EDMIService: Rework NewFile and SetAttributeValue

EDMIService.Tests/UnitTest1.vb

@@ -0,0 +1,9 @@
+Imports System.Text
+Imports Microsoft.VisualStudio.TestTools.UnitTesting
+
+<TestClass()> Public Class UnitTest1
+
+    <TestMethod()> Public Sub TestMethod1()
+    End Sub
+
+End Class