Created separate tests directory for D1.

tests/d1/minicomplex/constructors.d

@@ -0,0 +1,31 @@
+module constructors;
+
+import tango.io.Console;
+
+class C
+{
+    this()
+    {
+        Cout("C()").newline;
+    }
+    this(char[] str)
+    {
+        Cout("C(")(str)(")").newline;
+    }
+}
+
+class D : C
+{
+    this()
+    {
+        super("D");
+        Cout("D()").newline;
+    }
+}
+
+void main()
+{
+    auto c1 = new C();
+    auto c2 = new C("C");
+    auto d = new D();
+}