diff --git a/src/test/test_funktionen.c b/src/test/test_funktionen.c
index cd2c30c..ba69ca8 100644
--- a/src/test/test_funktionen.c
+++ b/src/test/test_funktionen.c
@@ -37,4 +37,17 @@ void test_11_multiplied_by_11(void)
     TEST_ASSERT_EQUAL_INT(expected, actual);
 }
 
+void test_5_minus_2(void)
+{
+    /* arrange */
+    int actual;
+    int expected = 3;
+
+    /* act */
+    actual = subtract(5, 2);
+
+    /* assert */
+    TEST_ASSERT_EQUAL_INT(expected, actual);
+}
+
 #endif
\ No newline at end of file