add csharp tests

Author: Jami Cogswell

csharp/ql/test/query-tests/Telemetry/SupportedExternalApis/SupportedExternalApis.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using System.Web;
+
+public class SupportedExternalApis
+{
+    public void M1()
+    {
+        var l = new List<object>(); // Uninteresting parameterless constructor
+        var o = new object(); // Uninteresting parameterless constructor
+        l.Add(o); // Has flow summary
+        l.Add(o); // Has flow summary
+    }
+
+    public void M2()
+    {
+        var d0 = new DateTime(); // Uninteresting parameterless constructor
+        var next0 = d0.AddYears(30); // Has no flow summary, supported as negative summary
+
+        var d1 = new DateTime(2000, 1, 1); // Interesting constructor, supported as negative summary
+        var next1 = next0.AddDays(3); // Has no flow summary, supported as negative summary
+        var next2 = next1.AddYears(5); // Has no flow summary, supported as negative summary
+    }
+
+    public void M3()
+    {
+        var guid1 = Guid.Parse("{12345678-1234-1234-1234-123456789012}"); // Has no flow summary, supported as negative summary
+    }
+
+     public void M4()
+    {
+        var o = new object(); // Uninteresting parameterless constructor
+        var response = new HttpResponse(); // Uninteresting parameterless constructor
+        response.AddHeader("header", "value"); // Unsupported
+        response.AppendHeader("header", "value"); // Unsupported
+        response.Write(o); // Known sink
+        response.WriteFile("filename"); // Known sink
+        response.Write(o); // Known sink
+    }
+
+     public void M5()
+    {
+        var l1 = Console.ReadLine(); // Known source
+        var l2 = Console.ReadLine(); // Known source
+        Console.SetError(Console.Out); // Has no flow summary, supported as negative summary
+        var x = Console.Read(); // Known source
+    }
+}

csharp/ql/test/query-tests/Telemetry/SupportedExternalApis/SupportedExternalApis.expected

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+| System#Console.ReadLine() | 2 |
+| System#DateTime.AddYears(System.Int32) | 2 |
+| System.Collections.Generic#List<>.Add(T) | 2 |
+| System.Web#HttpResponse.Write(System.Object) | 2 |
+| System#Console.Read() | 1 |
+| System#Console.SetError(System.IO.TextWriter) | 1 |
+| System#Console.get_Out() | 1 |
+| System#DateTime.AddDays(System.Double) | 1 |
+| System#DateTime.DateTime(System.Int32,System.Int32,System.Int32) | 1 |
+| System#Guid.Parse(System.String) | 1 |
+| System.Web#HttpResponse.WriteFile(System.String) | 1 |

csharp/ql/test/query-tests/Telemetry/SupportedExternalApis/SupportedExternalApis.qlref

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+Telemetry/SupportedExternalApis.ql

csharp/ql/test/query-tests/Telemetry/SupportedExternalApis/options

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+semmle-extractor-options: /r:System.Collections.Specialized.dll
+semmle-extractor-options: ${testdir}/../../../resources/stubs/System.Web.cs