pam-moduler: Add test that generates a new debug module and verify it works

We mimic what pam_debug.so does by default, by implementing a similar
module fully in go, generated using pam-moduler.

This requires various utilities to generate the module and run the tests
that are in a separate internal modules so that it can be shared between
multiple implementations

cmd/pam-moduler/tests/internal/utils/base-module_test.go

@@ -0,0 +1,35 @@
+package utils
+
+import (
+	"testing"
+
+	"github.com/msteinert/pam/v2"
+)
+
+func TestMain(t *testing.T) {
+	bm := BaseModule{}
+
+	if bm.AcctMgmt(nil, pam.Flags(0), nil) != nil {
+		t.Fatalf("Unexpected non-nil value")
+	}
+
+	if bm.Authenticate(nil, pam.Flags(0), nil) != nil {
+		t.Fatalf("Unexpected non-nil value")
+	}
+
+	if bm.ChangeAuthTok(nil, pam.Flags(0), nil) != nil {
+		t.Fatalf("Unexpected non-nil value")
+	}
+
+	if bm.OpenSession(nil, pam.Flags(0), nil) != nil {
+		t.Fatalf("Unexpected non-nil value")
+	}
+
+	if bm.CloseSession(nil, pam.Flags(0), nil) != nil {
+		t.Fatalf("Unexpected non-nil value")
+	}
+
+	if bm.SetCred(nil, pam.Flags(0), nil) != nil {
+		t.Fatalf("Unexpected non-nil value")
+	}
+}