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index.test.js
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index.test.js
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"use strict";
let _eval = require("eval");
let code = require("./scripts/bundle");
/* global process */
const DEBUG = !!process.env.DEBUG;
// run test suite on eval and non-eval versions of code
let creates = [
[
"eval",
_eval(
code[DEBUG ? "fun-hooks.js" : "fun-hooks.min.js"],
"fun-hooks.min.js",
{
console
}
)
],
[
"no-eval",
_eval(
code[DEBUG ? "fun-hooks.no-eval.js" : "fun-hooks.no-eval.min.js"],
"fun-hooks.no-eval.min.js",
{
console
}
)
]
];
/* global describe, it, expect */
describe.each(creates)("%s", (_, create) => {
test("exposes named hooks", () => {
let hook = create();
let hooked1 = hook("sync", jest.fn(), "hooked1");
let hooked2 = hook("async", jest.fn(), "hooked2");
expect(hook.get("hooked1")).toEqual(hooked1);
expect(hook.get("hooked2")).toEqual(hooked2);
});
let config = {};
function genHooks(count) {
let hooks = [];
for (let i = 0; i < count; i++) {
hooks.push(
jest.fn((cb, a, b) => {
cb(a + 1, b + 1);
})
);
}
return hooks;
}
function expectCalled(arr, count) {
arr.forEach((hook, i) => {
if (i < count) {
expect(arr[i]).toBeCalled();
} else {
expect(arr[i]).not.toBeCalled();
}
});
}
function clearMocks(...arrs) {
arrs.forEach(arr => {
arr.forEach(mock => mock.mockClear());
});
}
test("calls hooked sync fn with no hooks", () => {
let hook = create(config);
let syncFn = jest.fn().mockReturnValue(3);
let hookedSyncFn = hook("sync", syncFn);
let value = hookedSyncFn(1, 2);
expect(syncFn).toBeCalledWith(1, 2);
expect(value).toEqual(3);
});
test("calls hooked async fn with no hooks", () => {
let hook = create(config);
let asyncFn = (a, b, cb) => cb(a, b, 3);
let cb = jest.fn();
let hookedAsyncFn = hook("async", asyncFn);
hookedAsyncFn(1, 2, cb);
expect(cb).toBeCalledWith(1, 2, 3);
});
test("assumes sync if not specified", () => {
let hook = create(config);
let syncFn = jest.fn((a, b) => a + b);
let hookedSyncFn = hook(syncFn);
let result;
let before = genHooks(3);
hookedSyncFn.before(before[0]);
result = hookedSyncFn(1, 2);
expectCalled(before, 1);
expect(syncFn).toBeCalled();
expect(result).toEqual(5);
});
test("calls all hooks on sync hooked fn", () => {
let hook = create(config);
let syncFn = jest.fn((a, b) => a + b);
let hookedSyncFn = hook("sync", syncFn);
let result;
let before = genHooks(3);
let after = genHooks(3);
hookedSyncFn.before(before[0]);
result = hookedSyncFn(1, 2);
expectCalled(before, 1);
expect(syncFn).toBeCalled();
expect(result).toEqual(5);
clearMocks(before, after);
hookedSyncFn.before(before[1]);
result = hookedSyncFn(1, 2);
expectCalled(before, 2);
expect(syncFn).toBeCalled();
expect(result).toEqual(7);
clearMocks(before, after);
hookedSyncFn.before(before[2]);
result = hookedSyncFn(1, 2);
expectCalled(before, 3);
expect(syncFn).toBeCalled();
expect(result).toEqual(9);
clearMocks(before, after);
hookedSyncFn.after(after[0]);
result = hookedSyncFn(1, 2);
expectCalled(before, 3);
expectCalled(after, 1);
expect(syncFn).toBeCalled();
expect(result).toEqual(10);
clearMocks(before, after);
hookedSyncFn.after(after[1]);
result = hookedSyncFn(1, 2);
expectCalled(before, 3);
expectCalled(after, 2);
expect(syncFn).toBeCalled();
expect(result).toEqual(11);
clearMocks(before, after);
hookedSyncFn.after(after[2]);
result = hookedSyncFn(1, 2);
expectCalled(before, 3);
expectCalled(after, 3);
expect(syncFn).toBeCalled();
expect(result).toEqual(12);
clearMocks(before, after);
hookedSyncFn = hook("sync", syncFn);
after = genHooks(3);
hookedSyncFn.after(after[0]);
result = hookedSyncFn(1, 2);
expectCalled(after, 1);
expect(syncFn).toBeCalled();
expect(result).toEqual(4);
clearMocks(before, after);
hookedSyncFn.after(after[1]);
result = hookedSyncFn(1, 2);
expectCalled(after, 2);
expect(syncFn).toBeCalled();
expect(result).toEqual(5);
clearMocks(before, after);
hookedSyncFn.after(after[2]);
result = hookedSyncFn(1, 2);
expectCalled(after, 3);
expect(syncFn).toBeCalled();
expect(result).toEqual(6);
});
test("calls hooks on async hooked fn", () => {
let hook = create(config);
let result;
let cb = jest.fn(function(a, b) {
result = a + b;
});
let asyncFn = jest.fn(function(a, b, cb) {
cb(a + 1, b + 1);
});
let hookedAsyncFn = hook("async", asyncFn);
let before = genHooks(3);
let after = genHooks(3);
hookedAsyncFn.before(before[0]);
hookedAsyncFn(1, 2, cb);
expectCalled(before, 1);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(7);
clearMocks(before, after);
hookedAsyncFn.before(before[1]);
hookedAsyncFn(1, 2, cb);
expectCalled(before, 2);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(9);
clearMocks(before, after);
hookedAsyncFn.before(before[2]);
hookedAsyncFn(1, 2, cb);
expectCalled(before, 3);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(11);
clearMocks(before, after);
hookedAsyncFn.after(after[0]);
hookedAsyncFn(1, 2, cb);
expectCalled(before, 3);
expectCalled(after, 1);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(13);
clearMocks(before, after);
hookedAsyncFn.after(after[1]);
hookedAsyncFn(1, 2, cb);
expectCalled(before, 3);
expectCalled(after, 2);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(15);
clearMocks(before, after);
hookedAsyncFn.after(after[2]);
hookedAsyncFn(1, 2, cb);
expectCalled(before, 3);
expectCalled(after, 3);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(17);
clearMocks(before, after);
hookedAsyncFn = hook("async", asyncFn);
after = genHooks(3);
hookedAsyncFn.after(after[0]);
hookedAsyncFn(1, 2, cb);
expectCalled(after, 1);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(7);
clearMocks(before, after);
hookedAsyncFn.after(after[1]);
hookedAsyncFn(1, 2, cb);
expectCalled(after, 2);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(9);
clearMocks(before, after);
hookedAsyncFn.after(after[2]);
hookedAsyncFn(1, 2, cb);
expectCalled(after, 3);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(11);
});
test("allows bailing early using cb.bail", () => {
let hook = create(config);
let result;
let cb = jest.fn((a, b) => (result = a + b));
let asyncFn = jest.fn((a, b, cb) => cb(a + 1, b + 1));
let syncFn = jest.fn((a, b) => a + b);
let hookedSyncFn = hook("sync", syncFn);
hookedSyncFn.after((cb, x) => cb.bail(x + 1));
result = hookedSyncFn(1, 2);
expect(result).toEqual(4);
hookedSyncFn.after((cb, x) => cb.bail(x + 2), 11);
result = hookedSyncFn(1, 2);
expect(result).toEqual(5);
hookedSyncFn.after((cb, x) => cb.bail(x + 3), 12);
result = hookedSyncFn(1, 2);
expect(result).toEqual(6);
hookedSyncFn.before(cb => cb.bail(4), 13);
result = hookedSyncFn(1, 2);
expect(result).toEqual(4);
hookedSyncFn.before(cb => cb.bail(5), 14);
result = hookedSyncFn(1, 2);
expect(result).toEqual(5);
hookedSyncFn.before(cb => cb.bail(6), 15);
result = hookedSyncFn(1, 2);
expect(result).toEqual(6);
let hookedAsyncFn = hook("async", asyncFn);
hookedAsyncFn.after((cb, x, y) => cb.bail(x + 1, y + 1));
hookedAsyncFn(1, 2, cb);
expect(result).toEqual(7);
hookedAsyncFn.after((cb, x, y) => cb.bail(x + 2, y + 2), 11);
hookedAsyncFn(1, 2, cb);
expect(result).toEqual(9);
hookedAsyncFn.after((cb, x, y) => cb.bail(x + 3, y + 3), 12);
hookedAsyncFn(1, 2, cb);
expect(result).toEqual(11);
hookedAsyncFn.before((cb, x, y) => cb.bail(x + 4, y + 4), 13);
hookedAsyncFn(1, 2, cb);
expect(result).toEqual(11); // only 11 because we bail before hooked fn now
hookedAsyncFn.before((cb, x, y) => cb.bail(x + 5, y + 5), 14);
hookedAsyncFn(1, 2, cb);
expect(result).toEqual(13);
hookedAsyncFn.before((cb, x, y) => cb.bail(x + 6, y + 6), 15);
hookedAsyncFn(1, 2, cb);
expect(result).toEqual(15);
});
test("callback to wrapped async fn should not have bail attached", () => {
let hook = create(config);
let cb = jest.fn((a, b) => a + b);
let asyncFn = jest.fn((a, b, cb) => {
expect(cb.bail).toBeUndefined();
});
let hookedAsyncFn = hook("async", asyncFn);
hookedAsyncFn(1, 2, cb);
hookedAsyncFn.after((cb, x, y) => cb.bail(x + 1, y + 1));
hookedAsyncFn(1, 2, cb);
hookedAsyncFn.before((cb, x, y) => cb.bail(x + 1, y + 1));
hookedAsyncFn(1, 2, cb);
});
test("calls before hooks on async hooked fn without callback", () => {
let hook = create(config);
let asyncFn = jest.fn();
let hookedAsyncFn = hook("async", asyncFn);
let before = genHooks(3);
hookedAsyncFn.before(before[0]);
hookedAsyncFn(1, 2);
expectCalled(before, 1);
expect(asyncFn).toBeCalledWith(2, 3);
clearMocks(before);
hookedAsyncFn.before(before[1]);
hookedAsyncFn(1, 2);
expectCalled(before, 2);
expect(asyncFn).toBeCalledWith(3, 4);
clearMocks(before);
hookedAsyncFn.before(before[2]);
hookedAsyncFn(1, 2);
expectCalled(before, 3);
expect(asyncFn).toBeCalledWith(4, 5);
});
test("hooks work correctly after removing", () => {
let hook = create(config);
let result;
let cb = jest.fn(function(a, b) {
result = a + b;
});
let asyncFn = jest.fn(function(a, b, cb) {
cb(a + 1, b + 1);
});
let hookedAsyncFn = hook("async", asyncFn);
let before = genHooks(2);
let after = genHooks(2);
hookedAsyncFn.before(before[0]);
hookedAsyncFn(1, 2, cb);
expectCalled(before, 1);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(7);
clearMocks(before, after);
hookedAsyncFn.before(before[1]);
hookedAsyncFn(1, 2, cb);
expectCalled(before, 2);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(9);
clearMocks(before, after);
hookedAsyncFn.after(after[0]);
hookedAsyncFn(1, 2, cb);
expectCalled(before, 2);
expectCalled(after, 1);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(11);
clearMocks(before, after);
hookedAsyncFn.after(after[1]);
hookedAsyncFn(1, 2, cb);
expectCalled(before, 2);
expectCalled(after, 2);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(13);
clearMocks(before, after);
hookedAsyncFn.getHooks({ hook: after[1] }).remove();
hookedAsyncFn(1, 2, cb);
expectCalled(before, 2);
expectCalled(after, 1);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(11);
clearMocks(before, after);
hookedAsyncFn.getHooks({ hook: before[1] }).remove();
hookedAsyncFn(1, 2, cb);
expectCalled(before, 1);
expectCalled(after, 1);
expect(asyncFn).toBeCalled();
expect(cb).toBeCalled();
expect(result).toEqual(9);
hookedAsyncFn.removeAll();
hookedAsyncFn(1, 2, cb);
expect(result).toEqual(5);
});
test("hooks have correct bound context", () => {
let hook = create(config);
let fnThis = {};
let beforeThis = {};
let afterThis = {};
let asyncFn = function(cb) {
expect(this).toEqual(fnThis);
cb();
};
let hookedAsyncFn = hook("async", asyncFn);
hookedAsyncFn
.before(function(cb) {
expect(this).toEqual(fnThis);
cb();
})
.after(function(cb) {
expect(this).toEqual(fnThis);
cb();
})
.before(
function(cb) {
expect(this).toEqual(beforeThis);
cb();
}.bind(beforeThis)
)
.after(
function(cb) {
expect(this).toEqual(afterThis);
cb();
}.bind(afterThis)
);
hookedAsyncFn.bind(fnThis)(function() {});
});
test("hooks run in correct priority order", () => {
let hook = create(config);
let order = [];
let callback = () => order.push(9);
let asyncFn = jest.fn(function(cb) {
order.push("fn");
cb();
});
let hookedAsyncFn = hook("async", asyncFn);
hookedAsyncFn
.before(function(next) {
order.push(2);
next();
})
.before(function(next) {
order.push(1);
next();
}, 11)
.before(function(next) {
order.push(3);
next();
})
.before(function(next) {
order.push(4);
next();
})
.after(function(next) {
order.push(7);
next();
})
.after(function(next) {
order.push(8);
next();
})
.after(function(next) {
order.push(6);
next();
}, 12)
.after(function(next) {
order.push(5);
next();
}, 13);
hookedAsyncFn(callback);
expect(order).toEqual([1, 2, 3, 4, "fn", 5, 6, 7, 8, 9]);
});
test("allows hooking objects (and prototypes)", () => {
let hook = create(config);
// should allow us to attach hooks before hookable is created
hook.get("myObj.someFun").after(function(cb, result) {
cb(result + 1);
});
hook.get("myObj.someFun2").after(function(cb, result) {
cb(result + 2);
});
let obj = Object.create({
someFun() {
return 1;
},
someFun2(cb) {
cb(2);
},
someFun3() {}
});
obj.someFun4 = function() {
return 3;
};
obj.someFun5 = function() {};
let hooks = hook(
obj,
["someFun", "async:someFun2", "sync:someFun4"],
"myObj"
);
obj.someFun4.after(function(cb, result) {
cb(result + 1);
});
expect(hooks["someFun"]).toEqual(obj.someFun);
expect(typeof obj.someFun.before).toEqual("function");
expect(typeof obj.someFun.after).toEqual("function");
expect(obj.someFun()).toEqual(2);
expect(hooks["someFun2"]).toEqual(obj.someFun2);
expect(typeof obj.someFun2.before).toEqual("function");
expect(typeof obj.someFun2.after).toEqual("function");
obj.someFun2(result => {
expect(result).toEqual(4);
});
expect(obj.someFun3.before).toBeUndefined();
expect(obj.someFun3.after).toBeUndefined();
expect(hooks["someFun4"]).toEqual(obj.someFun4);
expect(typeof obj.someFun4.before).toEqual("function");
expect(typeof obj.someFun4.after).toEqual("function");
expect(obj.someFun4()).toEqual(4);
expect(obj.someFun5.before).toBeUndefined();
expect(obj.someFun5.after).toBeUndefined();
expect(hook.get("myObj")).toEqual(hooks);
expect(hook.get("myObj").someFun).toEqual(obj.someFun);
expect(hook.get("myObj").someFun2).toEqual(obj.someFun2);
expect(hook.get("myObj").someFun4).toEqual(obj.someFun4);
expect(hook.get("myObj.someFun")).toEqual(obj.someFun);
expect(hook.get("myObj.someFun2")).toEqual(obj.someFun2);
expect(hook.get("myObj.someFun4")).toEqual(obj.someFun4);
});
test("allows us to add/remove hooks by name before a hookable is created", () => {
let hook = create(config);
function addOne(cb, a) {
cb(a + 1);
}
hook.get("myHook").before(addOne);
hook.get("myHook").after(addOne);
let myHook = hook(function(a) {
return a;
}, "myHook");
myHook.after(addOne);
expect(myHook(1)).toEqual(4);
hook.get("myObj.someFun").before(addOne);
hook.get("myObj.someFun").after(addOne);
function ten(cb) {
cb(10);
}
hook.get("myObj.someFun").after(ten);
hook
.get("myObj.someFun")
.getHooks({
hook: ten
})
.remove();
let obj = Object.create({
someFun(a) {
return a;
}
});
// hook created here should use named hooks created above.
hook(obj, ["someFun"], "myObj");
expect(obj.someFun(1)).toEqual(3);
});
test("will display warning when a hook is referenced but never created before ready", () => {
/* eslint-disable no-console */
let hook = create(
Object.assign(
{
ready: create.SYNC
},
config
)
);
let oldWarn = console.warn;
console.warn = jest.fn();
expect(console.warn).not.toHaveBeenCalled();
hook.get("myHook").before(function(cb) {
cb.bail(1);
});
hook.ready();
expect(console.warn).toHaveBeenCalled();
console.warn = oldWarn;
/* eslint-enable no-console */
});
test("will not wrap hooks more than once", () => {
let hook = create(config);
let fn = () => {};
let hookedFn = hook(fn);
let hookedFn2 = hook(hookedFn);
expect(hookedFn).toEqual(hookedFn2);
});
test("should allow us to get hooks with getHooks", () => {
let hook = create(config);
let fn = () => {};
let hookedFn = hook(fn);
let hook1 = () => {};
let hook2 = () => {};
hookedFn.before(hook1, 8);
hookedFn.before(hook1);
hookedFn.after(hook2);
let remove = hookedFn.getHooks().map(entry => entry.remove);
expect(hookedFn.getHooks().length).toEqual(3);
expect(hookedFn.getHooks()[0]).toEqual({
hook: hook1,
type: "before",
priority: 10,
remove: remove[0]
});
expect(hookedFn.getHooks()[1]).toEqual({
hook: hook1,
type: "before",
priority: 8,
remove: remove[1]
});
expect(hookedFn.getHooks()[2]).toEqual({
hook: hook2,
type: "after",
priority: 10,
remove: remove[2]
});
expect(hookedFn.getHooks({ hook: hook2 }).length).toEqual(1);
expect(hookedFn.getHooks({ hook: hook2 })[0]).toEqual({
hook: hook2,
type: "after",
priority: 10,
remove: remove[2]
});
expect(hookedFn.getHooks({ type: "before" }).length).toEqual(2);
expect(hookedFn.getHooks({ type: "before" })[0]).toEqual({
hook: hook1,
type: "before",
priority: 10,
remove: remove[0]
});
expect(hookedFn.getHooks({ type: "before" })[1]).toEqual({
hook: hook1,
type: "before",
priority: 8,
remove: remove[1]
});
expect(hookedFn.getHooks({ priority: 10 }).length).toEqual(2);
expect(hookedFn.getHooks({ priority: 10 })[0]).toEqual({
hook: hook1,
type: "before",
priority: 10,
remove: remove[0]
});
expect(hookedFn.getHooks({ priority: 10 })[1]).toEqual({
hook: hook2,
type: "after",
priority: 10,
remove: remove[2]
});
});
describe("the ready option", () => {
let before, after;
beforeEach(() => {
before = jest.fn(cb => cb());
after = jest.fn(cb => cb());
});
describe("for sync functions", () => {
describe("when sync flag not set", () => {
let hook, fn, hookedFn;
beforeEach(() => {
hook = create(
Object.assign(
{
ready: create.ASYNC
},
config
)
);
fn = jest.fn(() => {});
hookedFn = hook(fn);
});
it("should run instantly with no hooks", () => {
hookedFn();
expect(fn).toBeCalled();
});
it("should run instantly with before hooks", () => {
hookedFn.before(before);
hookedFn();
expect(fn).toBeCalled();
expect(before).toBeCalled();
});
it("should run instantly with after hooks", () => {
hookedFn.after(after);
hookedFn();
expect(fn).toBeCalled();
expect(after).toBeCalled();
});
});
describe("when sync flag is set but not ready", () => {
let hook, fn, hookedFn;
beforeEach(() => {
hook = create(
Object.assign(
{
ready: create.SYNC
},
config
)
);
fn = jest.fn(() => {});
hookedFn = hook(fn);
});
it("should throw when not ready but run when ready with no hooks", () => {
expect(hookedFn).toThrow();
expect(fn).not.toBeCalled();
hook.ready();
expect(hookedFn).not.toThrow();
expect(fn).toBeCalled();
});
it("should throw when not ready but run when ready with before hooks", () => {
hookedFn.before(before);
expect(hookedFn).toThrow();
expect(fn).not.toBeCalled();
expect(before).not.toBeCalled();
hook.ready();
expect(hookedFn).not.toThrow();
expect(fn).toBeCalled();
expect(before).toBeCalled();
});
it("should throw when not ready but run when ready with after hooks", () => {
hookedFn.after(after);
expect(hookedFn).toThrow();
expect(fn).not.toBeCalled();
expect(after).not.toBeCalled();
hook.ready();
expect(hookedFn).not.toThrow();
expect(fn).toBeCalled();
expect(after).toBeCalled();
});
});
});
describe("for async functions", () => {
describe("with async flag not set", () => {
let hook, cb, fn, hookedFn;
beforeEach(() => {
hook = create(
Object.assign(
{
ready: create.SYNC
},
config
)
);
cb = jest.fn(() => {});
fn = jest.fn(cb => cb());
hookedFn = hook("async", fn);
});
it("should run instantly with no hooks", () => {
hookedFn(cb);
expect(fn).toBeCalled();
});
it("should run instantly with before hooks", () => {
hookedFn.before(before);
hookedFn(cb);
expect(fn).toBeCalled();
expect(before).toBeCalled();
});
it("should run instantly with after hooks", () => {
hookedFn.after(after);
hookedFn(cb);
expect(fn).toBeCalled();
expect(after).toBeCalled();
});
});
describe("with async flag set", () => {
let hook, cb, fn, hookedFn;
beforeEach(() => {
hook = create(
Object.assign(
{
ready: create.ASYNC
},
config
)
);
cb = jest.fn(() => {});
fn = jest.fn(cb => cb());
hookedFn = hook("async", fn);
});
it("should throw when not ready but run when ready with no hooks", () => {
expect(function() {
hookedFn(cb);
}).toThrow();
expect(fn).not.toBeCalled();
hook.ready();
expect(function() {
hookedFn(cb);
}).not.toThrow();
expect(fn).toBeCalled();
});
it("should throw when not ready but run when ready with before hooks", () => {
hookedFn.before(before);
expect(function() {
hookedFn(cb);
}).toThrow();
expect(fn).not.toBeCalled();
expect(before).not.toBeCalled();
hook.ready();
expect(function() {
hookedFn(cb);
}).not.toThrow();
expect(fn).toBeCalled();
expect(before).toBeCalled();
});
it("should throw when not ready but run when ready with after hooks", () => {
hookedFn.after(after);
expect(function() {
hookedFn(cb);
}).toThrow();
expect(fn).not.toBeCalled();
expect(after).not.toBeCalled();
hook.ready();
expect(function() {
hookedFn(cb);
}).not.toThrow();
expect(fn).toBeCalled();
expect(after).toBeCalled();
});
});
describe("with async and queue flags set", () => {
let hook, cb, fn, hookedFn;
beforeEach(() => {
hook = create(
Object.assign(