Fixed negation issue, moved some scripts to test/

test/arithmetic.toy

@@ -0,0 +1,15 @@
+//test operators (integers)
+assert 1 + 1 == 2, "1 + 1 == 2";
+assert 1 - 1 == 0, "1 - 1 == 0";
+assert 2 * 2 == 4, "2 * 2 == 4";
+assert 1 / 2 == 0, "1 / 2 == 0"; //integer division
+assert 5 % 2 == 1, "5 % 2 == 1";
+
+//test operators (floats)
+assert 1.0 + 1.0 == 2.0, "1.0 + 1.0 == 2.0";
+assert 1.0 - 1.0 == 0.0, "1.0 - 1.0 == 0.0";
+assert 2.0 * 2.0 == 4.0, "2.0 * 2.0 == 4.0";
+assert 1.0 / 2.0 == 0.5, "1.0 / 2.0 == 0.5";
+
+
+print "All good";