[refactoring] fix tests

pkg/ast/traverser/dfs.go

@@ -70,6 +70,12 @@ func (t *DFS) Traverse(n ast.Vertex) {
 			return
 		}
 	case *ast.ArgumentList:
+		if nn == nil {
+			return
+		}
+		if !t.visitor.EnterNode(nn) {
+			return
+		}
 		if nn.Arguments != nil {
 			t.visitor.Enter("Arguments", false)
 			for _, c := range nn.Arguments {
@@ -732,6 +738,12 @@ func (t *DFS) Traverse(n ast.Vertex) {
 			return
 		}
 	case *ast.StmtIf:
+		if nn == nil {
+			return
+		}
+		if !t.visitor.EnterNode(nn) {
+			return
+		}
 		if nn.Cond != nil {
 			t.visitor.Enter("Cond", true)
 			t.Traverse(nn.Cond)
@@ -2645,6 +2657,55 @@ func (t *DFS) Traverse(n ast.Vertex) {
 		if !t.visitor.EnterNode(nn) {
 			return
 		}
+	case *ast.NameName:
+		if nn == nil {
+			return
+		}
+		if !t.visitor.EnterNode(nn) {
+			return
+		}
+		if nn.Parts != nil {
+			t.visitor.Enter("Parts", false)
+			for _, c := range nn.Parts {
+				t.Traverse(c)
+			}
+			t.visitor.Leave("Parts", false)
+		}
+	case *ast.NameFullyQualified:
+		if nn == nil {
+			return
+		}
+		if !t.visitor.EnterNode(nn) {
+			return
+		}
+		if nn.Parts != nil {
+			t.visitor.Enter("Parts", false)
+			for _, c := range nn.Parts {
+				t.Traverse(c)
+			}
+			t.visitor.Leave("Parts", false)
+		}
+	case *ast.NameRelative:
+		if nn == nil {
+			return
+		}
+		if !t.visitor.EnterNode(nn) {
+			return
+		}
+		if nn.Parts != nil {
+			t.visitor.Enter("Parts", false)
+			for _, c := range nn.Parts {
+				t.Traverse(c)
+			}
+			t.visitor.Leave("Parts", false)
+		}
+	case *ast.NameNamePart:
+		if nn == nil {
+			return
+		}
+		if !t.visitor.EnterNode(nn) {
+			return
+		}
 	default:
 		panic("unexpected type of node")
 	}

pkg/errors/error_test.go

@@ -5,8 +5,8 @@ import (
 
 	"gotest.tools/assert"
 
-	"github.com/z7zmey/php-parser/errors"
-	"github.com/z7zmey/php-parser/position"
+	"github.com/z7zmey/php-parser/pkg/errors"
+	"github.com/z7zmey/php-parser/pkg/position"
 )
 
 func TestConstructor(t *testing.T) {