diff --git a/test/test_addition.c b/test/test_addition.c
index 8af2427..02db089 100644
--- a/test/test_addition.c
+++ b/test/test_addition.c
@@ -85,4 +85,16 @@ void test_addition_addition_basecasezeropluszeroequalzero(void)
     TEST_ASSERT_EQUAL_INT(expected, result);
 }
 
+void test_addition_addition_basecaseonescolumns(void)
+{
+    int result[2];
+    int expected[2] = { 1, 1 };
+
+    result[0] = addition(1, 0);
+    result[1] = addition(0, 1);
+
+    TEST_ASSERT_EQUAL_INT(expected[0], result[0]);
+    TEST_ASSERT_EQUAL_INT(expected[1], result[1]);
+}
+
 #endif // TEST