objection-table-name/test/table-name.spec.js

const { Model } = require('objection')
const TableNamer = require('../')

function getTableNameFromClass (cls) {
  return cls.tableName
}

function upperFirst ([c, ...rest]) {
  return [c.toUpperCase(), ...rest].join('')
}

function overrideClassName (cls, name) {
  Object.defineProperty(cls, 'name', { value: name })
}

describe('table name from class name', () => {
  describe('when using defaults', () => {
    it("should resolve 'tablename' with camelCase and plural", () => {
      class BaseModel extends TableNamer()(Model) {}
      const testClass = {
        Foo: 'foos',
        FooBar: 'fooBars',
        fooBar: 'fooBars',
        Person: 'people'
      }
      class TestModel extends BaseModel {}
      Object.entries(testClass).forEach(([className, tableName]) => {
        overrideClassName(TestModel, className)
        expect(getTableNameFromClass(TestModel)).toStrictEqual(tableName)
      })
    })
  })

  describe('when using customs', () => {
    it("should resolve 'tableName'", () => {
      const mock = jest.fn(className => upperFirst(className))
      class BaseModel extends TableNamer({
        caseMapper: mock
      })(Model) {}
      const testClass = {
        foo_bar: 'Foo_bar',
        fooBar: 'FooBar'
      }
      class TestModel extends BaseModel {}
      Object.entries(testClass).forEach(([className, tableName]) => {
        overrideClassName(TestModel, className)
        expect(getTableNameFromClass(TestModel)).toStrictEqual(tableName)
        expect(mock).toHaveBeenCalledWith(className)
      })
    })
  })
})