More stringent test; Fix indentation (of the code itself, not in the generator)

tests/dotnet/CSharp/CSharp.Tests.cs

@@ -1999,7 +1999,8 @@ public unsafe class CSharpTests
     [Test]
     public void TestValueTypeOutParameter()
     {
-	    CSharp.CSharp.ValueTypeOutParameter(out var unionTest);
-	    Assert.AreEqual(2, unionTest.A);
+        CSharp.CSharp.ValueTypeOutParameter(out var unionTestA, out var unionTestB);
+        Assert.AreEqual(2, unionTestA.A);
+        Assert.AreEqual(2, unionTestB.B);
     }
 }

tests/dotnet/CSharp/CSharp.cpp

@@ -1792,7 +1792,8 @@ bool PointerTester::IsValid()
 
 PointerTester* PointerToClass = &internalPointerTesterInstance;
 
-void ValueTypeOutParameter(UnionTester* tester)
+void ValueTypeOutParameter(UnionTester* testerA, UnionTester* testerB)
 {
-    tester->a = 2;
+    testerA->a = 2;
+    testerB->b = 2;
 }

tests/dotnet/CSharp/CSharp.h

@@ -1609,4 +1609,4 @@ union DLL_API UnionTester {
     int b;
 };
 
-void DLL_API ValueTypeOutParameter(CS_OUT UnionTester* tester);
+void DLL_API ValueTypeOutParameter(CS_OUT UnionTester* testerA, CS_OUT UnionTester* testerB);