diff --git a/querylog/qlog_file_test.go b/querylog/qlog_file_test.go
index 3d6d2600..6ba5780f 100644
--- a/querylog/qlog_file_test.go
+++ b/querylog/qlog_file_test.go
@@ -1,34 +1,38 @@
 package querylog
 
 import (
+	"encoding/binary"
 	"io"
+	"io/ioutil"
+	"net"
 	"os"
 	"strings"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
 )
 
+func TestQLogFileEmpty(t *testing.T) {
+	// TODO: test empty file
+}
+
+func TestQLogFileLarge(t *testing.T) {
+	// TODO: test reading large file
+}
+
+func TestQLogFileSeek(t *testing.T) {
+	// TODO: test seek method on a small file
+}
+
 // Check adding and loading (with filtering) entries from disk and memory
 func TestQLogFile(t *testing.T) {
-	conf := Config{
-		Enabled:  true,
-		Interval: 1,
-		MemSize:  100,
-	}
-	conf.BaseDir = prepareTestDir()
-	defer func() { _ = os.RemoveAll(conf.BaseDir) }()
-	l := newQueryLog(conf)
-
-	// add disk entries
-	addEntry(l, "example.org", "1.2.3.4", "0.1.2.4")
-	addEntry(l, "example.org", "1.2.3.4", "0.1.2.5")
-
-	// write to disk
-	_ = l.flushLogBuffer(true)
+	testDir := prepareTestDir()
+	defer func() { _ = os.RemoveAll(testDir) }()
+	testFile := prepareTestFile(testDir, 2)
 
 	// create the new QLogFile instance
-	q, err := NewQLogFile(l.logFile)
+	q, err := NewQLogFile(testFile)
 	assert.Nil(t, err)
 	assert.NotNil(t, q)
 
@@ -40,7 +44,7 @@ func TestQLogFile(t *testing.T) {
 	// read first line
 	line, err := q.ReadNext()
 	assert.Nil(t, err)
-	assert.True(t, strings.Contains(line, "0.1.2.5"), line)
+	assert.True(t, strings.Contains(line, "0.0.0.2"), line)
 	assert.True(t, strings.HasPrefix(line, "{"), line)
 	assert.True(t, strings.HasSuffix(line, "}"), line)
 
@@ -48,7 +52,7 @@ func TestQLogFile(t *testing.T) {
 	line, err = q.ReadNext()
 	assert.Nil(t, err)
 	assert.Equal(t, int64(0), q.position)
-	assert.True(t, strings.Contains(line, "0.1.2.4"), line)
+	assert.True(t, strings.Contains(line, "0.0.0.1"), line)
 	assert.True(t, strings.HasPrefix(line, "{"), line)
 	assert.True(t, strings.HasSuffix(line, "}"), line)
 
@@ -57,3 +61,30 @@ func TestQLogFile(t *testing.T) {
 	assert.Equal(t, io.EOF, err)
 	assert.Equal(t, "", line)
 }
+
+// prepareTestFile - prepares a test query log file with the specified number of lines
+func prepareTestFile(dir string, linesCount int) string {
+	format := `{"IP":"${IP}","T":"${TIMESTAMP}","QH":"example.org","QT":"A","QC":"IN","Answer":"AAAAAAABAAEAAAAAB2V4YW1wbGUDb3JnAAABAAEHZXhhbXBsZQNvcmcAAAEAAQAAAAAABAECAwQ=","Result":{},"Elapsed":0,"Upstream":"upstream"}`
+
+	lineTime, _ := time.Parse(time.RFC3339Nano, "2020-02-18T22:36:35.920973+03:00")
+	lineIP := uint32(0)
+
+	f, _ := ioutil.TempFile(dir, "*.txt")
+
+	for i := 0; i < linesCount; i++ {
+		lineIP += 1
+		lineTime = lineTime.Add(time.Second)
+
+		ip := make(net.IP, 4)
+		binary.BigEndian.PutUint32(ip, lineIP)
+
+		line := format
+		line = strings.ReplaceAll(line, "${IP}", ip.String())
+		line = strings.ReplaceAll(line, "${TIMESTAMP}", lineTime.Format(time.RFC3339Nano))
+
+		_, _ = f.WriteString(line)
+		_, _ = f.WriteString("\n")
+	}
+
+	return f.Name()
+}