Add tests for address helper

core/test/helpers.test.ts

@@ -0,0 +1,39 @@
+/* eslint-disable @typescript-eslint/no-unused-expressions */
+import { expect } from "chai"
+import { ZeroAddress } from "ethers"
+
+import { isNonZeroAddress } from "../helpers/address"
+
+const ADDRESS_1: string = "0xb894c3967CFb58A5c55f1de4131d126B1eFA1EE0"
+const ADDRESS_1_LOWERCASE: string = ADDRESS_1.toLowerCase()
+const ADDRESS_1_NO_PREFIX: string = ADDRESS_1.substring(2)
+const ADDRESS_INVALID: string = "0xXYZ4c3967CFb58A5c55f1de4131d126B1eFA1EE0"
+const ADDRESS_ZERO: string = ZeroAddress
+
+describe("Helpers", () => {
+  describe("address", () => {
+    describe("isNonZeroAddress", () => {
+      it("should return true for valid checksumed address", () => {
+        expect(isNonZeroAddress(ADDRESS_1)).to.be.true
+      })
+
+      it("should return true for lowercase address", () => {
+        expect(isNonZeroAddress(ADDRESS_1_LOWERCASE)).to.be.true
+      })
+
+      it("should return true for address without 0x prefix", () => {
+        expect(isNonZeroAddress(ADDRESS_1_NO_PREFIX)).to.be.true
+      })
+
+      it("should return false for zero address", () => {
+        expect(isNonZeroAddress(ADDRESS_ZERO)).to.be.false
+      })
+
+      it("should throw an error for address containing invalid character", () => {
+        expect(() => {
+          isNonZeroAddress(ADDRESS_INVALID)
+        }).to.throw("invalid address")
+      })
+    })
+  })
+})