Mercurial > hg > terminal-chess / file diff

--- a/test/test-fen.c	Sat Sep 05 12:36:04 2026 +0200
+++ b/test/test-fen.c	Sat Sep 05 13:03:09 2026 +0200
@@ -97,7 +97,7 @@
 }
 
 static CX_TEST(test_fen_with_castling_rights) {
-    /* a test that simply checks if an arbitrary FEN is parsed correctly */
+    /* this test contains castling rights and a non-zero fifty-moves counter */
     const char * fen = "1rbqk1nr/ppp2ppp/2np4/2b1p3/2P5/2N1P1P1/PP1P1PBP/R1BQK1NR w KQk - 1 6";
     Board expected_board = {
         {WROOK, 0,       WBISHOP, WQUEEN, WKING, 0,       WKNIGHT, WROOK},
@@ -162,12 +162,42 @@
     gamestate_cleanup(&gs);
 }
 
+static CX_TEST(test_fen_checkmate) {
+    /* this test contains a full game where white is checkmated */
+    const char * fen = "5rk1/1pp4p/p1n3p1/4b1N1/8/1P1N4/P1P3P1/qKB4R w - - 2 26";
+    GameState gs;
+    int result = fen_parse(fen, &gs);
+    CX_TEST_DO {
+        CX_TEST_ASSERT(result == 0);
+        CX_TEST_ASSERT(strcmp(gs.fen_start, fen) == 0);
+        CX_TEST_ASSERT(gs.fifty_cntr_start == 2);
+        CX_TEST_ASSERT(gs.move_start == 50);
+        CX_TEST_ASSERT(current_color(&gs) == WHITE);
+        CX_TEST_ASSERT(!gs.stalemate);
+        CX_TEST_ASSERT(!gs.threefold);
+        CX_TEST_ASSERT(!gs.nomaterial);
+        CX_TEST_ASSERT(!gs.remis);
+        CX_TEST_ASSERT(!gs.wresign);
+        CX_TEST_ASSERT(!gs.bresign);
+        CX_TEST_ASSERT(!gs.ragequit);
+        CX_TEST_ASSERT(!gs.review);
+        /* the checkmate flag must be set */
+        CX_TEST_ASSERT(gs.checkmate);
+        /* check that we get the original FEN back */
+        char fen_chk[FEN_MAX_LENGTH];
+        fen_compute(fen_chk, &gs);
+        CX_TEST_ASSERTM(strcmp(fen, fen_chk) == 0, fen_chk);
+    }
+    gamestate_cleanup(&gs);
+}
+
 CxTestSuite* test_fen_suite(void) {
     CxTestSuite* suite = cx_test_suite_new("Test FEN API");
 
     cx_test_register(suite, test_fen_basic);
     cx_test_register(suite, test_fen_with_castling_rights);
-    // TODO: test FENs that describe definitely ended games (for each type of ending)
+    cx_test_register(suite, test_fen_checkmate);
+    // TODO: test FENs that describe stalemate, threefold, no-material positions
     // TODO: test FEN with en-passant threat
 
     return suite;