' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
 
Imports System.Threading
Imports Microsoft.CodeAnalysis
Imports Microsoft.CodeAnalysis.Completion
Imports Microsoft.CodeAnalysis.Options
Imports Microsoft.CodeAnalysis.Text
 
Namespace Microsoft.VisualStudio.LanguageServices.UnitTests.Completion
    Friend MustInherit Class MockCompletionProvider
        Inherits CommonCompletionProvider
 
        Public Overrides Function ProvideCompletionsAsync(context As CompletionContext) As Task
            Dim item = CommonCompletionItem.Create("DisplayText", "", rules:=CompletionItemRules.Default)
            context.AddItem(item)
 
            Return Task.CompletedTask
        End Function
 
        Public Overrides Function IsInsertionTrigger(text As SourceText, characterPosition As Integer, options As CompletionOptions) As Boolean
            Return True
        End Function
 
        Public Overrides Function GetTextChangeAsync(document As Document, selectedItem As CompletionItem, ch As Char?, cancellationToken As CancellationToken) As Task(Of TextChange?)
            Return Task.FromResult(Of TextChange?)(New TextChange(selectedItem.Span, "InsertionText"))
        End Function
    End Class
End Namespace