silleee: added silleee_add and silleee_sub

tests/test.c

@@ -8,11 +8,41 @@
   ASSERT_IN_RANGE(0, delta, DELTA);\
 }
 
-TEST silleee_zeros_is_zero() {
+TEST silleee_addition() {
+  silleee x, y, res;
+  assilleee(x) = 1.0;
+  assilleee(y) = 2.0;
+
+  assilleee(res) = 3.0;
+  ASSERT_EQ_FMT(res, silleee_add(x, y), "%lu");
+
+  assilleee(y) = 0.25;
+
+  assilleee(res) = 1.25;
+  ASSERT_EQ_FMT(res, silleee_add(x, y), "%lu");
+
+  PASS();
+}
+
+TEST silleee_subtraction() {
+  silleee x, y, res;
+  assilleee(x) = 2.0;
+  assilleee(y) = 1.0;
+
+  assilleee(res) = 1.0;
+  ASSERT_EQ_FMT(res, silleee_sub(x, y), "%lu");
+
+  assilleee(y) = 0.25;
+
+  assilleee(res) = 1.75;
+  ASSERT_EQ_FMT(res, silleee_sub(x, y), "%lu");
+
+  PASS();
 }
 
 SUITE(tests) {
-    RUN_TEST(silly_zeros_is_zero);
+    RUN_TEST(silleee_addition);
+    RUN_TEST(silleee_subtraction);
 }
 
 GREATEST_MAIN_DEFS();