-world-posn-tests> ::=

(test (update-world-posn
(make-world (list (make-cell (make-posn 0 0) #f))
(make-posn 0 1) 'playing 3 #f #f)
(make-posn (cell-center-x (make-posn 0 0))
(cell-center-y (make-posn 0 0))))
(make-world (list (make-cell (make-posn 0 0) #f))
(make-posn 0 1) 'playing 3 (make-posn 0 0) #f))
(test (update-world-posn
(make-world (list (make-cell (make-posn 0 0) #f))
(make-posn 0 0) 'playing 3 #f #f)
(make-posn (cell-center-x (make-posn 0 0))
(cell-center-y (make-posn 0 0))))
(make-world (list (make-cell (make-posn 0 0) #f))
(make-posn 0 0) 'playing 3 #f #f))
(test (update-world-posn
(make-world (list (make-cell (make-posn 0 0) #f))
(make-posn 0 1) 'playing 3 (make-posn 0 0) #f)
(make-posn 0 0))
(make-world (list (make-cell (make-posn 0 0) #f))
(make-posn 0 1) 'playing 3 #f #f))

<move-cat-tests> ::=

(test
(move-cat
(make-world (list (make-cell (make-posn 1 0) #f)
(make-cell (make-posn 2 0) #f)
(make-cell (make-posn 3 0) #f)
(make-cell (make-posn 4 0) #f)
(make-cell (make-posn 0 1) #f)
(make-cell (make-posn 1 1) #t)
(make-cell (make-posn 2 1) #t)
(make-cell (make-posn 3 1) #f)
(make-cell (make-posn 4 1) #f)
(make-cell (make-posn 0 2) #f)
(make-cell (make-posn 1 2) #t)
(make-cell (make-posn 2 2) #f)
(make-cell (make-posn 3 2) #t)
(make-cell (make-posn 4 2) #f)
(make-cell (make-posn 0 3) #f)
(make-cell (make-posn 1 3) #t)
(make-cell (make-posn 2 3) #f)
(make-cell (make-posn 3 3) #f)
(make-cell (make-posn 4 3) #f)
(make-cell (make-posn 1 4) #f)
(make-cell (make-posn 2 4) #f)
(make-cell (make-posn 3 4) #f)
(make-cell (make-posn 4 4) #f))
(make-posn 2 2)
'playing
5
(make-posn 0 0)
#f))
(make-world (list (make-cell (make-posn 1 0) #f)
(make-cell (make-posn 2 0) #f)
(make-cell (make-posn 3 0) #f)
(make-cell (make-posn 4 0) #f)
(make-cell (make-posn 0 1) #f)
(make-cell (make-posn 1 1) #t)
(make-cell (make-posn 2 1) #t)
(make-cell (make-posn 3 1) #f)
(make-cell (make-posn 4 1) #f)
(make-cell (make-posn 0 2) #f)
(make-cell (make-posn 1 2) #t)
(make-cell (make-posn 2 2) #f)
(make-cell (make-posn 3 2) #t)
(make-cell (make-posn 4 2) #f)
(make-cell (make-posn 0 3) #f)
(make-cell (make-posn 1 3) #t)
(make-cell (make-posn 2 3) #f)
(make-cell (make-posn 3 3) #f)
(make-cell (make-posn 4 3) #f)
(make-cell (make-posn 1 4) #f)
(make-cell (make-posn 2 4) #f)
(make-cell (make-posn 3 4) #f)
(make-cell (make-posn 4 4) #f))
(make-posn 2 3)
'playing
5
(make-posn 0 0)
#f))

<change-tests> ::=

(test (change (make-world '() (make-posn 1 1)
'playing 3 (make-posn 0 0) #f)
"h")
(make-world '() (make-posn 1 1)
'playing 3 (make-posn 0 0) #t))
(test (change (make-world '() (make-posn 1 1)
'playing 3 (make-posn 0 0) #t)
"release")
(make-world '() (make-posn 1 1) 'playing 3 (make-posn 0 0) #f))

<point-in-this-circle?-tests> ::=

(test (point-in-this-circle? (make-posn 0 0)
(cell-center-x (make-posn 0 0))
(cell-center-y (make-posn 0 0)))
#t)
(test (point-in-this-circle? (make-posn 0 0) 0 0)
#f)

<find-best-positions-tests> ::=

(test (find-best-positions (list (make-posn 0 0)) (list 1))
(list (make-posn 0 0)))
(test (find-best-positions (list (make-posn 0 0)) (list '∞))
#f)
(test (find-best-positions (list (make-posn 0 0)
(make-posn 1 1))
(list 1 2))
(list (make-posn 0 0)))
(test (find-best-positions (list (make-posn 0 0)
(make-posn 1 1))
(list 1 1))
(list (make-posn 0 0)
(make-posn 1 1)))
(test (find-best-positions (list (make-posn 0 0)
(make-posn 1 1))
(list '∞ 2))
(list (make-posn 1 1)))
(test (find-best-positions (list (make-posn 0 0)
(make-posn 1 1))
(list '∞ '∞))
#f)

<lt/f-tests> ::=

(test (<=/f 1 2) #t)
(test (<=/f 2 1) #f)
(test (<=/f '∞ 1) #f)
(test (<=/f 1 '∞) #t)
(test (<=/f '∞ '∞) #t)

<circle-at-point-tests> ::=

(test (circle-at-point empty 0 0) #f)
(test (circle-at-point (list (make-cell (make-posn 0 0) #f))
(cell-center-x (make-posn 0 0))
(cell-center-y (make-posn 0 0)))
(make-posn 0 0))
(test (circle-at-point (list (make-cell (make-posn 0 0) #f)
(make-cell (make-posn 0 1) #f))
(cell-center-x (make-posn 0 1))
(cell-center-y (make-posn 0 1)))
(make-posn 0 1))
(test (circle-at-point (list (make-cell (make-posn 0 0) #f))
0 0)
#f)

<blocked-cells-tests> ::=

(test (block-cell (make-posn 1 1)
(list (make-cell (make-posn 0 0) #f)
(make-cell (make-posn 1 1) #f)
(make-cell (make-posn 2 2) #f)))
(list (make-cell (make-posn 0 0) #f)
(make-cell (make-posn 1 1) #t)
(make-cell (make-posn 2 2) #f)))
(test (add-n-random-blocked-cells 0 (list (make-cell (make-posn 0 0)
#t))
3)
(list (make-cell (make-posn 0 0) #t)))
(test (add-n-random-blocked-cells 1 (list (make-cell (make-posn 0 0)
#f))
3)
(list (make-cell (make-posn 0 0) #t)))

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