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generator_test.go
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generator_test.go
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package sudoku
import "testing"
func TestSeedSolution(t *testing.T) {
var puz Puzzle
ch := make(chan int)
n := 1
go puz.SeedSolution(n, ch)
result := <-ch
if result != n {
t.Errorf("incorrect count from SeedSolution(): expected %v cells populated, got %v", n, result)
}
err := puz.Validate()
if err != nil {
t.Errorf("invalid result from SeedSolution(): %v\n\n%v", err, puz.String())
}
puz.Clear()
n = 27
go puz.SeedSolution(n, ch)
result = <-ch
if result > n || result < 1 {
t.Errorf("unexpected count from SeedSolution(): expected at least 1 and up to %v cells populated, got %v", n, result)
}
// Attempt to seed a complete puzzle
puz = Puzzle{
'2', '9', '7', '6', '3', '5', '8', '1', '4',
'6', '5', '1', '4', '2', '8', '7', '9', '3',
'4', '8', '3', '1', '9', '7', '5', '2', '6',
'7', '4', '8', '5', '1', '9', '6', '3', '2',
'9', '6', '5', '2', '7', '3', '1', '4', '8',
'1', '3', '2', '8', '4', '6', '9', '7', '5',
'5', '1', '9', '3', '6', '2', '4', '8', '7',
'3', '7', '6', '9', '8', '4', '2', '5', '1',
'8', '2', '4', '7', '5', '1', '3', '6', '9'}
go puz.SeedSolution(n, ch)
result = <-ch
if result != 0 {
t.Errorf("unexpected count from SeedSolution(): expected 0, got %v", result)
}
// Attempt to seed a puzzle containing a contradiction
puz = Puzzle{
'2', '9', '7', '6', '3', '5', '8', '1', '4',
'6', '5', '1', '4', '2', '8', '7', '9', '3',
'4', '8', '3', '1', '9', '7', '5', '2', '6',
'7', '4', '8', '5', '1', '9', '6', '3', '2',
'9', '6', '5', '2', ' ', '3', '1', '7', '8',
'1', '3', '2', '8', '4', '6', '9', '4', '5',
'5', '1', '9', '3', '6', '2', '4', '8', '7',
'3', '7', '6', '9', '8', '4', '2', '5', '1',
'8', '2', '4', '7', '5', '1', '3', '6', '9'}
go puz.SeedSolution(n, ch)
result = <-ch
if result != 0 {
t.Errorf("unexpected count from SeedSolution(): expected 0, got %v", result)
}
if Known(puz[40]) {
t.Errorf("unexpected value in R5C5 from SeedSolution(): expected unknown, got %q", puz[40])
}
}
func TestAttemptSolution(t *testing.T) {
ch := make(chan bool)
// “Easy” difficulty
puz := Puzzle{
'2', ' ', ' ', '6', '3', ' ', ' ', '1', ' ',
' ', '5', '1', ' ', '2', ' ', '7', '9', '3',
'4', ' ', '3', '1', '9', '7', '5', ' ', ' ',
' ', ' ', ' ', ' ', ' ', '9', ' ', '3', '2',
' ', '6', '5', ' ', '7', ' ', '1', '4', ' ',
'1', '3', ' ', '8', ' ', ' ', ' ', ' ', ' ',
' ', ' ', '9', '3', '6', '2', '4', ' ', '7',
'3', '7', '6', ' ', '8', ' ', '2', '5', ' ',
' ', '2', ' ', ' ', '5', '1', ' ', ' ', '9'}
expect := Puzzle{
'2', '9', '7', '6', '3', '5', '8', '1', '4',
'6', '5', '1', '4', '2', '8', '7', '9', '3',
'4', '8', '3', '1', '9', '7', '5', '2', '6',
'7', '4', '8', '5', '1', '9', '6', '3', '2',
'9', '6', '5', '2', '7', '3', '1', '4', '8',
'1', '3', '2', '8', '4', '6', '9', '7', '5',
'5', '1', '9', '3', '6', '2', '4', '8', '7',
'3', '7', '6', '9', '8', '4', '2', '5', '1',
'8', '2', '4', '7', '5', '1', '3', '6', '9'}
go puz.AttemptSolution(ch)
if !<-ch {
t.Errorf("AttemptSolution indicated failure:\n\n%v", puz.String())
}
if !puz.Equal(expect) {
t.Errorf("unexpected result from AttemptSolution: expected:\n%v\n\ngot:\n%v", expect.String(), puz.String())
}
// “Tricky” difficulty
puz = Puzzle{
' ', ' ', '3', ' ', '5', ' ', '2', ' ', ' ',
'2', ' ', ' ', '7', ' ', '6', ' ', ' ', '9',
'7', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '4',
' ', '2', ' ', '8', ' ', '1', ' ', '6', ' ',
' ', ' ', '9', '6', ' ', '2', '4', ' ', ' ',
' ', '4', ' ', '3', ' ', '5', ' ', '2', ' ',
'4', ' ', ' ', ' ', ' ', ' ', ' ', ' ', '8',
'3', ' ', ' ', '4', ' ', '8', ' ', ' ', '2',
' ', ' ', '5', ' ', '1', ' ', '3', ' ', ' '}
go puz.AttemptSolution(ch)
if !<-ch {
t.Errorf("AttemptSolution indicated failure:\n\n%v", puz.String())
}
remain := puz.NumUnknowns()
if remain != 0 {
t.Errorf("too many unknowns after AttemptSolution: expected %v unknowns remaining, got %v", 0, remain)
}
err := puz.Validate()
if err != nil {
t.Errorf("invalid puzzle from AttemptSolution: %v\n\n%v", err, puz.String())
}
// “Extreme” difficulty
puz = Puzzle{
' ', ' ', '8', ' ', ' ', '6', '2', '5', ' ',
' ', ' ', ' ', ' ', '7', ' ', ' ', '3', ' ',
' ', ' ', ' ', ' ', '1', '2', '9', '8', ' ',
' ', ' ', '5', ' ', ' ', '3', ' ', ' ', ' ',
' ', '2', ' ', '7', ' ', '1', ' ', '6', ' ',
' ', ' ', ' ', '8', ' ', ' ', '1', ' ', ' ',
' ', '3', '6', '2', '8', ' ', ' ', ' ', ' ',
' ', '7', ' ', ' ', '9', ' ', ' ', ' ', ' ',
' ', '8', '2', '1', ' ', ' ', '4', ' ', ' '}
go puz.AttemptSolution(ch)
if !<-ch {
t.Errorf("AttemptSolution indicated failure:\n\n%v", puz.String())
}
remain = puz.NumUnknowns()
if remain != 0 {
t.Errorf("too many unknowns after AttemptSolution: expected %v unknowns remaining, got %v", 0, remain)
}
err = puz.Validate()
if err != nil {
t.Errorf("invalid puzzle from AttemptSolution: %v\n\n%v", err, puz.String())
}
}
func TestGenerateSolution(t *testing.T) {
puz := GenerateSolution()
unknowns := puz.NumUnknowns()
if unknowns != 0 {
t.Errorf("incorrect result from GenerateSolution(): expected zero unknowns, got %v:\n\n%v", unknowns, puz.String())
}
err := puz.Validate()
if err != nil {
t.Errorf("invalid result from GenerateSolution(): %v\n\n%v", err, puz.String())
}
}
func TestMinimalMask(t *testing.T) {
sol := Puzzle{
'2', '9', '7', '6', '3', '5', '8', '1', '4',
'6', '5', '1', '4', '2', '8', '7', '9', '3',
'4', '8', '3', '1', '9', '7', '5', '2', '6',
'7', '4', '8', '5', '1', '9', '6', '3', '2',
'9', '6', '5', '2', '7', '3', '1', '4', '8',
'1', '3', '2', '8', '4', '6', '9', '7', '5',
'5', '1', '9', '3', '6', '2', '4', '8', '7',
'3', '7', '6', '9', '8', '4', '2', '5', '1',
'8', '2', '4', '7', '5', '1', '3', '6', '9'}
mask := sol.MinimalMask()
count := mask.Count(true)
if count < MIN_CLUES || count > (Size*Size) - 4 {
t.Errorf("incorrect result from MinimalMask: got %v clues:\n%v", count, mask.String())
}
}