public static void GetHashCode___Should_throw_NotSupportedException___When_constructed_with_null_getHashCodeFunc()
{
// Arrange
var systemUnderTest = new LambdaBackedEqualityComparer <string>((x, y) => x.First() == y.First(), getHashCodeFunc: null);
// Act
var actual = Record.Exception(() => systemUnderTest.GetHashCode("abc"));
// Assert
actual.Should().BeOfType <NotSupportedException>();
}
public static void GetHashCode___Should_use_getHashCodeFunc___When_called()
{
// Arrange
var hashCode = A.Dummy <int>();
var systemUnderTest = new LambdaBackedEqualityComparer <string>(
(x, y) => x.First() == y.First(),
obj => hashCode);
// Act
var actual = systemUnderTest.GetHashCode(A.Dummy <string>());
// Assert
actual.Should().Be(hashCode);
}