public void MoveTo_ViewBuffer_TakesPage_IfCurrentPageDoesNotHaveCapacity()
{
// Arrange
var scope = new TestViewBufferScope();
var original = new ViewBuffer(scope, "original", pageSize: 4);
var other = new ViewBuffer(scope, "other", pageSize: 4);
for (var i = 0; i < 3; i++)
{
original.AppendHtml($"original-{i}");
}
// With two items, we'd try to copy the items, but there's no room in the current page.
// So we just take over the page.
for (var i = 0; i < 2; i++)
{
other.AppendHtml($"other-{i}");
}
var page = other[0];
// Act
other.MoveTo(original);
// Assert
Assert.Equal(0, other.Count); // Page was taken
Assert.Equal(2, original.Count);
Assert.Same(page, original[1]);
}
public void MoveTo_ViewBuffer_TakesPage_IfCurrentPageInOriginalIsFull()
{
// Arrange
var scope = new TestViewBufferScope();
var original = new ViewBuffer(scope, "original", pageSize: 4);
var other = new ViewBuffer(scope, "other", pageSize: 4);
for (var i = 0; i < 4; i++)
{
original.AppendHtml($"original-{i}");
}
other.AppendHtml("Hi");
var page = other[0];
// Act
other.MoveTo(original);
// Assert
Assert.Equal(0, other.Count); // Page was taken
Assert.Equal(2, original.Count);
Assert.Same(page, original[1]);
}
public void MoveTo_ViewBuffer_MultiplePages()
{
// Arrange
var scope = new TestViewBufferScope();
var original = new ViewBuffer(scope, "original", pageSize: 4);
var other = new ViewBuffer(scope, "other", pageSize: 4);
for (var i = 0; i < 2; i++)
{
original.AppendHtml($"original-{i}");
}
for (var i = 0; i < 9; i++)
{
other.AppendHtml($"other-{i}");
}
var pages = new List <ViewBufferPage>();
for (var i = 0; i < other.Count; i++)
{
pages.Add(other[i]);
}
// Act
other.MoveTo(original);
// Assert
Assert.Equal(0, other.Count); // Other is cleared
Assert.Equal(4, original.Count);
Assert.Collection(
original[0].Buffer,
item => Assert.Equal("original-0", item.Value),
item => Assert.Equal("original-1", item.Value),
item => Assert.Null(item.Value),
item => Assert.Null(item.Value));
Assert.Collection(
original[1].Buffer,
item => Assert.Equal("other-0", item.Value),
item => Assert.Equal("other-1", item.Value),
item => Assert.Equal("other-2", item.Value),
item => Assert.Equal("other-3", item.Value));
Assert.Collection(
original[2].Buffer,
item => Assert.Equal("other-4", item.Value),
item => Assert.Equal("other-5", item.Value),
item => Assert.Equal("other-6", item.Value),
item => Assert.Equal("other-7", item.Value));
Assert.Collection(
original[3].Buffer,
item => Assert.Equal("other-8", item.Value),
item => Assert.Null(item.Value),
item => Assert.Null(item.Value),
item => Assert.Null(item.Value));
}
public void MoveTo_ViewBuffer_CanAddToTakenPage()
{
// Arrange
var scope = new TestViewBufferScope();
var original = new ViewBuffer(scope, "original", pageSize: 4);
var other = new ViewBuffer(scope, "other", pageSize: 4);
for (var i = 0; i < 3; i++)
{
original.AppendHtml($"original-{i}");
}
// More than half full, so we take the page
for (var i = 0; i < 3; i++)
{
other.AppendHtml($"other-{i}");
}
var page = other[0];
other.MoveTo(original);
// Act
original.AppendHtml("after-merge");
// Assert
Assert.Equal(0, other.Count); // Other is cleared
Assert.Equal(2, original.Count);
Assert.Collection(
original[0].Buffer,
item => Assert.Equal("original-0", item.Value),
item => Assert.Equal("original-1", item.Value),
item => Assert.Equal("original-2", item.Value),
item => Assert.Null(item.Value));
Assert.Collection(
original[1].Buffer,
item => Assert.Equal("other-0", item.Value),
item => Assert.Equal("other-1", item.Value),
item => Assert.Equal("other-2", item.Value),
item => Assert.Equal("after-merge", item.Value));
}
public void MoveTo_ViewBuffer_TakesPage_IfOriginalIsEmpty()
{
// Arrange
var scope = new TestViewBufferScope();
var original = new ViewBuffer(scope, "original", pageSize: 4);
var other = new ViewBuffer(scope, "other", pageSize: 4);
other.AppendHtml("Hi");
var page = other[0];
// Act
other.MoveTo(original);
// Assert
Assert.Equal(0, other.Count); // Page was taken
Assert.Equal(1, original.Count);
Assert.Same(page, original[0]);
}
public void MoveTo_ViewBuffer_CopiesItems_IfCurrentPageHasRoom()
{
// Arrange
var scope = new TestViewBufferScope();
var original = new ViewBuffer(scope, "original", pageSize: 4);
var other = new ViewBuffer(scope, "other", pageSize: 4);
for (var i = 0; i < 2; i++)
{
original.AppendHtml($"original-{i}");
}
// With two items, this is half full so we try to copy the items.
for (var i = 0; i < 2; i++)
{
other.AppendHtml($"other-{i}");
}
var page = other[0];
// Act
other.MoveTo(original);
// Assert
Assert.Equal(0, other.Count); // Other is cleared
Assert.Contains(page.Buffer, scope.ReturnedBuffers); // Buffer was returned
Assert.Equal(1, original.Count);
Assert.Collection(
original[0].Buffer,
item => Assert.Equal("original-0", item.Value),
item => Assert.Equal("original-1", item.Value),
item => Assert.Equal("other-0", item.Value),
item => Assert.Equal("other-1", item.Value));
}