C#: Add test for parameter modifiers.

csharp/ql/test/library-tests/parameters/ParameterModifiers.cs

@@ -0,0 +1,18 @@
+using System;
+
+public class ParameterModifiers
+{
+    public void M1(object p1) { }
+    public void M2(in object p2) { }
+
+    public void M3(out object p3)
+    {
+        p3 = new object();
+    }
+
+    public void M4(ref object p4) { }
+
+    public void M5(params object[] p5) { }
+
+    public void M6(ref readonly object p6) { }
+}

csharp/ql/test/library-tests/parameters/ParameterModifiers.expected

@@ -0,0 +1,18 @@
+parameterModifier
+| ParameterModifiers.cs:5:27:5:28 | p1 | 0 |
+| ParameterModifiers.cs:6:30:6:31 | p2 | 5 |
+| ParameterModifiers.cs:8:31:8:32 | p3 | 2 |
+| ParameterModifiers.cs:13:31:13:32 | p4 | 1 |
+| ParameterModifiers.cs:15:36:15:37 | p5 | 3 |
+| ParameterModifiers.cs:17:40:17:41 | p6 | 0 |
+parameterIsValue
+| ParameterModifiers.cs:5:27:5:28 | p1 |
+| ParameterModifiers.cs:17:40:17:41 | p6 |
+parameterIsIn
+| ParameterModifiers.cs:6:30:6:31 | p2 |
+parameterIsOut
+| ParameterModifiers.cs:8:31:8:32 | p3 |
+parameterIsRef
+| ParameterModifiers.cs:13:31:13:32 | p4 |
+parameterIsParams
+| ParameterModifiers.cs:15:36:15:37 | p5 |

csharp/ql/test/library-tests/parameters/ParameterModifiers.ql

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+import csharp
+
+class TestParameter extends Parameter {
+  TestParameter() { this.getFile().getBaseName() = "ParameterModifiers.cs" }
+}
+
+query predicate parameterModifier(TestParameter p, int kind) { params(p, _, _, _, kind, _, _) }
+
+query predicate parameterIsValue(TestParameter p) { p.isValue() }
+
+query predicate parameterIsIn(TestParameter p) { p.isIn() }
+
+query predicate parameterIsOut(TestParameter p) { p.isOut() }
+
+query predicate parameterIsRef(TestParameter p) { p.isRef() }
+
+query predicate parameterIsParams(TestParameter p) { p.isParams() }