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test.js
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const test = require("tape")
const { createStore, applyMiddleware } = require("redux")
const { before, after, around, not } = require("./index")
test("before middleware runs before reducer", (t) => {
const callOrder = []
const reducer = () => { callOrder.push("reducer"); return {} }
const middleware = (store, action) => { callOrder.push("middleware"); return action }
// createStore dispatches an init action, but only to the reducer
const store = createStore(reducer, applyMiddleware(before(middleware)))
t.deepEquals(callOrder, ["reducer"])
store.dispatch({ type: "foo" })
t.deepEquals(callOrder, ["reducer", "middleware", "reducer"])
store.dispatch({ type: "bar" })
t.deepEquals(callOrder, ["reducer", "middleware", "reducer", "middleware", "reducer"])
t.end()
})
test("after middleware runs after reducer", (t) => {
const callOrder = []
const reducer = () => { callOrder.push("reducer"); return {} }
const middleware = (store, action) => { callOrder.push("middleware"); return action }
const store = createStore(reducer, applyMiddleware(after(middleware)))
t.deepEquals(callOrder, ["reducer"])
store.dispatch({ type: "foo" })
t.deepEquals(callOrder, ["reducer", "reducer", "middleware"])
store.dispatch({ type: "bar" })
t.deepEquals(callOrder, ["reducer", "reducer", "middleware", "reducer", "middleware"])
t.end()
})
test("before middlewares run in order, after middlewares run in reverse order", (t) => {
const callOrder = []
const reducer = () => { callOrder.push("reducer"); return {} }
const firstBefore = (store, action) => { callOrder.push("firstBefore"); return action }
const secondBefore = (store, action) => { callOrder.push("secondBefore"); return action }
const firstAfter = (store, action) => { callOrder.push("firstAfter"); return action }
const secondAfter = (store, action) => { callOrder.push("secondAfter"); return action }
const store = createStore(reducer, applyMiddleware(
before(firstBefore),
before(secondBefore),
after(firstAfter),
after(secondAfter)
))
t.deepEquals(callOrder, ["reducer"])
store.dispatch({ type: "foo" })
t.deepEquals(callOrder, ["reducer", "firstBefore", "secondBefore", "reducer", "secondAfter", "firstAfter"])
// empty call order array
callOrder.splice(0, 100)
const anotherStore = createStore(reducer, applyMiddleware(
after(firstAfter),
after(secondAfter),
before(firstBefore),
before(secondBefore)
))
t.deepEquals(callOrder, ["reducer"])
anotherStore.dispatch({ type: "foo" })
t.deepEquals(callOrder, ["reducer", "firstBefore", "secondBefore", "reducer", "secondAfter", "firstAfter"])
t.end()
})
test("around is just regular middleware with a less ponderous function signature", (t) => {
const callOrder = []
const reducer = () => { callOrder.push("reducer"); return {} }
const middleware = (store, next, action) => {
callOrder.push("middleware before")
const nextAction = next(action)
callOrder.push("middleware after")
return nextAction
}
const store = createStore(reducer, applyMiddleware(around("foo", middleware)))
t.deepEquals(callOrder, ["reducer"])
store.dispatch({ type: "foo" })
t.deepEquals(callOrder, ["reducer", "middleware before", "reducer", "middleware after"])
t.end()
})
test("matcher as string matches action.type", (t) => {
const callOrder = []
const reducer = () => { callOrder.push("reducer"); return {} }
const middleware = (store, action) => { callOrder.push("middleware"); return action }
const store = createStore(reducer, applyMiddleware(before("foo", middleware)))
t.deepEquals(callOrder, ["reducer"])
store.dispatch({ type: "bar" })
t.deepEquals(callOrder, ["reducer", "reducer"])
store.dispatch({ type: "foo" })
t.deepEquals(callOrder, ["reducer", "reducer", "middleware", "reducer"])
t.end()
})
test("matcher as array matches multiple action types", (t) => {
const callOrder = []
const reducer = () => { callOrder.push("reducer"); return {} }
const middleware = (store, action) => { callOrder.push(`middleware: ${action.type}`); return action }
const store = createStore(reducer, applyMiddleware(before(["foo", "bar"], middleware)))
t.deepEquals(callOrder, ["reducer"])
store.dispatch({ type: "foo" })
t.deepEquals(callOrder, ["reducer", "middleware: foo", "reducer"])
store.dispatch({ type: "bar" })
t.deepEquals(callOrder, ["reducer", "middleware: foo", "reducer", "middleware: bar", "reducer"])
store.dispatch({ type: "quux" })
t.deepEquals(callOrder, ["reducer", "middleware: foo", "reducer", "middleware: bar", "reducer", "reducer"])
t.end()
})
test("matcher as function", (t) => {
const callOrder = []
const reducer = () => { callOrder.push("reducer"); return {} }
const middleware = (store, action) => { callOrder.push(`middleware: ${action.type}`); return action }
const store = createStore(reducer, applyMiddleware(
before((action) => action && /^foo_/.test(action.type), middleware)
))
t.deepEquals(callOrder, ["reducer"])
store.dispatch({ type: "foo_x" })
t.deepEquals(callOrder, ["reducer", "middleware: foo_x", "reducer"])
store.dispatch({ type: "bar" })
t.deepEquals(callOrder, ["reducer", "middleware: foo_x", "reducer", "reducer"])
t.end()
})
test("not(matcher) inverts match function", (t) => {
const callOrder = []
const reducer = () => { callOrder.push("reducer"); return {} }
const middleware = (store, action) => { callOrder.push("middleware"); return action }
const store = createStore(reducer, applyMiddleware(before(not("foo"), middleware)))
t.deepEquals(callOrder, ["reducer"])
store.dispatch({ type: "foo" })
t.deepEquals(callOrder, ["reducer", "reducer"])
store.dispatch({ type: "bar" })
t.deepEquals(callOrder, ["reducer", "reducer", "middleware", "reducer"])
t.end()
})
test("middleware returning undefined ends dispatch", (t) => {
const callOrder = []
const reducer = () => { callOrder.push("reducer"); return {} }
const firstMiddleware = (store, action) => { callOrder.push("firstMiddleware"); return action }
const dropMiddleware = (store, action) => { callOrder.push("dropMiddleware"); return undefined }
const lastMiddleware = (store, action) => { callOrder.push("lastMiddleware"); return action }
const store = createStore(reducer, applyMiddleware(
before(firstMiddleware),
before("dropped", dropMiddleware),
before(lastMiddleware)
))
t.deepEquals(callOrder, ["reducer"])
store.dispatch({ type: "foo" })
t.deepEquals(callOrder,
["reducer", "firstMiddleware", "lastMiddleware", "reducer"])
store.dispatch({ type: "dropped" })
t.deepEquals(callOrder,
["reducer", "firstMiddleware", "lastMiddleware", "reducer", "firstMiddleware", "dropMiddleware"])
t.end()
})