Remove plans/ directory (P0/P1/P2 work complete)

vfs/vfserror/vfserror_test.go

@@ -0,0 +1,31 @@
+package vfserror
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestVFSError(t *testing.T) {
+	t.Parallel()
+	err := NewVFSError("open", "k1", ErrNotFound)
+	if err == nil {
+		t.Fatal("nil error")
+	}
+	if !errors.Is(err, ErrNotFound) {
+		t.Error("should unwrap to ErrNotFound")
+	}
+	if err.Key != "k1" || err.Op != "open" {
+		t.Errorf("bad fields: %+v", err)
+	}
+}
+
+func TestVFSErrorWithSize(t *testing.T) {
+	t.Parallel()
+	err := NewVFSErrorWithSize("create", "big", 12345, ErrCapacityExceeded)
+	if err.Size != 12345 {
+		t.Errorf("size = %d, want 12345", err.Size)
+	}
+	if err.Error() == "" {
+		t.Error("Error() empty")
+	}
+}