前端技術之：如何Mock GraphQL接口數據

// 第一步：引入所依賴的庫

const { makeExecutableSchema, addMockFunctionsToSchema } = require('graphql-tools');
const { graphql } = require('graphql');

// 第二步：定義GraphQL Schema

const schemaString = `
  type User {
    id: ID,
    name: String,
    age: Int,
    address: String
  }
  type Query {
    user: User
  }
`;

// 樣例數據

const user = { id: 1, name: 'zhang' };

// 第三步：定義Resolver

const resolvers = {
  Query: {
    user: () => user
  }
};

// 第四步：調用makeExecutableSchema函數生成Schema對象

const schema = makeExecutableSchema({ typeDefs: schemaString, resolvers });

// 第五步：也是重要的一步，調用addMockFunctionsToSchema函數mock Schema

addMockFunctionsToSchema({
  schema,
  mocks: {
    Int: () => 6,
    Float: () => 22.1,
    String: () => 'Hello'
  }
});

// 第六步：也是最後一步，查詢並驗證結果

const query = `
query tasksForUser {
  user {
    id,
    name,
    age,
    address
  }
}
`;
graphql(schema, query).then(result => console.log('Got result', result));

// 參考資料網址： https://www.apollographql.com/docs/graphql-tools/mocking/