test: add unit tests

apps/cowswap-frontend/src/modules/ordersTable/utils/getFeeToken.test.ts

@@ -0,0 +1,37 @@
+import { getFeeToken } from './getFeeToken' // Adjust the import path as necessary
+
+import { ordersMock } from '../pure/OrdersTableContainer/orders.mock'
+
+const BASE_ORDER = ordersMock[3]
+
+describe('getFeeToken', () => {
+  it("should return inputToken when that's the fee token", () => {
+    const input = BASE_ORDER
+    const expectedOutput = BASE_ORDER.inputToken
+
+    const result = getFeeToken(input)
+
+    expect(result).toEqual(expectedOutput)
+  })
+
+  it("should return outputToken when that's the fee token", () => {
+    const input = {
+      ...BASE_ORDER,
+      executionData: { ...BASE_ORDER.executionData, executedFeeToken: BASE_ORDER.outputToken.address },
+    }
+    const expectedOutput = BASE_ORDER.outputToken
+
+    const result = getFeeToken(input)
+
+    expect(result).toEqual(expectedOutput)
+  })
+
+  it('should return inputToken when there is no fee token', () => {
+    const input = { ...BASE_ORDER, executionData: { ...BASE_ORDER.executionData, executedFeeToken: null } }
+    const expectedOutput = BASE_ORDER.inputToken
+
+    const result = getFeeToken(input)
+
+    expect(result).toEqual(expectedOutput)
+  })
+})