diff --git a/test/test_addition.c b/test/test_addition.c
index 02db089..6177f55 100644
--- a/test/test_addition.c
+++ b/test/test_addition.c
@@ -97,4 +97,22 @@ void test_addition_addition_basecaseonescolumns(void)
     TEST_ASSERT_EQUAL_INT(expected[1], result[1]);
 }
 
+void test_addition_addition_basecasetotenscolumns(void)
+{
+    int result[5];
+    int expected[5] = { 3, 3, 2, 3, 3 };
+
+    result[0] = addition(0, 3);
+    result[1] = addition(1, 2);
+    result[2] = addition(1, 1);
+    result[3] = addition(2, 1);
+    result[4] = addition(3, 0);
+
+    TEST_ASSERT_EQUAL_INT(expected[0], result[0]);
+    TEST_ASSERT_EQUAL_INT(expected[1], result[1]);
+    TEST_ASSERT_EQUAL_INT(expected[2], result[2]);
+    TEST_ASSERT_EQUAL_INT(expected[3], result[3]);
+    TEST_ASSERT_EQUAL_INT(expected[4], result[4]);
+}
+
 #endif // TEST