Shared-State Corruption

Definition:

• Tests sharing in-memory state without rolling back

Code Example:

public class SharedStateCorruption
{
  // shared person state
  Person person = new Person();

  public void CreateAnalyzer_GooFileName_ReturnsTrue()
  {
    // changes shared state
    person.AddNumber("055-4556684(34)");
    string found = person.FindPhoneStartingWith("055");
    Assert.AreEqual("055-4556684(34"), found)
  }

  public void FindPhoneStartingWith_NoNumbers_ReturnNull()
  {
    // reads shared state
    string found = person.FindPhoneStartingWith("0");
    Assert.IsNull(found);
  }
}

References:

Quality attributes

• - Code Example

• - Cause and Effect

• - Frequency

• - Refactoring

• Chapter 8. The pillars of good unit tests