diff --git a/tests/core/frame_test.py b/tests/core/frame_test.py
index 2e1d5fd..67d9e7c 100644
--- a/tests/core/frame_test.py
+++ b/tests/core/frame_test.py
@@ -361,6 +361,9 @@ def test_frame_asserts() -> None:
   assert frm.center == (gmpy2.mpq(1, 15), gmpy2.mpq(3, 8))
   assert frm.size == (gmpy2.mpq(22, 15), gmpy2.mpq(1, 4))
   assert not frm.is_square
+  assert frm.scale == gmpy2.mpq(1, 4)
+  assert frm.area == gmpy2.mpq(11, 30)
+  assert frm.mag2 == gmpy2.mpq(375, 22)
   # mandelbrot frame, square
   frm = frame.Frame(
     fractal=frame.Fractal('mandelbrot'),
@@ -375,6 +378,9 @@ def test_frame_asserts() -> None:
   assert str(frm) == '[MANDELBROT: (0, 0) ± 8]'
   assert frm.center == (gmpy2.mpq(0), gmpy2.mpq(0))
   assert frm.size == (gmpy2.mpq(8), gmpy2.mpq(8))
+  assert frm.scale == gmpy2.mpq(8)
+  assert frm.area == gmpy2.mpq(64)
+  assert frm.mag2 == gmpy2.mpq(25, 256)
   # julia frame
   frm = frame.Frame(
     fractal=frame.Fractal('julia'),
@@ -389,3 +395,6 @@ def test_frame_asserts() -> None:
   assert frm.center == (gmpy2.mpq(0), gmpy2.mpq(3, 2))
   assert frm.size == (gmpy2.mpq(4), gmpy2.mpq(1))
   assert not frm.is_square
+  assert frm.scale == gmpy2.mpq(1)
+  assert frm.area == gmpy2.mpq(4)
+  assert frm.mag2 == gmpy2.mpq(99, 100)