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if (totalAmount > 1000) {
  totalAmount = totalAmount * 0.95;
}

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const errorMessage = error.details.map(({ message, context }) =>
  Object.assign({ message, context })
);

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// API route to create an order
app.post("/orders", async (req, res) => {
  // HTTP request payload validation
  // abortEarly is false in order to retrieve all the errors at once
  const { error } = Joi.validate(req.body, orderSchema, {
    abortEarly: false
  });

  if (error) {
    const errorMessage = error.details.map(({ message, context }) =>

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app.post("/products", async (req, res) => {
  const { error } = Joi.validate(req.body, productSchema, { abortEarly: false });
  
  if (error) {
    const errorMessage = error.details.map(({ message, context }) =>
      Object.assign({ message, context })
    );
    return res.status(400).send({ data: errorMessage });
  }
  

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it("returns the product location", async () => {
  const data = { name: "tshirt", price: 20, weight: 0.1 };
  const { headers } = await queryApi("POST", "/products", {body: data});
  expect(headers.location).to.match(/products\/.+/);
});

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app.post("/products", async (req, res) => {
  const { error } = Joi.validate(req.body, productSchema, { abortEarly: false });
  
  if (error) {
    const errorMessage = error.details.map(({ message, context }) =>
      Object.assign({ message, context })
    );
    return res.status(400).send({ data: errorMessage });
  }
  

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it("returns 201", async () => {
  const product = { name: "tshirt", price: 20, weight: 0.1 };
  const { statusCode } = await queryApi("POST", "/products", {body: data});
  expect(statusCode).to.equal(201);
});

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const productSchema = Joi.object().keys({
  name: Joi.required(),
  price: Joi.required(),
  weight: Joi.required()
});

// …

app.post("/products", async (req, res) => {
  const { error } = Joi.validate(req.body, productSchema, { abortEarly: false });

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it("returns the keys in error", async () => {
  const { body, statusCode } = await queryApi("POST", "/products", { body: {} });
  const contextList = body.data.map(item => item.context.key);
  expect(statusCode).to.equal(400);
  expect(contextList).to.contain("name", "price", "weight");
});

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app.post("/products", async (req, res) => {
  if (Object.keys(req.body).length === 0) {
    return res.status(400).send();
  }
});