public void Enumerator_ThrowsExcetion_ForMissingDependencies()
{
// Arrange
var source = new[]
{
new Item {
Key = "One", Dependencies = null
},
new Item {
Key = "Two", Dependencies = new[] { "Three", "Four" }
},
new Item {
Key = "Three", Dependencies = new[] { "One" }
},
new Item {
Key = "Four", Dependencies = new[] { "Five" }
}
};
var enumerable = new DependencyKeyOrderedEnumerable <Item, string>(source, i => i.Key, (i, k) => i.Dependencies);
// Act
// Assert
var ioe = Assert.Throws <InvalidOperationException>(() => enumerable.ToList());
Assert.Equal("Missing dependency: 'Two => Four => Five?'", ioe.Message);
}
public void Enumerator_CreatesDependencySortedSet()
{
// Arrange
var source = new[]
{
new Item {
Key = "One", Dependencies = null
},
new Item {
Key = "Two", Dependencies = new[] { "Three", "Four" }
},
new Item {
Key = "Three", Dependencies = new[] { "One" }
},
new Item {
Key = "Four", Dependencies = null
}
};
var enumerable = new DependencyKeyOrderedEnumerable <Item, string>(source, i => i.Key, (i, k) => i.Dependencies);
// Act
var sorted = enumerable.ToList();
// Assert
Assert.Equal(4, sorted.Count);
Assert.Same(source[0], sorted[0]);
Assert.Same(source[2], sorted[1]);
Assert.Same(source[3], sorted[2]);
Assert.Same(source[1], sorted[3]);
}
