Test-Driven Development in Java/

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Managing Game Start Errors in Wordz

Managing Game Start Errors in Wordz

Handle errors during game initiation in the Wordz application to prevent game restarts when a session is already active by returning a clear HTTP status code to client requests.

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Handling errors when starting a game

One of our design decisions is that a player cannot start a game when one is in progress. We need to test-drive this behavior. We choose to return an HTTP status of 409 Conflict to indicate that a game is already in progress for a player and a new one cannot be started for them.

  • We write the test to return a 409 Conflict if the game is already in progress:

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@Test
void rejectsRestart() throws Exception {
    when(mockWordz.newGame(eq(player))).thenReturn(false);
    var req = requestBuilder("start").POST(asJsonBody(player)).build();
    var res = httpClient.send(req, HttpResponse.BodyHandlers.discarding());
    assertThat(res).hasStatusCode(HttpStatus.CONFLICT.code);
}
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