Summary of all failing tests
 FAIL  tests/rules/prefer-readonly.test.ts (7.204 s, 224 MB heap size)
  ● prefer-readonly › invalid › 
        class Test {
          private prop: number = 3;
        
          test() {
            const that = {} as this & { _foo: 'bar' };
            that._foo = 1;
          }
        }
      
    assert.strictEqual(received, expected)
    Expected value to strictly be equal to:
      "
            class Test {
              private readonly prop: number = 3·
              test() {
                const that = {} as this & {_foo: 'bar'}
                that._foo = 1
              }
            }
          "
    Received:
      "
            class Test {
              private readonly prop: number = 3;·········
        
          constructor() {
            const that = {} as this & { _foo: 'bar' };
            that.prop = 1;
          }
        }
      
    assert.strictEqual(received, expected)
    Expected value to strictly be equal to:
      "
            class Test {
              private readonly prop: number·
              constructor() {
                const that = {} as this & {_foo: 'bar'}
                that.prop = 1
              }
            }
          "
    Received:
      "
            class Test {
              private readonly prop: number;·········
              constructor() {
                const that = {} as this & { _foo: 'bar' };
                that.prop = 1;
              }
            }
          "
    
    Message:
      Output is incorrect.
    Difference:
    - Expected
    + Received
              class Test {
    -           private readonly prop: number
    -
    +           private readonly prop: number;
    +         
                constructor() {
    -             const that = {} as this & {_foo: 'bar'}
    -             that.prop = 1
    +             const that = {} as this & { _foo: 'bar' };
    +             that.prop = 1;
                }
              }
            

      634 |         }
      635 |         else {
    > 636 |             node_assert_1.default.strictEqual(result.output, item.output, 'Output is incorrect.');
          |                                   ^
      637 |         }
      638 |     }
      639 |     else {

      at RuleTester.strictEqual (../rule-tester/dist/RuleTester.js:636:35)
      at Object.call (../rule-tester/dist/RuleTester.js:237:119)