test IFDRational equality

Tests/test_tiff_ifdrational.py

@@ -29,6 +29,13 @@ def test_sanity():
     _test_equal(1, 2, IFDRational(1, 2))
 
 
+def test_ranges():
+
+    for num in range(1, 10):
+        for denom in range(1, 10):
+            assert IFDRational(num, denom) == IFDRational(num, denom)
+
+
 def test_nonetype():
     # Fails if the _delegate function doesn't return a valid function
 
@@ -43,6 +50,12 @@ def test_nonetype():
     assert xres and yres
 
 
+def test_nan():
+    # usually NaN != NaN, but this would break exif self-equality
+
+    assert IFDRational(123, 0) == IFDRational(123, 0)
+
+
 def test_ifd_rational_save(tmp_path):
     methods = (True, False)
     if not features.check("libtiff"):