public void Equals_ReturnsTrue_ForNullInstances()
{
// Arrange
var comparer = new DefaultObjectComparer <Person>();
// Act
bool equals = comparer.Equals(null, null);
// Assert
Assert.True(equals);
}
public void Compare_ReturnsZero_NullInstances()
{
// Arrange
var comparer = new DefaultObjectComparer <Person>();
// Act
var result = comparer.Compare(null, null);
// Assert
Assert.Equal(0, result);
}
public void Equals_ReturnsTrue_ForSameInstance()
{
// Arrange
var person = new Person();
var comparer = new DefaultObjectComparer <Person>();
// Act
bool equals = comparer.Equals(person, person);
// Assert
Assert.True(equals);
}
public void Compare_ReturnsZero_ForSameInstance()
{
// Arrange
var person = new Person();
var comparer = new DefaultObjectComparer <Person>();
// Act
var result = comparer.Compare(person, person);
// Assert
Assert.Equal(0, result);
}
public void Constructor_SetsProperties()
{
// Arrange
var person = new Person();
var comparer = new DefaultObjectComparer <Person>();
// Act
// Assert
Assert.NotEqual(0, comparer.HighValue);
Assert.NotEqual(0, comparer.LowValue);
}
public void Equals_ReturnsTrue_WhenNoPropertySelectorsProvided()
{
// Arrange
var person0 = new Person();
var person1 = new Person();
var comparer = new DefaultObjectComparer <Person>();
// Act
bool equals = comparer.Equals(person0, person1);
// Assert
Assert.True(equals);
}
public void Compare_ReturnsZero_WhenNoPropertySelectorsProvided()
{
// Arrange
var person0 = new Person();
var person1 = new Person();
var comparer = new DefaultObjectComparer <Person>();
// Act
var result = comparer.Compare(person0, person1);
// Assert
Assert.Equal(0, result);
}
public void Equals_ReturnsFalse_ForNullInstance()
{
// Arrange
var person = new Person();
var comparer = new DefaultObjectComparer <Person>();
// Act
bool equals0 = comparer.Equals(person, null);
bool equals1 = comparer.Equals(null, person);
// Assert
Assert.False(equals0);
Assert.False(equals1);
}
public void Compare_OrdersNullInstancesFirst()
{
// Arrange
var person = new Person();
// MA - Provide at least 1 property selector.
var comparer = new DefaultObjectComparer <Person>(p => p.Forename);
// Act
var result0 = comparer.Compare(null, person);
var result1 = comparer.Compare(person, null);
// Assert
Assert.Equal(-1, result0);
Assert.Equal(1, result1);
}
public void Compare_OrdersUsingPropertySelectors()
{
// Arrange
var person0 = new Person
{
Forename = "Matt",
Surname = "Abbott",
DateOfBirth = new DateTime(1984, 3, 11)
};
var person1 = new Person()
{
Forename = "Abbott",
Surname = "Matt",
DateOfBirth = new DateTime(1984, 11, 3)
};
var person2 = new Person
{
Forename = "Matthew",
Surname = "Abbott",
DateOfBirth = new DateTime(1984, 3, 11)
};
var comparer0 = new DefaultObjectComparer <Person>(
p => p.Forename,
p => p.Surname);
var comparer1 = new DefaultObjectComparer <Person>(
p => p.Surname,
p => p.Forename);
// Act
// MA - Matt > Abbott
int result0 = comparer0.Compare(person0, person1);
// MA - Matt < Matthew
int result1 = comparer0.Compare(person0, person2);
// MA - Abbott < Matt
int result2 = comparer1.Compare(person0, person1);
// MA - Abbott = Abbott, Matt < Matthew
int result3 = comparer0.Compare(person0, person2);
// Assert
Assert.True(result0 > 0);
Assert.True(result1 < 0);
Assert.True(result2 < 0);
Assert.True(result3 < 0);
}
public void Equals_UsesPropertySelectors()
{
// Arrange
var person0 = new Person()
{
Forename = "Matt",
Surname = "Abbott",
DateOfBirth = new DateTime(1984, 3, 11)
};
var person1 = new Person()
{
Forename = "Matt",
Surname = "Abbott",
DateOfBirth = new DateTime(1984, 3, 11)
};
var person2 = new Person()
{
Forename = "Matt",
Surname = "Abbott2",
DateOfBirth = new DateTime(1984, 3, 11)
};
var comparer0 = new DefaultObjectComparer <Person>
(
p => p.Forename,
p => p.Surname,
p => p.DateOfBirth
);
var comparer1 = new DefaultObjectComparer <Person>
(
p => p.Surname
);
// Act
bool equals0 = comparer0.Equals(person0, person1);
bool equals1 = comparer1.Equals(person0, person1);
bool equals2 = comparer1.Equals(person0, person2);
// Assert
Assert.True(equals0);
Assert.True(equals1);
Assert.False(equals2);
}
