Fixed bug in test example

diff --git a/testing/Writing.md b/testing/Writing.md
index c62098e30fafe9a3ec26c1c2c871057e61a60545..59182dc19ace3d84b2202f7c928a56a33fefa91e 100755 (executable)
--- a/testing/Writing.md
+++ b/testing/Writing.md
@@ -79,7 +79,7 @@ But this isn't very modular, and modularity is a good design principle, so let's
     def test_g():
         assert calculate_weight('G') == NUCLEOTIDES['G']
     def test_ga():
-        assert calculate_weight('GA') == NUCLEOTIDES['GA'] + NUCLEOTIDES['A']
+        assert calculate_weight('GA') == NUCLEOTIDES['G'] + NUCLEOTIDES['A']
 
     test_a()
     test_g()