explicit-function-return-type.test.ts

import rule from '../../src/rules/explicit-function-return-type';
import { RuleTester } from '../RuleTester';

const ruleTester = new RuleTester({
  parser: '@typescript-eslint/parser'
});

ruleTester.run('explicit-function-return-type', rule, {
  valid: [
    {
      filename: 'test.ts',
      code: `
function test(): void {
    return;
}
            `
    },
    {
      filename: 'test.ts',
      code: `
var fn = function(): number {
    return 1;
};
            `
    },
    {
      filename: 'test.ts',
      code: `
var arrowFn = (): string => 'test';
            `
    },
    {
      filename: 'test.ts',
      code: `
var arrowFn: Foo = () => 'test';
            `
    },
    {
      filename: 'test.ts',
      code: `
class Test {
  constructor() {}
  get prop(): number {
    return 1;
  }
  set prop() {}
  method(): void {
    return;
  }
}
            `
    },
    {
      filename: 'test.js',
      code: `
function test() {
    return;
}
            `
    },
    {
      code: `fn(() => {});`,
      options: [
        {
          allowExpressions: true
        }
      ]
    },
    {
      code: `fn(function() {});`,
      options: [
        {
          allowExpressions: true
        }
      ]
    },
    {
      code: `[function() {}, () => {}]`,
      options: [
        {
          allowExpressions: true
        }
      ]
    },
    {
      code: `(function() {});`,
      options: [
        {
          allowExpressions: true
        }
      ]
    },
    {
      code: `(() => {})();`,
      options: [
        {
          allowExpressions: true
        }
      ]
    }
  ],
  invalid: [
    {
      filename: 'test.ts',
      code: `
function test() {
    return;
}
            `,
      errors: [
        {
          messageId: 'missingReturnType',
          line: 2,
          column: 1
        }
      ]
    },
    {
      filename: 'test.ts',
      code: `
var fn = function() {
    return 1;
};
            `,
      errors: [
        {
          messageId: 'missingReturnType',
          line: 2,
          column: 10
        }
      ]
    },
    {
      filename: 'test.ts',
      code: `
var arrowFn = () => 'test';
            `,
      errors: [
        {
          messageId: 'missingReturnType',
          line: 2,
          column: 15
        }
      ]
    },
    {
      filename: 'test.ts',
      code: `
class Test {
  constructor() {}
  get prop() {
      return 1;
  }
  set prop() {}
  method() {
    return;
  }
}
            `,
      errors: [
        {
          messageId: 'missingReturnType',
          line: 4,
          column: 11
        },
        {
          messageId: 'missingReturnType',
          line: 8,
          column: 9
        }
      ]
    },
    {
      filename: 'test.ts',
      code: `const foo = () => {};`,
      options: [{ allowExpressions: true }],
      errors: [
        {
          messageId: 'missingReturnType',
          line: 1,
          column: 13
        }
      ]
    },
    {
      filename: 'test.ts',
      code: `const foo = function() {};`,
      options: [{ allowExpressions: true }],
      errors: [
        {
          messageId: 'missingReturnType',
          line: 1,
          column: 13
        }
      ]
    }
  ]
});