Rename the visitor and the test fixture.
Write a unit test that passes an Expression.GreaterThan (Expression.Call (Microsoft.VisualBasic.CompilerServices.Operators.CompareString, left, right, Expression.Constant (true))) to the visitor. The result should be a VBStringComparisonExpression whose comparison member is BinaryExpression.GreaterThan (left, right) and whose TextCompare member is true.
Implement that functionality in the visitor by overriding VisitBinaryExpression and checking whether the left side is a MethodCallExpression to above method. Compare by full names, do not add a reference to Microsoft.VisualBasic.dll to the Data.Linq project. (A reference in the unit test is okay.)
Enable Remotion.Data.IntegrationTests.VB.Linq.LinqSamples101.Parsing.WhereTest.Test_01. Check that the ToString representation is that of a VBCompareStringExpression.