diff --git a/CMakeLists.txt b/CMakeLists.txt
index 240c095..dbf8e81 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,6 +43,7 @@ add_test(test_thperrier_game_equal ./game_test_thperrier game_equal)
 add_test(test_thperrier_game_delete ./game_test_thperrier game_delete)
 add_test(test_thperrier_game_is_blank ./game_test_thperrier game_is_blank)
 add_test(test_thperrier_game_is_lightbulb ./game_test_thperrier game_is_lightbulb)
+add_test(test_thperrier_game_is_black ./game_test_thperrier game_is_black)
 
 add_test(test_nnunes_dummy ./game_test_thperrier dummy)
 add_test(test_nnunes_game_get_square ./game_test_nnunes game_get_square)
diff --git a/README.md b/README.md
index acd681f..0bf3e60 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ Projet Techno
 | [game_get_flags](./game_test_nnunes.c#L?)           | [square game_get_flags(cgame g, uint i, uint j)](./game.h#L155-166)          | @nnunes     |                                         | <ul><li>[X] </li></ul> |
 | [game_is_blank](./game_test_thperrier.c#L?)         | [bool game_is_blank(cgame g, uint i, uint j)](./game.h#L168-178)             | @thperrier  |                                         | <ul><li>[x] </li></ul> |
 | [game_is_lightbulb](./game_test_thperrier.c#L?)     | [bool game_is_lightbulb(cgame g, uint i, uint j)](./game.h#L180-190)         | @thperrier  |                                         | <ul><li>[x] </li></ul> |
-| [game_is_black](./game_test_thperrier.c#L?)         | [bool game_is_black(cgame g, uint i, uint j)](./game.h#L192-202)             | @thperrier  |                                         | <ul><li>[ ] </li></ul> |
+| [game_is_black](./game_test_thperrier.c#L?)         | [bool game_is_black(cgame g, uint i, uint j)](./game.h#L192-202)             | @thperrier  |                                         | <ul><li>[x] </li></ul> |
 | [game_get_black_number](./game_test_thperrier.c#L?) | [int game_get_black_number(cgame g, uint i, uint j)](./game.h#L204-214)      | @thperrier  |                                         | <ul><li>[ ] </li></ul> |
 | [game_is_marked](./game_test_nnunes.c#L?)           | [bool game_is_marked(cgame g, uint i, uint j)](./game.h#L216-226)            | @nnunes     |                                         | <ul><li>[X] </li></ul> |
 | [game_is_lighted](./game_test_nnunes.c#L?)          | [bool game_is_lighted(cgame g, uint i, uint j)](./game.h#L228-238)           | @nnunes     |                                         | <ul><li>[X] </li></ul> |
diff --git a/game_test_thperrier.c b/game_test_thperrier.c
index d2b35cf..7000739 100644
--- a/game_test_thperrier.c
+++ b/game_test_thperrier.c
@@ -12,6 +12,43 @@ bool test_dummy(){
     return true;
 }
 
+/* ********** game_is_black ********** */
+bool test_game_is_black(){
+    game g = game_new_empty();
+    game_set_square(g, 0, 0, S_BLACKU);
+    if (!(game_get_square(g, 0, 0) == S_BLACKU) && game_is_black(g, 0, 0)){
+        game_delete(g);
+        return false;
+    }
+    game_set_square(g, 0, 0, S_BLACK0);
+    if (!(game_get_square(g, 0, 0) == S_BLACK0) && game_is_black(g, 0, 0)){
+        game_delete(g);
+        return false;
+    }
+    game_set_square(g, 0, 0, S_BLACK1);
+    if (!(game_get_square(g, 0, 0) == S_BLACK1) && game_is_black(g, 0, 0)){
+        game_delete(g);
+        return false;
+    }
+    game_set_square(g, 0, 0, S_BLACK2);
+    if (!(game_get_square(g, 0, 0) == S_BLACK2) && game_is_black(g, 0, 0)){
+        game_delete(g);
+        return false;
+    }
+    game_set_square(g, 0, 0, S_BLACK3);
+    if (!(game_get_square(g, 0, 0) == S_BLACK3) && game_is_black(g, 0, 0)){
+        game_delete(g);
+        return false;
+    }
+    game_set_square(g, 0, 0, S_BLACK4);
+    if (!(game_get_square(g, 0, 0) == S_BLACK4) && game_is_black(g, 0, 0)){
+        game_delete(g);
+        return false;
+    }
+    game_delete(g);
+    return true;
+}
+
 /* ********** game_is_blank ********** */
 bool test_game_is_lightbulb(){
     game g = game_new_empty();
@@ -43,6 +80,7 @@ bool test_game_delete(){
     if (game_equal(g1, g2)){
         return false;
     }
+    g1 = NULL;
     return true;
 }