diff --git a/kitty_tests/fonts.py b/kitty_tests/fonts.py
index 8bfae02c9..34210fe68 100644
--- a/kitty_tests/fonts.py
+++ b/kitty_tests/fonts.py
@@ -132,3 +132,9 @@ def test_coalesce_symbol_maps(self):
         self.ae(coalesce_symbol_maps(q), {(1, 1): 'a', (2, 3): 'b', (4, 4): 'a'})
         q = {(2, 3): 'b', (1, 4): 'a'}
         self.ae(coalesce_symbol_maps(q), {(1, 4): 'a'})
+        q = {(1, 4): 'a', (2, 5): 'b'}
+        self.ae(coalesce_symbol_maps(q), {(1, 1): 'a', (2, 5): 'b'})
+        q = {(2, 5): 'b', (1, 4): 'a'}
+        self.ae(coalesce_symbol_maps(q), {(1, 4): 'a', (5, 5): 'b'})
+        q = {(1, 4): 'a', (2, 5): 'a'}
+        self.ae(coalesce_symbol_maps(q), {(1, 5): 'a'})