Add future tests for implicit auto, when it gets fully adopted in cling.

The adoption should be done soon.

test/Extensions/ImplicitAutoKeyword/Auto.C

@@ -0,0 +1,21 @@
+// RUN: cat %s | %cling --enable-implicit-auto-keyword | FileCheck %s
+// XFAIL: *
+
+// ROOT-5324
+b = 1
+//CHECK: (int) 1
+b += 1
+//CHECK: (int) 2
+b = 0
+//CHECK: (int) 0
+a = b
+//CHECK: (int) 0
+int c = a
+//CHECK: (int) 0
+// end ROOT-5324
+
+auto explicitAuto = "test";
+explicitAuto
+//CHECK: (const char*) "test"
+
+.q

test/Extensions/ImplicitAutoKeyword/AutoInitOrder.C

@@ -0,0 +1,15 @@
+// RUN: cat %s | %cling --enable-implicit-auto-keyword | FileCheck %s
+// XFAIL: *
+
+class MyClass {
+public:
+  int i;
+  MyClass(int a) : i(a) {};
+};
+
+MyClass* my1 = new MyClass(0); my1->i = 10; my2 = new MyClass(my1->i); my1->i++;
+my1->i
+//CHECK: (int) 11
+my2->i
+//CHECK: (int) 10
+.q