safeMath tests

test/safeMath.js

@@ -0,0 +1,35 @@
+/* These tests are only for mul and add overflows.
+sub, div, rounded div covered by other test cases
+*/
+
+const BigNumber = require("bignumber.js");
+const Locker = artifacts.require("./Locker.sol");
+const testHelpers = require("./helpers/testHelpers.js");
+const MonetarySupervisor = artifacts.require("./MonetarySupervisor.sol");
+
+let locker;
+let monetarySupervisor;
+const MAX_UINT256 = new BigNumber(2).pow(256).sub(1);
+
+contract("SafeMath", () => {
+    before(() => {
+        locker = Locker.at(Locker.address);
+        monetarySupervisor = MonetarySupervisor.at(MonetarySupervisor.address);
+    });
+
+    it("should throw if mul overflows", async function() {
+        await testHelpers.expectThrow(
+            locker.calculateInterest(
+                2,
+                MAX_UINT256.add(1)
+                    .div(2)
+                    .round(0, BigNumber.ROUND_UP)
+            )
+        );
+    });
+
+    it("should throw if add overflows", async function() {
+        await monetarySupervisor.issueToReserve(1);
+        await testHelpers.expectThrow(monetarySupervisor.issueToReserve(MAX_UINT256.toString()));
+    });
+});