Polaroider

Automated Snapshottesting made simple

Simplify UnitTesting with snapshots.
Polaroider is a Approval Testing Framework that creates and compares snapshots of almost anything

Common, timeconsuming assertion testing

Conventional assertion testing needs multiple assertion checks to test and verify all properties of an object.
The tests have to be updated every time a new property is added.

// arrange
var repository = new PersonRepository();

// act
var person = repository.LoadTestPerson(...);

// assert
Assert.IsEqual(person.Firstname, "John");
Assert.IsEqual(person.Lastname, "Doe");
Assert.IsEqual(person.Company, "Polaroider");
Assert.IsEqual(person.Address.Street, "Teststreet");
Assert.IsEqual(person.Address.Streetnumber, 3);

Fast and easy approval testing with Polaroider

Polaroider reduces all assertions to just one single call.
Snapshottesting keeps the code simple, clean and readable.

// arrange
var repository = new PersonRepository();

// act
var person = repository.LoadTestPerson(...);

// assert
person.MatchSnapshot();

• GitHub
• Changelog

Update from v1 to v2

v1 was focused on simplicity. v2 is focused on flexibility while maintaining simplicity.

There are some breaking changes when updating to v2.

Mapping of simple types

• DateTimes are mapped in the ISO 8601 format to be Culture-Independent
• Null strings are now displayed as null
• Empty strings are now displayed as ‘’

Before updating to v2 ensure that all tests are executed without errors. If some tests throw a MismatchException there are two possibilities:

• Update the snapshots with the UpdateSnapshot Attribute
• Set the UseBasicFormatters on the SnapshotOptions. This resets all Formatters to the same as were used in v1

  SnapshotOptions.Setup(o =>
  {
    o.UseBasicFormatters();
  });