public async Task ParameterTest_ComputeCurrentParameter01()
{
var textBuffer = new TextBufferMock("aov(", RContentTypeDefinition.ContentType);
var editorBuffer = textBuffer.ToEditorBuffer();
var source = new RSignatureHelpSource(textBuffer, Services);
var session = new SignatureHelpSessionMock(Services, textBuffer, 0);
var textView = session.TextView as TextViewMock;
var signatures = new List <ISignature>();
using (var tree = new EditorTree(editorBuffer, Services)) {
tree.Build();
using (var document = new EditorDocumentMock(tree)) {
session.TrackingPoint = new TrackingPointMock(textBuffer, 4, PointTrackingMode.Positive, TrackingFidelityMode.Forward);
await FunctionIndex.GetPackageNameAsync("aov");
tree.TakeThreadOwnerShip();
await source.AugmentSignatureHelpSessionAsync(session, signatures, tree.AstRoot);
signatures.Should().ContainSingle();
var index = GetCurrentParameterIndex(signatures[0], signatures[0].CurrentParameter);
index.Should().Be(0);
textView.Caret = new TextCaretMock(textView, 5);
TextBufferUtility.ApplyTextChange(textBuffer, 4, 0, 1, "a");
index = GetCurrentParameterIndex(signatures[0], signatures[0].CurrentParameter);
index.Should().Be(0);
textView.Caret = new TextCaretMock(textView, 6);
TextBufferUtility.ApplyTextChange(textBuffer, 5, 0, 1, ",");
tree.EnsureTreeReady();
index = GetCurrentParameterIndex(signatures[0], signatures[0].CurrentParameter);
index.Should().Be(1);
textView.Caret = new TextCaretMock(textView, 7);
TextBufferUtility.ApplyTextChange(textBuffer, 6, 0, 1, ",");
tree.EnsureTreeReady();
index = GetCurrentParameterIndex(signatures[0], signatures[0].CurrentParameter);
index.Should().Be(2);
}
}
}