DisplayMessages
. render()
, faça o componente renderizar um elemento de input
, elemento de button
e elemento ul
. Quando o elemento de input
é alterado, ele deve acionar um método handleChange()
. Além disso, o elemento de input
deve renderizar o valor da input
que está no estado do componente. O elemento button
deve acionar um método submitMessage()
quando é clicado. Em segundo lugar, escreva esses dois métodos. O método handleChange()
deve atualizar a input
com o que o usuário está digitando. O método submitMessage()
deve concatenar a mensagem atual (armazenada na input
) para a matriz de messages
no estado local e limpar o valor da input
. Finalmente, use o ul
para mapear a matriz de messages
e renderizá-la na tela como uma lista de elementos li
. DisplayMessages
deve inicializar com um estado igual a { input: "", messages: [] }
.'
testString: 'assert((function() { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const initialState = mockedComponent.state(); return ( typeof initialState === "object" && initialState.input === "" && initialState.messages.length === 0); })(), "The DisplayMessages
component should initialize with a state equal to { input: "", messages: [] }
.");'
- text: 'O componente DisplayMessages
deve renderizar uma div
contendo um elemento h2
, um elemento button
, um elemento ul
e li
como filhos.'
testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const state = () => { mockedComponent.setState({messages: ["__TEST__MESSAGE"]}); return waitForIt(() => mockedComponent )}; const updated = await state(); assert(updated.find("div").length === 1 && updated.find("h2").length === 1 && updated.find("button").length === 1 && updated.find("ul").length === 1, "The DisplayMessages
component should render a div
containing an h2
element, a button
element, a ul
element, and li
elements as children."); }; '
- text: O elemento de input
deve renderizar o valor da input
no estado local.
testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const causeChange = (c, v) => c.find("input").simulate("change", { target: { value: v }}); const testValue = "__TEST__EVENT__INPUT"; const changed = () => { causeChange(mockedComponent, testValue); return waitForIt(() => mockedComponent )}; const updated = await changed(); assert(updated.find("input").props().value === testValue, "The input
element should render the value of input
in local state."); }; '
- text: Chamar o método handleChange
deve atualizar o valor de input
em estado para a entrada atual.
testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const causeChange = (c, v) => c.find("input").simulate("change", { target: { value: v }}); const initialState = mockedComponent.state(); const testMessage = "__TEST__EVENT__MESSAGE__"; const changed = () => { causeChange(mockedComponent, testMessage); return waitForIt(() => mockedComponent )}; const afterInput = await changed(); assert(initialState.input === "" && afterInput.state().input === "__TEST__EVENT__MESSAGE__", "Calling the method handleChange
should update the input
value in state to the current input."); }; '
- text: Clicar no botão Add message
deve chamar o método submitMessage
que deve adicionar a input
atual ao array de messages
no estado.
testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const causeChange = (c, v) => c.find("input").simulate("change", { target: { value: v }}); const initialState = mockedComponent.state(); const testMessage_1 = "__FIRST__MESSAGE__"; const firstChange = () => { causeChange(mockedComponent, testMessage_1); return waitForIt(() => mockedComponent )}; const firstResult = await firstChange(); const firstSubmit = () => { mockedComponent.find("button").simulate("click"); return waitForIt(() => mockedComponent )}; const afterSubmit_1 = await firstSubmit(); const submitState_1 = afterSubmit_1.state(); const testMessage_2 = "__SECOND__MESSAGE__"; const secondChange = () => { causeChange(mockedComponent, testMessage_2); return waitForIt(() => mockedComponent )}; const secondResult = await secondChange(); const secondSubmit = () => { mockedComponent.find("button").simulate("click"); return waitForIt(() => mockedComponent )}; const afterSubmit_2 = await secondSubmit(); const submitState_2 = afterSubmit_2.state(); assert(initialState.messages.length === 0 && submitState_1.messages.length === 1 && submitState_2.messages.length === 2 && submitState_2.messages[1] === testMessage_2, "Clicking the Add message
button should call the method submitMessage
which should add the current input
to the messages
array in state."); }; '
- text: O método submitMessage
deve limpar a entrada atual.
testString: 'async () => { const mockedComponent = Enzyme.mount(React.createElement(DisplayMessages)); const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 100)); const causeChange = (c, v) => c.find("input").simulate("change", { target: { value: v }}); const initialState = mockedComponent.state(); const testMessage = "__FIRST__MESSAGE__"; const firstChange = () => { causeChange(mockedComponent, testMessage); return waitForIt(() => mockedComponent )}; const firstResult = await firstChange(); const firstState = firstResult.state(); const firstSubmit = () => { mockedComponent.find("button").simulate("click"); return waitForIt(() => mockedComponent )}; const afterSubmit = await firstSubmit(); const submitState = afterSubmit.state(); assert(firstState.input === testMessage && submitState.input === "", "The submitMessage
method should clear the current input."); }; '
```