feat: casino framework and basic slot machine

1 files changed, 44 insertions, 0 deletions

diff --git a/internal/casino/slots_test.go b/internal/casino/slots_test.go
new file mode 100644
index 0000000..22e39bf
--- /dev/null
+++ b/internal/casino/slots_test.go
@@ -0,0 +1,44 @@
+package casino
+
+import "testing"
+
+func TestCalculateRTPUsesLongestWayOnly(t *testing.T) {
+	profile := SlotProfile{
+		Rows: 3, Reels: 5, Ways: 243,
+		Symbols:         []SlotSymbol{{ID: "x", Weight: 1, Payout: map[int]float64{3: 1, 4: 2, 5: 3}}},
+		FreeSpinTrigger: "scatter", FreeSpinCount: 8,
+	}
+	if got := CalculateRTP(profile); got != 3 {
+		t.Fatalf("RTP = %v, want 3", got)
+	}
+}
+
+func TestValidateRTP(t *testing.T) {
+	profile := SlotProfile{Rows: 3, Reels: 5, Ways: 243, TargetRTP: 3,
+		Symbols: []SlotSymbol{{ID: "x", Weight: 1, Payout: map[int]float64{5: 3}}}}
+	if err := ValidateRTP(profile, 0.000001); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestScaleToRTP(t *testing.T) {
+	profile := ScaleToRTP(DefaultHuffAndPuffProfile(), 0.97)
+	if err := ValidateRTP(profile, 0.000000001); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestEvaluateSlotReportsWinningWays(t *testing.T) {
+	profile := SlotProfile{Rows: 3, Reels: 5, Ways: 243,
+		Symbols: []SlotSymbol{{ID: "x", Weight: 1, Payout: map[int]float64{5: 2}}}}
+	grid := [3][5]string{}
+	for row := range grid {
+		for reel := range grid[row] {
+			grid[row][reel] = "x"
+		}
+	}
+	payout, wins := evaluateSlot(grid, 10, profile)
+	if payout != 20 || len(wins) != 1 || wins[0].Ways != 243 || wins[0].Length != 5 {
+		t.Fatalf("payout=%v wins=%+v", payout, wins)
+	}
+}