unittest addition

test/test_minirechner.c

@@ -31,4 +31,9 @@ void test_minitaschenrechner_minus1_plus_minus3(void)
     TEST_ASSERT_EQUAL(-4, result);
 }
 
+void test_minitaschenrechner_0_plus_2(void)
+{
+    float result = addieren(0, 2);
+    TEST_ASSERT_EQUAL(2, result);
+}
 #endif // TEST