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70 lines
2.3 KiB
JavaScript
70 lines
2.3 KiB
JavaScript
"use strict";
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const assert = require("node:assert/strict");
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const {make_stub} = require("./lib/stub.cjs");
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const {run_test, noop} = require("./lib/test.cjs");
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/*
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The previous example was a bit extreme. Generally we just
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use the make_stub helper that comes with zjsunit.
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We will step away from the actual Zulip codebase for a
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second and just explore a contrived example.
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*/
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run_test("explore make_stub", ({override}) => {
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// Let's say you have to test the following code.
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const app = {
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/* istanbul ignore next */
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notify_server_of_deposit(deposit_amount) {
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// simulate difficulty
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throw new Error(`We cannot report this value without wifi: ${deposit_amount}`);
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},
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/* istanbul ignore next */
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pop_up_fancy_confirmation_screen(deposit_amount, label) {
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// simulate difficulty
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throw new Error(`We cannot make a ${label} dialog for amount ${deposit_amount}`);
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},
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};
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let balance = 40;
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function deposit_paycheck(paycheck_amount) {
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balance += paycheck_amount;
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app.notify_server_of_deposit(paycheck_amount);
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app.pop_up_fancy_confirmation_screen(paycheck_amount, "paycheck");
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}
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// Our deposit_paycheck should be easy to unit test for its
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// core functionality (updating your balance), but the side
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// effects get in the way. We have to override them to do
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// the simple test here.
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override(app, "notify_server_of_deposit", noop);
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override(app, "pop_up_fancy_confirmation_screen", noop);
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deposit_paycheck(10);
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assert.equal(balance, 50);
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// But we can do a little better here. Even though
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// the two side-effect functions are awkward here, we can
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// at least make sure they are invoked correctly. Let's
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// use stubs.
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const notify_stub = make_stub();
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const pop_up_stub = make_stub();
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// This time we'll just use our override helper to connect the
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// stubs.
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override(app, "notify_server_of_deposit", notify_stub.f);
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override(app, "pop_up_fancy_confirmation_screen", pop_up_stub.f);
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deposit_paycheck(25);
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assert.equal(balance, 75);
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assert.deepEqual(notify_stub.get_args("amount"), {amount: 25});
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assert.deepEqual(pop_up_stub.get_args("amount", "label"), {amount: 25, label: "paycheck"});
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});
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