Add tests for INT48 CONST support

* Add TOSA test coverage
* Add some basic error checking

Signed-off-by: Luke Hutton <luke.hutton@arm.com>
Change-Id: Ib02df7319954a2dcb915e5f5a70699ca398fd483
diff --git a/verif/generator/tosa_test_gen.py b/verif/generator/tosa_test_gen.py
index 2b762aa..b48810f 100644
--- a/verif/generator/tosa_test_gen.py
+++ b/verif/generator/tosa_test_gen.py
@@ -3762,7 +3762,13 @@
                 TosaTensorValuesGen.tvgDefault,
                 None,
             ),
-            "types": TYPE_FIB,
+            "types": TYPE_FIB + [DType.INT48],
+            "error_if_validators": (
+                TosaErrorValidator.evWrongInputType,
+                TosaErrorValidator.evWrongOutputType,
+                TosaErrorValidator.evWrongInputList,
+                TosaErrorValidator.evWrongOutputList,
+            ),
         },
         "identity": {
             "op": Op.IDENTITY,