add payments tests

src/payments.test.ts

@@ -0,0 +1,44 @@
+import { Percent, Token } from '@uniswap/sdk-core'
+import JSBI from 'jsbi'
+import { Payments } from './payments'
+
+const recipient = '0x0000000000000000000000000000000000000003'
+const amount = JSBI.BigInt(123)
+
+const feeOptions = {
+  fee: new Percent(1, 1000),
+  recipient: '0x0000000000000000000000000000000000000009'
+}
+
+const token = new Token(1, '0x0000000000000000000000000000000000000001', 18, 't0', 'token0')
+
+describe('Payments', () => {
+  describe('#encodeUnwrapWETH9',  () => {
+    it('works without feeOptions', () => {
+        const calldata = Payments.encodeUnwrapWETH9(amount, recipient)
+        expect(calldata).toBe('0x49404b7c000000000000000000000000000000000000000000000000000000000000007b0000000000000000000000000000000000000000000000000000000000000003')
+    })
+
+    it('works with feeOptions', () => {
+      const calldata = Payments.encodeUnwrapWETH9(amount, recipient, feeOptions)
+      expect(calldata).toBe('0x9b2c0a37000000000000000000000000000000000000000000000000000000000000007b0000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000009')
+    })
+  })
+
+  describe('#encodeSweepToken',  () => {
+    it('works without feeOptions', () => {
+        const calldata = Payments.encodeSweepToken(token, amount, recipient)
+        expect(calldata).toBe('0xdf2ab5bb0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000007b0000000000000000000000000000000000000000000000000000000000000003')
+    })
+
+    it('works with feeOptions', () => {
+      const calldata = Payments.encodeSweepToken(token, amount, recipient, feeOptions)
+      expect(calldata).toBe('0xe0e189a00000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000007b0000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000009')
+    })
+  })
+
+  it('#encodeRefundETH', () => {
+      const calldata = Payments.encodeRefundETH()
+      expect(calldata).toBe('0x12210e8a')
+  })
+})