clone SchemaStack during testing

This alters the testing mechanism to clone the schema stack inbetween
test runs.  The purpose of this is to ensure that each test is run with
a fresh stack to protect against any unexpected aliasing issues.

However, at this time, it fails because various components need to be
registered with relevant interfaces.

Author: DavePearce

pkg/asm/program.go

@@ -25,6 +25,7 @@ import (
 	"github.com/consensys/go-corset/pkg/util/collection/array"
 	"github.com/consensys/go-corset/pkg/util/collection/iter"
 	"github.com/consensys/go-corset/pkg/util/field"
+	"github.com/consensys/go-corset/pkg/util/word"
 )
 
 // MixedProgram represents the composition of an assembly program along with
@@ -189,4 +190,6 @@ func (p *MixedProgram[F, T, M]) GobDecode(data []byte) error {
 
 func init() {
 	gob.Register(MacroComponent(&MacroFunction{}))
+	gob.Register(schema.AnySchema[word.BigEndian](&MacroHirProgram{}))
+	gob.Register(schema.AnySchema[word.BigEndian](&MicroHirProgram{}))
 }

pkg/test/util/check_valid.go

@@ -228,6 +228,8 @@ func checkTraces[F field.Element[F]](t *testing.T, test string, maxPadding uint,
 		t.Run(test, func(t *testing.T) {
 			// Enable parallel testing
 			t.Parallel()
+			// Clone localStack to ensure complete separation between tests.
+			localStack := stack.Clone()
 			//
 			for _, ir := range []string{"MIR", "AIR"} {
 				for i, tf := range traces {
@@ -239,13 +241,13 @@ func checkTraces[F field.Element[F]](t *testing.T, test string, maxPadding uint,
 					//
 					if tf.RawModules() != nil {
 						// Construct trace identifier
-						id := traceId{stack.RegisterMapping().Field().Name, ir, test,
+						id := traceId{localStack.RegisterMapping().Field().Name, ir, test,
 							cfg.expected, cfg.expand, cfg.validate, opt, parallel, i + 1, padding}
 						//
 						if cfg.expand || ir == "AIR" {
 							// Always check if expansion required, otherwise
 							// only check AIR constraints.
-							checkTrace(t, tf, id, stack.ConcreteSchemaOf(ir), stack.RegisterMapping())
+							checkTrace(t, tf, id, localStack.ConcreteSchemaOf(ir), localStack.RegisterMapping())
 						}
 					}
 				}