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open TestFramework
open ReactTestUtils
open Belt
module Console = {
type fn
let disableError: unit => fn = %raw(`
function() {
var fn = console.error
console.error = () => {}
}
`)
let restoreError: fn => unit = %raw(`
function(fn){
console.error = fn
}
`)
}
module DummyStatefulComponent = {
@react.component
let make = (~initialValue=0, ()) => {
let (value, setValue) = React.useState(() => initialValue)
<button onClick={_ => setValue(value => value + 1)}> {value->React.int} </button>
}
}
module DummyReducerComponent = {
type action =
| Increment
| Decrement
@react.component
let make = (~initialValue=0, ()) => {
let (state, send) = React.useReducer((state, action) =>
switch action {
| Increment => state + 1
| Decrement => state - 1
}
, initialValue)
<>
<div className="value"> {state->React.int} </div>
<button onClick={_ => send(Increment)}> {"Increment"->React.string} </button>
<button onClick={_ => send(Decrement)}> {"Decrement"->React.string} </button>
</>
}
}
module DummyReducerWithMapStateComponent = {
type action =
| Increment
| Decrement
@react.component
let make = (~initialValue=0, ()) => {
let (state, send) = React.useReducerWithMapState(
(state, action) =>
switch action {
| Increment => state + 1
| Decrement => state - 1
},
initialValue,
initialValue => initialValue + 1,
)
<>
<div className="value"> {state->React.int} </div>
<button onClick={_ => send(Increment)}> {"Increment"->React.string} </button>
<button onClick={_ => send(Decrement)}> {"Decrement"->React.string} </button>
</>
}
}
module DummyComponentWithEffect = {
@react.component
let make = (~value=0, ~callback, ()) => {
React.useEffect1(() => {
callback(value)
None
}, [value])
<div />
}
}
module DummyComponentWithLayoutEffect = {
@react.component
let make = (~value=0, ~callback, ()) => {
React.useLayoutEffect1(() => {
callback(value)
None
}, [value])
<div />
}
}
module DummyComponentWithRefAndEffect = {
@react.component
let make = (~callback, ()) => {
let myRef = React.useRef(1)
React.useEffect0(() => {
myRef.current = myRef.current + 1
callback(myRef)
None
})
<div />
}
}
module DummyComponentThatMapsChildren = {
@react.component
let make = (~children, ()) =>
<div>
{children->React.Children.mapWithIndex((element, index) =>
React.cloneElement(element, {"key": j`$index`, "data-index": index})
)}
</div>
}
module DummyContext = {
let context = React.createContext(0)
module Provider = {
include React.Context
let make = context->React.Context.provider
}
module Consumer = {
@react.component
let make = () => {
let value = React.useContext(context)
<div> {value->React.int} </div>
}
}
}
module ComponentThatThrows = {
exception TestError
@react.component
let make = (~shouldThrow=true, ~value) => {
if shouldThrow {
raise(TestError)
}
<div> {value->React.int} </div>
}
}
describe("React", ({test, beforeEach, afterEach}) => {
let container = ref(None)
beforeEach(prepareContainer(container))
afterEach(cleanupContainer(container))
test("can render DOM elements", ({expect}) => {
let container = getContainer(container)
act(() => ReactDOM.render(<div> {"Hello world!"->React.string} </div>, container))
expect.bool(
container->DOM.findBySelectorAndTextContent("div", "Hello world!")->Option.isSome,
).toBeTrue()
})
test("can render null elements", ({expect}) => {
let container = getContainer(container)
act(() => ReactDOM.render(<div> React.null </div>, container))
expect.bool(
container->DOM.findBySelectorAndPartialTextContent("div", "")->Option.isSome,
).toBeTrue()
})
test("can render string elements", ({expect}) => {
let container = getContainer(container)
act(() => ReactDOM.render(<div> {"Hello"->React.string} </div>, container))
expect.bool(
container->DOM.findBySelectorAndPartialTextContent("div", "Hello")->Option.isSome,
).toBeTrue()
})
test("can render int elements", ({expect}) => {
let container = getContainer(container)
act(() => ReactDOM.render(<div> {12345->React.int} </div>, container))
expect.bool(
container->DOM.findBySelectorAndPartialTextContent("div", "12345")->Option.isSome,
).toBeTrue()
})
test("can render float elements", ({expect}) => {
let container = getContainer(container)
act(() => ReactDOM.render(<div> {12.345->React.float} </div>, container))
expect.bool(
container->DOM.findBySelectorAndPartialTextContent("div", "12.345")->Option.isSome,
).toBeTrue()
})
test("can render array of elements", ({expect}) => {
let container = getContainer(container)
let array = [1, 2, 3]->Array.map(item => <div key=j`$item`> {item->React.int} </div>)
act(() => ReactDOM.render(<div> {array->React.array} </div>, container))
expect.bool(
container->DOM.findBySelectorAndPartialTextContent("div", "1")->Option.isSome,
).toBeTrue()
expect.bool(
container->DOM.findBySelectorAndPartialTextContent("div", "2")->Option.isSome,
).toBeTrue()
expect.bool(
container->DOM.findBySelectorAndPartialTextContent("div", "3")->Option.isSome,
).toBeTrue()
})
test("can clone an element", ({expect}) => {
let container = getContainer(container)
act(() =>
ReactDOM.render(
React.cloneElement(<div> {"Hello"->React.string} </div>, {"data-name": "World"}),
container,
)
)
expect.bool(
container
->DOM.findBySelectorAndPartialTextContent("div[data-name='World']", "Hello")
->Option.isSome,
).toBeTrue()
})
test("can render react components", ({expect}) => {
let container = getContainer(container)
act(() => ReactDOM.render(<DummyStatefulComponent />, container))
expect.bool(
container->DOM.findBySelectorAndTextContent("button", "0")->Option.isSome,
).toBeTrue()
let button = container->DOM.findBySelector("button")
act(() =>
switch button {
| Some(button) => Simulate.click(button)
| None => ()
}
)
expect.bool(
container->DOM.findBySelectorAndTextContent("button", "0")->Option.isSome,
).toBeFalse()
expect.bool(
container->DOM.findBySelectorAndTextContent("button", "1")->Option.isSome,
).toBeTrue()
})
test("can render react components with reducers", ({expect}) => {
let container = getContainer(container)
act(() => ReactDOM.render(<DummyReducerComponent />, container))
expect.bool(
container->DOM.findBySelectorAndTextContent(".value", "0")->Option.isSome,
).toBeTrue()
let button = container->DOM.findBySelectorAndPartialTextContent("button", "Increment")
act(() =>
switch button {
| Some(button) => Simulate.click(button)
| None => ()
}
)
expect.bool(
container->DOM.findBySelectorAndTextContent(".value", "0")->Option.isSome,
).toBeFalse()
expect.bool(
container->DOM.findBySelectorAndTextContent(".value", "1")->Option.isSome,
).toBeTrue()
let button = container->DOM.findBySelectorAndPartialTextContent("button", "Decrement")
act(() =>
switch button {
| Some(button) => Simulate.click(button)
| None => ()
}
)
expect.bool(
container->DOM.findBySelectorAndTextContent(".value", "0")->Option.isSome,
).toBeTrue()
expect.bool(
container->DOM.findBySelectorAndTextContent(".value", "1")->Option.isSome,
).toBeFalse()
})
test("can render react components with reducers (map state)", ({expect}) => {
let container = getContainer(container)
act(() => ReactDOM.render(<DummyReducerWithMapStateComponent />, container))
expect.bool(
container->DOM.findBySelectorAndTextContent(".value", "1")->Option.isSome,
).toBeTrue()
let button = container->DOM.findBySelectorAndPartialTextContent("button", "Increment")
act(() =>
switch button {
| Some(button) => Simulate.click(button)
| None => ()
}
)
expect.bool(
container->DOM.findBySelectorAndTextContent(".value", "1")->Option.isSome,
).toBeFalse()
expect.bool(
container->DOM.findBySelectorAndTextContent(".value", "2")->Option.isSome,
).toBeTrue()
let button = container->DOM.findBySelectorAndPartialTextContent("button", "Decrement")
act(() =>
switch button {
| Some(button) => Simulate.click(button)
| None => ()
}
)
expect.bool(
container->DOM.findBySelectorAndTextContent(".value", "1")->Option.isSome,
).toBeTrue()
expect.bool(
container->DOM.findBySelectorAndTextContent(".value", "2")->Option.isSome,
).toBeFalse()
})
test("can render react components with effects", ({expect}) => {
let container = getContainer(container)
let callback = Mock.fn()
act(() => ReactDOM.render(<DummyComponentWithEffect value=0 callback />, container))
act(() => ReactDOM.render(<DummyComponentWithEffect value=1 callback />, container))
act(() => ReactDOM.render(<DummyComponentWithEffect value=1 callback />, container))
expect.value(callback->Mock.getMock->Mock.calls).toEqual([[0], [1]])
})
test("can render react components with layout effects", ({expect}) => {
let container = getContainer(container)
let callback = Mock.fn()
act(() => ReactDOM.render(<DummyComponentWithLayoutEffect value=0 callback />, container))
act(() => ReactDOM.render(<DummyComponentWithLayoutEffect value=1 callback />, container))
act(() => ReactDOM.render(<DummyComponentWithLayoutEffect value=1 callback />, container))
expect.value(callback->Mock.getMock->Mock.calls).toEqual([[0], [1]])
})
test("can work with React refs", ({expect}) => {
let reactRef = React.createRef()
expect.value(reactRef.current).toEqual(Js.Nullable.null)
reactRef.current = Js.Nullable.return(1)
expect.value(reactRef.current).toEqual(Js.Nullable.return(1))
})
test("can work with useRef", ({expect}) => {
let container = getContainer(container)
let myRef = ref(None)
let callback = reactRef => myRef := Some(reactRef)
act(() => ReactDOM.render(<DummyComponentWithRefAndEffect callback />, container))
expect.value(myRef.contents->Option.map(item => item.current)).toEqual(Some(2))
})
test("Children", ({expect}) => {
let container = getContainer(container)
act(() =>
ReactDOM.render(
<DummyComponentThatMapsChildren>
<div> {1->React.int} </div> <div> {2->React.int} </div> <div> {3->React.int} </div>
</DummyComponentThatMapsChildren>,
container,
)
)
expect.bool(
container->DOM.findBySelectorAndPartialTextContent("div[data-index='0']", "1")->Option.isSome,
).toBeTrue()
expect.bool(
container->DOM.findBySelectorAndPartialTextContent("div[data-index='1']", "2")->Option.isSome,
).toBeTrue()
expect.bool(
container->DOM.findBySelectorAndPartialTextContent("div[data-index='2']", "3")->Option.isSome,
).toBeTrue()
})
test("Context", ({expect}) => {
let container = getContainer(container)
act(() =>
ReactDOM.render(
<DummyContext.Provider value=10> <DummyContext.Consumer /> </DummyContext.Provider>,
container,
)
)
expect.bool(
container->DOM.findBySelectorAndPartialTextContent("div", "10")->Option.isSome,
).toBeTrue()
})
test("Events", ({expect}) => {
let container = getContainer(container)
let value = ref("")
act(() =>
ReactDOM.render(
<input
name="test-input" onChange={event => value := (event->ReactEvent.Form.target)["value"]}
/>,
container,
)
)
switch container->DOM.findBySelector("input[name='test-input']") {
| Some(input) => input->Simulate.changeWithValue("My value")
| None => ()
}
expect.string(value.contents).toEqual("My value")
})
test("ErrorBoundary", ({expect}) => {
let container = getContainer(container)
// We need to disable error temporarily due to React always
// printing errors / warnings
let consoleFn = Console.disableError()
act(() =>
ReactDOM.render(
<RescriptReactErrorBoundary
fallback={({error, info}) => {
switch error {
| ComponentThatThrows.TestError => ()
| _ => Js.Exn.raiseError("TestError exn should have been captured by fallback")
}
Console.restoreError(consoleFn)
expect.bool(info.componentStack->Js.String2.includes("ComponentThatThrows")).toBeTrue()
<strong> {"An error occured"->React.string} </strong>
}}>
<ComponentThatThrows value=1 />
</RescriptReactErrorBoundary>,
container,
)
)
expect.bool(
container->DOM.findBySelectorAndTextContent("strong", "An error occured")->Option.isSome,
).toBeTrue()
})
})