squash: remove `TmpFolder.ReadDir` and partially revert querylog test

helpertest/tmpdata.go

@@ -105,13 +105,6 @@ func (tf *TmpFolder) JoinPath(name string) string {
 	return filepath.Join(tf.Path, name)
 }
 
-func (tf *TmpFolder) ReadDir() []fs.DirEntry {
-	files, err := os.ReadDir(tf.Path)
-	Expect(err).Should(Succeed())
-
-	return files
-}
-
 func (tf *TmpFolder) createFile(name string) (*os.File, *TmpFile) {
 	var (
 		f   *os.File

querylog/file_writer_test.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"io/fs"
 	"os"
 	"time"
 
@@ -115,11 +116,15 @@ var _ = Describe("FileWriter", func() {
 					})
 				})
 
-				Expect(tmpDir.ReadDir()).Should(HaveLen(2))
+				Eventually(func(g Gomega) ([]fs.DirEntry, error) {
+					return os.ReadDir(tmpDir.Path)
+				}, "20s", "1s").Should(HaveLen(2))
 
 				writer.CleanUp()
 
-				Expect(tmpDir.ReadDir()).Should(HaveLen(1))
+				Eventually(func(g Gomega) ([]fs.DirEntry, error) {
+					return os.ReadDir(tmpDir.Path)
+				}, "20s", "1s").Should(HaveLen(1))
 			})
 		})
 	})