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Add create_bitmap unit test #138

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Add create_bitmap unit test #138

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83cf2e6
Add create_bitmap unit test
rory-cd Nov 17, 2025
0ddbb71
Add free_bitmap call to avoid memory issues
rory-cd Nov 27, 2025
eb76dff
Merge remote-tracking branch 'upstream/main' into test/create_bitmap
rory-cd Nov 30, 2025
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49 changes: 47 additions & 2 deletions coresdk/src/test/unit_tests/unit_test_bitmap.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -16,9 +16,9 @@ constexpr int ROCKET_WIDTH = 36, ROCKET_HEIGHT = 72,
BACKGROUND_WIDTH = 864, BACKGROUND_HEIGHT = 769,
FROG_WIDTH = 294, FROG_HEIGHT = 422;

TEST_CASE("bitmaps can be created and freed", "[load_bitmap][bitmap_width][bitmap_height][free_bitmap]")
TEST_CASE("bitmaps can be loaded and freed", "[load_bitmap][bitmap_width][bitmap_height][free_bitmap]")
{
// Creating bitmaps
// Loading bitmaps
bitmap rocket_bmp, frog_bmp, background_bmp;
rocket_bmp = load_bitmap("rocket_sprt", "rocket_sprt.png");
REQUIRE(bitmap_valid(rocket_bmp));
Expand Down Expand Up @@ -134,3 +134,48 @@ TEST_CASE("bitmap bounding details can be retrieved", "[bitmap]")
}
free_bitmap(bmp);
}

TEST_CASE("can create and free a new bitmap", "[create_bitmap]")
{
// Initialise
int width = 256;
int height = 128;
bitmap bmp = create_bitmap("new_bitmap", width, height);

// Ensure bitmap exists and is valid
REQUIRE(bmp != nullptr);
REQUIRE(bitmap_valid(bmp));
REQUIRE(has_bitmap("new_bitmap"));

SECTION("bitmap has correct dimensions")
{
REQUIRE(bitmap_width(bmp) == width);
REQUIRE(bitmap_height(bmp) == height);
}

SECTION("bitmap is transparent")
{
// Sample pixel colours
color p1 = get_pixel(bmp, 0, 0);
color p2 = get_pixel(bmp, width - 1, height - 1);
color p3 = get_pixel(bmp, width / 2, height / 2);

// Check transparency (alpha == 0)
REQUIRE(p1.a == 0);
REQUIRE(p2.a == 0);
REQUIRE(p3.a == 0);
}

SECTION("bitmap can be drawn on")
{
// Try to draw a single white pixel
REQUIRE_NOTHROW(draw_pixel_on_bitmap(bmp, color_white(), 0, 0));
}

SECTION("bitmap can be freed")
{
free_bitmap(bmp);
REQUIRE_FALSE(bitmap_valid(bmp));
}
free_bitmap(bmp);
}