games: the natural the deal test didn't expect

TestDealTakesTheStakeAndHidesTheHoleCard checked for a 900 stack straight
after a 100 bet, and only afterwards looked at whether the hand had already
settled. A dealt natural settles inside the deal, so the stake is back (with
the win, or as a push) before the test looks, and it failed whenever the shoe
handed out a blackjack. It now checks for a settled natural first and, if it
finds one, only asks that the stack didn't lose more than the bet.

internal/web/games_play_test.go

@@ -93,9 +93,6 @@ func TestDealTakesTheStakeAndHidesTheHoleCard(t *testing.T) {
 	if code != 200 {
 		t.Fatalf("deal = %d, want 200", code)
 	}
-	if v.Chips != 900 {
-		t.Fatalf("chips after a 100 bet = %d, want 900", v.Chips)
-	}
 	if v.Hand == nil {
 		t.Fatal("deal returned no hand")
 	}
@@ -103,10 +100,18 @@ func TestDealTakesTheStakeAndHidesTheHoleCard(t *testing.T) {
 		t.Fatalf("player was dealt %d cards, want 2", len(v.Hand.Hands[0].Cards))
 	}
 
-	// A natural settles on the spot and legitimately shows both dealer cards.
+	// A natural settles on the spot: the stake has already come back (with the
+	// win, or as a push), and both dealer cards are legitimately shown. Checking
+	// the stack for 900 before this made the test fail on every dealt natural.
 	if v.Hand.Phase == "done" {
+		if v.Chips < 900 {
+			t.Fatalf("chips after a settled natural = %d, want at least the 900 left after the bet", v.Chips)
+		}
 		return
 	}
+	if v.Chips != 900 {
+		t.Fatalf("chips after a 100 bet = %d, want 900", v.Chips)
+	}
 	if !v.Hand.Hole || len(v.Hand.Dealer) != 1 {
 		t.Fatalf("dealer shows %d cards (hole=%v), want 1 with the hole card held back",
 			len(v.Hand.Dealer), v.Hand.Hole)