[state-of-tic-tac-toe] sync tests (#3160)

Closes #3159

Author: IsaacG

exercises/practice/state-of-tic-tac-toe/.meta/example.go

@@ -48,6 +48,13 @@ func StateOfTicTacToe(board []string) (State, error) {
 		}
 	}
 
+	if xWin > 0 && xCount == oCount {
+		return "", errors.New("impossible board: game should have ended after the game was won")
+	}
+	if oWin > 0 && xCount != oCount {
+		return "", errors.New("impossible board: game should have ended after the game was won")
+	}
+
 	if xWin > 0 || oWin > 0 {
 		return Win, nil
 	}

exercises/practice/state-of-tic-tac-toe/.meta/tests.toml

@@ -99,3 +99,9 @@ reimplements = "b1dc8b13-46c4-47db-a96d-aa90eedc4e8d"
 
 [4801cda2-f5b7-4c36-8317-3cdd167ac22c]
 description = "Invalid boards -> Invalid board: players kept playing after a win"
+
+[5a84757a-fc86-4328-aec9-a5759e6ed35d]
+description = "Invalid boards -> Invalid board: O kept playing after X wins"
+
+[cf25543d-583a-4656-b9ab-f82dc00a4a02]
+description = "Invalid boards -> Invalid board: X kept playing after O wins"

exercises/practice/state-of-tic-tac-toe/cases_test.go

@@ -3,7 +3,7 @@ package stateoftictactoe
 // This is an auto-generated file. Do not change it manually. Run the generator to update the file.
 // See https://github.com/exercism/go#synchronizing-tests-and-instructions
 // Source: exercism/problem-specifications
-// Commit: 25c2ae5 build(deps): bump fast-uri from 3.1.0 to 3.1.2 (#2653)
+// Commit: 0682194 state-of-tic-tac-toe: Add test cases for playing after a win (#2667)
 
 type testCase struct {
 	description string
@@ -175,4 +175,16 @@ var testCases = []testCase{
 		expected:    "",
 		wantErr:     true,
 	},
+	{
+		description: "Invalid board: O kept playing after X wins",
+		board:       []string{"OO ", "XXX", " O "},
+		expected:    "",
+		wantErr:     true,
+	},
+	{
+		description: "Invalid board: X kept playing after O wins",
+		board:       []string{"XX ", "OOO", " XX"},
+		expected:    "",
+		wantErr:     true,
+	},
 }

exercises/practice/state-of-tic-tac-toe/state_of_tic_tac_toe_test.go

@@ -10,7 +10,7 @@ func TestStateOfTicTacToe(t *testing.T) {
 			result, err := StateOfTicTacToe(c.board)
 			switch {
 			case c.wantErr && err == nil:
-				t.Fatalf("\n Board: %#v \n Expected error but got nil", c.board)
+				t.Fatalf("\n Board: %#v \n Expected error but got %v, nil", c.board, result)
 
 			case !c.wantErr && err != nil:
 				t.Fatalf("\n Board: %#v \n Expected no errors but got error: %q", c.board, err)