add: new tictactoe game

add: testing to tictactoe

rename: tictactoe

add: tictactoe steps

refactor: tictactoe const names

refactor: tictactoe loop

add: tictactoe bad switch example (fallthrough)

refactor: tictactoe loop skin

remove: tictactoe changable skin

refactor: tictactoe all

remove: tictactoe unnecessary base dir

add: tictactoe slices

add: tictactoe slices

remove: tictactoe fallthrough

rename: tictactoe slices 10 -> 09

update: loops skin tictactoe

add: tictactoe randomization

add: tictactoe infinite loop and labeled break

refactor: tictactoe rand and infinite loop

add: tictactoe buggy winning algo

add: tictactoe more tests

rename: tictactoe wrongPlay to wrongMove

add: tictactoe even more tests

fix: tictactoe

rename: tictactoe waitForInput to wait

add: tictactoe os.args gameSpeed

remove: tictactoe unnecessary files

rename: tictactoe game messages

refactor: tictactoe main loop

add: types and arrays

x-tba/tictactoe/14-more-tests/play_test.go

@@ -0,0 +1,26 @@
+package main
+
+import "testing"
+
+func TestWrongMove(t *testing.T) {
+	// /---+---+---\
+	// | X | X | X |
+	// +---+---+---+
+	// | X | X | X |
+	// +---+---+---+
+	// | X | X | X |
+	// \---+---+---/
+
+	// fill the board with artificial cells
+	for i := range cells {
+		cells[i] = player1
+	}
+
+	// any move beyond this point is wrong.
+	// reason: every cell is occupied.
+	if play(); !wrongMove {
+		t.Errorf("wrongMove = %t; want true", wrongMove)
+	}
+
+	initCells()
+}