create mock chains.Manager and use it in tests

chains/mock_manager.go

@@ -0,0 +1,37 @@
+package chains
+
+import (
+	"github.com/ava-labs/gecko/ids"
+	"github.com/ava-labs/gecko/snow/networking/router"
+)
+
+// MockManager implements Manager but does nothing. Always returns nil error.
+// To be used only in tests (namely in package platformvm)
+type MockManager struct{}
+
+// Router ...
+func (mm MockManager) Router() router.Router { return nil }
+
+// CreateChain ...
+func (mm MockManager) CreateChain(ChainParameters) {}
+
+// ForceCreateChain ...
+func (mm MockManager) ForceCreateChain(ChainParameters) {}
+
+// AddRegistrant ...
+func (mm MockManager) AddRegistrant(Registrant) {}
+
+// Lookup ...
+func (mm MockManager) Lookup(string) (ids.ID, error) { return ids.ID{}, nil }
+
+// LookupVM ...
+func (mm MockManager) LookupVM(string) (ids.ID, error) { return ids.ID{}, nil }
+
+// Aliases ...
+func (mm MockManager) Aliases(ids.ID) []string { return nil }
+
+// Alias ...
+func (mm MockManager) Alias(ids.ID, string) error { return nil }
+
+// Shutdown ...
+func (mm MockManager) Shutdown() {}

vms/platformvm/vm_test.go

@@ -10,6 +10,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/ava-labs/gecko/chains"
+
 	"github.com/ava-labs/gecko/database/memdb"
 	"github.com/ava-labs/gecko/ids"
 	"github.com/ava-labs/gecko/snow"
@@ -113,7 +115,8 @@ func defaultVM() *VM {
 	}
 
 	vm := &VM{
-		SnowmanVM: &core.SnowmanVM{},
+		SnowmanVM:    &core.SnowmanVM{},
+		ChainManager: chains.MockManager{},
 	}
 
 	defaultSubnet := validators.NewSet()