test(vector): add demo vector graphic test (#9130)

Signed-off-by: pengyiqiang <pengyiqiang@xiaomi.com>
Co-authored-by: pengyiqiang <pengyiqiang@xiaomi.com>

tests/src/test_cases/test_demo_vector_graphic.c

@@ -0,0 +1,35 @@
+#if LV_BUILD_TEST
+#include "../lvgl.h"
+
+#include "unity/unity.h"
+#include "../demos/lv_demos.h"
+
+#ifndef NON_AMD64_BUILD
+    #define EXT_NAME ".lp64.png"
+#else
+    #define EXT_NAME ".lp32.png"
+#endif
+
+void setUp(void)
+{
+    /* Function run before every test */
+}
+
+void tearDown(void)
+{
+    /* Function run after every test */
+    lv_obj_clean(lv_screen_active());
+}
+
+void test_demo_vector_graphic(void)
+{
+    lv_demo_vector_graphic_buffered();
+    TEST_ASSERT_EQUAL_SCREENSHOT("demo_vector_graphic_buffered" EXT_NAME);
+
+    lv_obj_clean(lv_screen_active());
+
+    lv_demo_vector_graphic_not_buffered();
+    TEST_ASSERT_EQUAL_SCREENSHOT("demo_vector_graphic_not_buffered" EXT_NAME);
+}
+
+#endif