IntegrationTestResults constructor Null safety

1. Flutter
2. common
3. IntegrationTestResults
4. IntegrationTestResults constructor

IntegrationTestResults class

1. Constructors
2. IntegrationTestResults
3. Properties
4. allTestsPassed
5. failureMethodsDetails
6. hashCode
7. reportData
8. runtimeType
9. Methods
10. noSuchMethod
11. toString
12. Operators
13. operator ==