放大图形验证码文字

backend/tests/test_captcha.py

@@ -1,4 +1,16 @@
-from app.services.captcha import make_captcha, verify_captcha
+import base64
+import io
+
+from PIL import Image
+
+from app.services.captcha import (
+    CAPTCHA_FONT_SIZE,
+    CAPTCHA_HEIGHT,
+    CAPTCHA_WIDTH,
+    load_captcha_font,
+    make_captcha,
+    verify_captcha,
+)
 
 
 def test_captcha_can_only_be_used_once():
@@ -7,3 +19,12 @@ def test_captcha_can_only_be_used_once():
     # The real code is intentionally not exposed. This test locks in one-time consumption behavior.
     assert not verify_captcha(captcha_id, "bad")
     assert not verify_captcha(captcha_id, "bad")
+
+
+def test_captcha_uses_large_font_and_expected_image_size():
+    captcha = make_captcha()
+    encoded_image = captcha["image"].split(",", 1)[1]
+    image = Image.open(io.BytesIO(base64.b64decode(encoded_image)))
+
+    assert image.size == (CAPTCHA_WIDTH, CAPTCHA_HEIGHT)
+    assert getattr(load_captcha_font(), "size", CAPTCHA_FONT_SIZE) == CAPTCHA_FONT_SIZE