1 files changed, 158 insertions, 0 deletions
diff --git a/packages/merchant-backoffice-ui/tests/hooks/async.test.ts b/packages/merchant-backoffice-ui/tests/hooks/async.test.ts
new file mode 100644
index 000000000..a6d0cddfa
--- /dev/null
+++ b/packages/merchant-backoffice-ui/tests/hooks/async.test.ts
@@ -0,0 +1,158 @@
+/*
+ This file is part of GNU Taler
+ (C) 2021 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+import { renderHook } from "@testing-library/preact-hooks"
+import { useAsync } from "../../src/hooks/async"
+
+/**
+*
+* @author Sebastian Javier Marchano (sebasjm)
+*/
+test("async function is called", async () => {
+  jest.useFakeTimers()
+
+  const timeout = 500
+
+  const asyncFunction = jest.fn(() => new Promise((res) => {
+    setTimeout(() => {
+      res({ the_answer: 'yes' })
+    }, timeout);
+  }))
+
+  const { result, waitForNextUpdate } = renderHook(() => {
+    return useAsync(asyncFunction)
+  })
+
+  expect(result.current?.isLoading).toBeFalsy()
+
+  result.current?.request()
+  expect(asyncFunction).toBeCalled()
+  await waitForNextUpdate({ timeout: 1 })
+  expect(result.current?.isLoading).toBeTruthy()
+
+  jest.advanceTimersByTime(timeout + 1)
+  await waitForNextUpdate({ timeout: 1 })
+  expect(result.current?.isLoading).toBeFalsy()
+  expect(result.current?.data).toMatchObject({ the_answer: 'yes' })
+  expect(result.current?.error).toBeUndefined()
+  expect(result.current?.isSlow).toBeFalsy()
+})
+
+test("async function return error if rejected", async () => {
+  jest.useFakeTimers()
+
+  const timeout = 500
+
+  const asyncFunction = jest.fn(() => new Promise((_, rej) => {
+    setTimeout(() => {
+      rej({ the_error: 'yes' })
+    }, timeout);
+  }))
+
+  const { result, waitForNextUpdate } = renderHook(() => {
+    return useAsync(asyncFunction)
+  })
+
+  expect(result.current?.isLoading).toBeFalsy()
+
+  result.current?.request()
+  expect(asyncFunction).toBeCalled()
+  await waitForNextUpdate({ timeout: 1 })
+  expect(result.current?.isLoading).toBeTruthy()
+
+  jest.advanceTimersByTime(timeout + 1)
+  await waitForNextUpdate({ timeout: 1 })
+  expect(result.current?.isLoading).toBeFalsy()
+  expect(result.current?.error).toMatchObject({ the_error: 'yes' })
+  expect(result.current?.data).toBeUndefined()
+  expect(result.current?.isSlow).toBeFalsy()
+})
+
+test("async function is slow", async () => {
+  jest.useFakeTimers()
+
+  const timeout = 2200
+
+  const asyncFunction = jest.fn(() => new Promise((res) => {
+    setTimeout(() => {
+      res({ the_answer: 'yes' })
+    }, timeout);
+  }))
+
+  const { result, waitForNextUpdate } = renderHook(() => {
+    return useAsync(asyncFunction)
+  })
+
+  expect(result.current?.isLoading).toBeFalsy()
+
+  result.current?.request()
+  expect(asyncFunction).toBeCalled()
+  await waitForNextUpdate({ timeout: 1 })
+  expect(result.current?.isLoading).toBeTruthy()
+
+  jest.advanceTimersByTime(timeout / 2)
+  await waitForNextUpdate({ timeout: 1 })
+  expect(result.current?.isLoading).toBeTruthy()
+  expect(result.current?.isSlow).toBeTruthy()
+  expect(result.current?.data).toBeUndefined()
+  expect(result.current?.error).toBeUndefined()
+
+  jest.advanceTimersByTime(timeout / 2)
+  await waitForNextUpdate({ timeout: 1 })
+  expect(result.current?.isLoading).toBeFalsy()
+  expect(result.current?.data).toMatchObject({ the_answer: 'yes' })
+  expect(result.current?.error).toBeUndefined()
+  expect(result.current?.isSlow).toBeFalsy()
+
+})
+
+test("async function is cancellable", async () => {
+  jest.useFakeTimers()
+
+  const timeout = 2200
+
+  const asyncFunction = jest.fn(() => new Promise((res) => {
+    setTimeout(() => {
+      res({ the_answer: 'yes' })
+    }, timeout);
+  }))
+
+  const { result, waitForNextUpdate } = renderHook(() => {
+    return useAsync(asyncFunction)
+  })
+
+  expect(result.current?.isLoading).toBeFalsy()
+
+  result.current?.request()
+  expect(asyncFunction).toBeCalled()
+  await waitForNextUpdate({ timeout: 1 })
+  expect(result.current?.isLoading).toBeTruthy()
+
+  jest.advanceTimersByTime(timeout / 2)
+  await waitForNextUpdate({ timeout: 1 })
+  expect(result.current?.isLoading).toBeTruthy()
+  expect(result.current?.isSlow).toBeTruthy()
+  expect(result.current?.data).toBeUndefined()
+  expect(result.current?.error).toBeUndefined()
+
+  result.current?.cancel()
+  await waitForNextUpdate({ timeout: 1 })
+  expect(result.current?.isLoading).toBeFalsy()
+  expect(result.current?.data).toBeUndefined()
+  expect(result.current?.error).toBeUndefined()
+  expect(result.current?.isSlow).toBeFalsy()
+
+})